Add initial nu-test-support port (#913)

* Add initial nu-test-support port * finish changing binary name * Oops, these aren't Windows-safe tests
2024-11-24 17:34:00 +01:00 · 2022-02-02 15:59:01 -05:00 · 2022-02-02 15:59:01 -05:00 · cc1b784e3d
commit cc1b784e3d
parent cbdc0e2010
169 changed files with 7276 additions and 56 deletions
--- a/Cargo.lock
+++ b/Cargo.lock
@ -246,6 +246,18 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "904dfeac50f3cdaba28fc6f57fdcddb75f49ed61346676a78c4ffe55877802fd"

+[[package]]
+name = "bigdecimal"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6aaf33151a6429fe9211d1b276eafdf70cdff28b071e76c0b0e1503221ea3744"
+dependencies = [
+ "num-bigint 0.4.3",
+ "num-integer",
+ "num-traits",
+ "serde",
+]
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@ -908,40 +920,6 @@ dependencies = [
 "cfg-if",
 ]

-[[package]]
-name = "engine-q"
-version = "0.1.0"
-dependencies = [
- "assert_cmd",
- "crossterm",
- "crossterm_winapi",
- "ctrlc",
- "log",
- "miette",
- "nu-ansi-term",
- "nu-cli",
- "nu-color-config",
- "nu-command",
- "nu-engine",
- "nu-json",
- "nu-parser",
- "nu-path",
- "nu-plugin",
- "nu-pretty-hex",
- "nu-protocol",
- "nu-system",
- "nu-table",
- "nu-term-grid",
- "nu_plugin_example",
- "nu_plugin_gstat",
- "nu_plugin_inc",
- "nu_plugin_query",
- "pretty_assertions",
- "pretty_env_logger",
- "reedline",
- "tempfile",
-]
-
 [[package]]
 name = "env_logger"
 version = "0.7.1"
@ -955,6 +933,16 @@ dependencies = [
 "termcolor",
 ]

+[[package]]
+name = "env_logger"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a19187fea3ac7e84da7dacf48de0c45d63c6a76f9490dae389aead16c243fce3"
+dependencies = [
+ "log",
+ "regex",
+]
+
 [[package]]
 name = "erased-serde"
 version = "0.3.16"
@ -1212,6 +1200,18 @@ dependencies = [
 "wasi 0.10.0+wasi-snapshot-preview1",
 ]

+[[package]]
+name = "getset"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e45727250e75cc04ff2846a66397da8ef2b3db8e40e0cef4df67950a07621eb9"
+dependencies = [
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "ghost"
 version = "0.1.2"
@ -1275,6 +1275,16 @@ dependencies = [
 "tracing",
 ]

+[[package]]
+name = "hamcrest2"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49f837c62de05dc9cc71ff6486cd85de8856a330395ae338a04bfcefe5e91075"
+dependencies = [
+ "num 0.2.1",
+ "regex",
+]
+
 [[package]]
 name = "hash32"
 version = "0.1.1"
@ -2020,6 +2030,45 @@ dependencies = [
 "winapi",
 ]

+[[package]]
+name = "nu"
+version = "0.1.0"
+dependencies = [
+ "assert_cmd",
+ "crossterm",
+ "crossterm_winapi",
+ "ctrlc",
+ "hamcrest2",
+ "itertools",
+ "log",
+ "miette",
+ "nu-ansi-term",
+ "nu-cli",
+ "nu-color-config",
+ "nu-command",
+ "nu-engine",
+ "nu-json",
+ "nu-parser",
+ "nu-path",
+ "nu-plugin",
+ "nu-pretty-hex",
+ "nu-protocol",
+ "nu-system",
+ "nu-table",
+ "nu-term-grid",
+ "nu-test-support",
+ "nu_plugin_example",
+ "nu_plugin_gstat",
+ "nu_plugin_inc",
+ "nu_plugin_query",
+ "pretty_assertions",
+ "pretty_env_logger",
+ "reedline",
+ "rstest",
+ "serial_test",
+ "tempfile",
+]
+
 [[package]]
 name = "nu-ansi-term"
 version = "0.42.0"
@ -2073,10 +2122,12 @@ dependencies = [
 "csv",
 "dialoguer",
 "digest 0.10.0",
+ "dirs-next",
 "dtparse",
 "eml-parser",
 "encoding_rs",
 "glob",
+ "hamcrest2",
 "htmlescape",
 "ical",
 "indexmap",
@ -2098,10 +2149,13 @@ dependencies = [
 "nu-system",
 "nu-table",
 "nu-term-grid",
+ "nu-test-support",
 "num 0.4.0",
 "pathdiff",
 "polars",
 "quick-xml 0.22.0",
+ "quickcheck",
+ "quickcheck_macros",
 "rand 0.8.4",
 "rayon",
 "regex",
@ -2251,6 +2305,22 @@ dependencies = [
 "unicode-width",
 ]

+[[package]]
+name = "nu-test-support"
+version = "0.43.0"
+dependencies = [
+ "bigdecimal",
+ "chrono",
+ "getset",
+ "glob",
+ "hamcrest2",
+ "indexmap",
+ "nu-path",
+ "nu-protocol",
+ "num-bigint 0.4.3",
+ "tempfile",
+]
+
 [[package]]
 name = "nu_plugin_example"
 version = "0.1.0"
@ -2339,6 +2409,7 @@ dependencies = [
 "autocfg",
 "num-integer",
 "num-traits",
+ "serde",
 ]

 [[package]]
@ -2875,7 +2946,7 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "926d36b9553851b8b0005f1275891b392ee4d2d833852c417ed025477350fb9d"
 dependencies = [
- "env_logger",
+ "env_logger 0.7.1",
 "log",
 ]

@ -2893,6 +2964,30 @@ dependencies = [
 "unicode-width",
 ]

+[[package]]
+name = "proc-macro-error"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
+dependencies = [
+ "proc-macro-error-attr",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "version_check 0.9.3",
+]
+
+[[package]]
+name = "proc-macro-error-attr"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "version_check 0.9.3",
+]
+
 [[package]]
 name = "proc-macro-hack"
 version = "0.5.19"
@ -2948,6 +3043,28 @@ dependencies = [
 "memchr",
 ]

+[[package]]
+name = "quickcheck"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "588f6378e4dd99458b60ec275b4477add41ce4fa9f64dcba6f15adccb19b50d6"
+dependencies = [
+ "env_logger 0.8.4",
+ "log",
+ "rand 0.8.4",
+]
+
+[[package]]
+name = "quickcheck_macros"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b22a693222d716a9587786f37ac3f6b4faedb5b80c23914e7303ff5a1d8016e9"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "quote"
 version = "1.0.10"
@ -3224,6 +3341,19 @@ dependencies = [
 "xmlparser",
 ]

+[[package]]
+name = "rstest"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d912f35156a3f99a66ee3e11ac2e0b3f34ac85a07e05263d05a7e2c8810d616f"
+dependencies = [
+ "cfg-if",
+ "proc-macro2",
+ "quote",
+ "rustc_version",
+ "syn",
+]
+
 [[package]]
 name = "rust-argon2"
 version = "0.8.3"
@ -3487,6 +3617,28 @@ dependencies = [
 "yaml-rust",
 ]

+[[package]]
+name = "serial_test"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e0bccbcf40c8938196944a3da0e133e031a33f4d6b72db3bda3cc556e361905d"
+dependencies = [
+ "lazy_static",
+ "parking_lot",
+ "serial_test_derive",
+]
+
+[[package]]
+name = "serial_test_derive"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2acd6defeddb41eb60bb468f8825d0cfd0c2a76bc03bfd235b6a1dc4f6a1ad5"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "servo_arc"
 version = "0.1.1"
--- a/Cargo.toml
+++ b/Cargo.toml
@ -1,8 +1,8 @@
 [package]
-name = "engine-q"
+name = "nu"
 version = "0.1.0"
 edition = "2021"
-default-run = "engine-q"
+default-run = "nu"

 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

@ -36,6 +36,7 @@ nu-plugin = { path = "./crates/nu-plugin", optional = true }
 nu-system = { path = "./crates/nu-system"}
 nu-table = { path = "./crates/nu-table" }
 nu-term-grid = { path = "./crates/nu-term-grid" }
+
 nu-ansi-term = "0.42.0"
 nu-color-config = { path = "./crates/nu-color-config" }
 miette = "3.0.0"
@ -52,11 +53,14 @@ nu_plugin_gstat = { version = "0.1.0", path = "./crates/nu_plugin_gstat", option
 nu_plugin_query = { version = "0.1.0", path = "./crates/nu_plugin_query", optional = true }

 [dev-dependencies]
+nu-test-support = { path="./crates/nu-test-support" }
 tempfile = "3.2.0"
 assert_cmd = "2.0.2"
 pretty_assertions = "1.0.0"
-
-[build-dependencies]
+serial_test = "0.5.1"
+hamcrest2 = "0.3.0"
+rstest = "0.12.0"
+itertools = "0.10.3"

 [features]
 plugin = ["nu-plugin", "nu-parser/plugin", "nu-command/plugin", "nu-protocol/plugin", "nu-engine/plugin"]
@ -119,5 +123,5 @@ required-features = ["query"]

 # Main nu binary
 [[bin]]
-name = "engine-q"
+name = "nu"
 path = "src/main.rs"
--- a/crates/nu-command/Cargo.toml
+++ b/crates/nu-command/Cargo.toml
@ -15,6 +15,7 @@ nu-pretty-hex = { path = "../nu-pretty-hex" }
 nu-protocol = { path = "../nu-protocol" }
 nu-table = { path = "../nu-table" }
 nu-term-grid = { path = "../nu-term-grid" }
+nu-test-support = { path = "../nu-test-support" }
 nu-parser = { path = "../nu-parser" }
 nu-system = { path = "../nu-system" }
 # nu-ansi-term = { path = "../nu-ansi-term" }
@ -95,3 +96,9 @@ dataframe = ["polars", "num"]

 [build-dependencies]
 shadow-rs = "0.8.1"
+
+[dev-dependencies]
+hamcrest2 = "0.3.0"
+dirs-next = "2.0.0"
+quickcheck = "1.0.3"
+quickcheck_macros = "1.0.0"
--- a/crates/nu-engine/src/eval.rs
+++ b/crates/nu-engine/src/eval.rs
@ -1028,13 +1028,25 @@ fn compute(size: i64, unit: Unit, span: Span) -> Value {
            val: size * 1000 * 1000 * 1000 * 60 * 60,
            span,
        },
-        Unit::Day => Value::Duration {
-            val: size * 1000 * 1000 * 1000 * 60 * 60 * 24,
-            span,
+        Unit::Day => match size.checked_mul(1000 * 1000 * 1000 * 60 * 60 * 24) {
+            Some(val) => Value::Duration { val, span },
+            None => Value::Error {
+                error: ShellError::SpannedLabeledError(
+                    "duration too large".into(),
+                    "duration too large".into(),
+                    span,
+                ),
+            },
        },
-        Unit::Week => Value::Duration {
-            val: size * 1000 * 1000 * 1000 * 60 * 60 * 24 * 7,
-            span,
+        Unit::Week => match size.checked_mul(1000 * 1000 * 1000 * 60 * 60 * 24 * 7) {
+            Some(val) => Value::Duration { val, span },
+            None => Value::Error {
+                error: ShellError::SpannedLabeledError(
+                    "duration too large".into(),
+                    "duration too large".into(),
+                    span,
+                ),
+            },
        },
    }
 }
--- a/crates/nu-parser/src/type_check.rs
+++ b/crates/nu-parser/src/type_check.rs
@ -88,7 +88,34 @@ pub fn math_result_type(
                    )
                }
            },
-            Operator::Multiply | Operator::Pow => match (&lhs.ty, &rhs.ty) {
+            Operator::Multiply => match (&lhs.ty, &rhs.ty) {
+                (Type::Int, Type::Int) => (Type::Int, None),
+                (Type::Float, Type::Int) => (Type::Float, None),
+                (Type::Int, Type::Float) => (Type::Float, None),
+                (Type::Float, Type::Float) => (Type::Float, None),
+
+                (Type::Filesize, Type::Int) => (Type::Filesize, None),
+                (Type::Int, Type::Filesize) => (Type::Filesize, None),
+                (Type::Duration, Type::Int) => (Type::Filesize, None),
+                (Type::Int, Type::Duration) => (Type::Filesize, None),
+
+                (Type::Unknown, _) => (Type::Unknown, None),
+                (_, Type::Unknown) => (Type::Unknown, None),
+                _ => {
+                    *op = Expression::garbage(op.span);
+                    (
+                        Type::Unknown,
+                        Some(ParseError::UnsupportedOperation(
+                            op.span,
+                            lhs.span,
+                            lhs.ty.clone(),
+                            rhs.span,
+                            rhs.ty.clone(),
+                        )),
+                    )
+                }
+            },
+            Operator::Pow => match (&lhs.ty, &rhs.ty) {
                (Type::Int, Type::Int) => (Type::Int, None),
                (Type::Float, Type::Int) => (Type::Float, None),
                (Type::Int, Type::Float) => (Type::Float, None),
@ -118,6 +145,9 @@ pub fn math_result_type(
                (Type::Filesize, Type::Filesize) => (Type::Float, None),
                (Type::Duration, Type::Duration) => (Type::Float, None),

+                (Type::Filesize, Type::Int) => (Type::Filesize, None),
+                (Type::Duration, Type::Int) => (Type::Duration, None),
+
                (Type::Unknown, _) => (Type::Unknown, None),
                (_, Type::Unknown) => (Type::Unknown, None),
                _ => {
--- a/crates/nu-protocol/src/engine/command.rs
+++ b/crates/nu-protocol/src/engine/command.rs
@ -7,9 +7,7 @@ use super::{EngineState, Stack};
 pub trait Command: Send + Sync + CommandClone {
    fn name(&self) -> &str;

-    fn signature(&self) -> Signature {
-        Signature::new(self.name()).desc(self.usage()).filter()
-    }
+    fn signature(&self) -> Signature;

    fn usage(&self) -> &str;

--- a/crates/nu-protocol/src/value/mod.rs
+++ b/crates/nu-protocol/src/value/mod.rs
@ -1122,6 +1122,30 @@ impl Value {
                val: lhs * rhs,
                span,
            }),
+            (Value::Int { val: lhs, .. }, Value::Filesize { val: rhs, .. }) => {
+                Ok(Value::Filesize {
+                    val: *lhs * *rhs,
+                    span,
+                })
+            }
+            (Value::Filesize { val: lhs, .. }, Value::Int { val: rhs, .. }) => {
+                Ok(Value::Filesize {
+                    val: *lhs * *rhs,
+                    span,
+                })
+            }
+            (Value::Int { val: lhs, .. }, Value::Duration { val: rhs, .. }) => {
+                Ok(Value::Duration {
+                    val: *lhs * *rhs,
+                    span,
+                })
+            }
+            (Value::Duration { val: lhs, .. }, Value::Int { val: rhs, .. }) => {
+                Ok(Value::Duration {
+                    val: *lhs * *rhs,
+                    span,
+                })
+            }
            (Value::CustomValue { val: lhs, span }, rhs) => {
                lhs.operation(*span, Operator::Multiply, op, rhs)
            }
@ -1220,6 +1244,26 @@ impl Value {
                    Err(ShellError::DivisionByZero(op))
                }
            }
+            (Value::Filesize { val: lhs, .. }, Value::Int { val: rhs, .. }) => {
+                if *rhs != 0 {
+                    Ok(Value::Filesize {
+                        val: lhs / rhs,
+                        span,
+                    })
+                } else {
+                    Err(ShellError::DivisionByZero(op))
+                }
+            }
+            (Value::Duration { val: lhs, .. }, Value::Int { val: rhs, .. }) => {
+                if *rhs != 0 {
+                    Ok(Value::Duration {
+                        val: lhs / rhs,
+                        span,
+                    })
+                } else {
+                    Err(ShellError::DivisionByZero(op))
+                }
+            }
            (Value::CustomValue { val: lhs, span }, rhs) => {
                lhs.operation(*span, Operator::Divide, op, rhs)
            }
--- a/crates/nu-test-support/Cargo.toml
+++ b/crates/nu-test-support/Cargo.toml
@ -0,0 +1,23 @@
+[package]
+authors = ["The Nu Project Contributors"]
+description = "Support for writing Nushell tests"
+edition = "2018"
+license = "MIT"
+name = "nu-test-support"
+version = "0.43.0"
+
+[lib]
+doctest = false
+
+[dependencies]
+nu-path = { path="../nu-path" }
+nu-protocol = { path="../nu-protocol" }
+
+bigdecimal = { package = "bigdecimal", version = "0.3.0", features = ["serde"] }
+chrono = "0.4.19"
+getset = "0.1.1"
+glob = "0.3.0"
+indexmap = { version="1.6.1", features=["serde-1"] }
+num-bigint = { version="0.4.3", features=["serde"] }
+tempfile = "3.2.0"
+hamcrest2 = "0.3.0"
--- a/crates/nu-test-support/src/commands.rs
+++ b/crates/nu-test-support/src/commands.rs
@ -0,0 +1,53 @@
+// use nu_protocol::{
+//     ast::{Expr, Expression},
+//     Span, Spanned, Type,
+// };
+
+// pub struct ExternalBuilder {
+//     name: String,
+//     args: Vec<String>,
+// }
+
+// impl ExternalBuilder {
+//     pub fn for_name(name: &str) -> ExternalBuilder {
+//         ExternalBuilder {
+//             name: name.to_string(),
+//             args: vec![],
+//         }
+//     }
+
+//     pub fn arg(&mut self, value: &str) -> &mut Self {
+//         self.args.push(value.to_string());
+//         self
+//     }
+
+// pub fn build(&mut self) -> ExternalCommand {
+//     let mut path = crate::fs::binaries();
+//     path.push(&self.name);
+
+//     let name = Spanned {
+//         item: path.to_string_lossy().to_string(),
+//         span: Span::new(0, 0),
+//     };
+
+//     let args = self
+//         .args
+//         .iter()
+//         .map(|arg| Expression {
+//             expr: Expr::String(arg.to_string()),
+//             span: Span::new(0, 0),
+//             ty: Type::Unknown,
+//             custom_completion: None,
+//         })
+//         .collect::<Vec<_>>();
+
+//     ExternalCommand {
+//         name: name.to_string(),
+//         name_tag: Tag::unknown(),
+//         args: ExternalArgs {
+//             list: args,
+//             span: name.span,
+//         },
+//     }
+// }
+// }
--- a/crates/nu-test-support/src/fs.rs
+++ b/crates/nu-test-support/src/fs.rs
@ -0,0 +1,277 @@
+use std::io::Read;
+use std::ops::Div;
+use std::path::{Path, PathBuf};
+
+pub struct AbsoluteFile {
+    inner: PathBuf,
+}
+
+impl AbsoluteFile {
+    pub fn new(path: impl AsRef<Path>) -> AbsoluteFile {
+        let path = path.as_ref();
+
+        if !path.is_absolute() {
+            panic!(
+                "AbsoluteFile::new must take an absolute path :: {}",
+                path.display()
+            )
+        } else if path.is_dir() {
+            // At the moment, this is not an invariant, but rather a way to catch bugs
+            // in tests.
+            panic!(
+                "AbsoluteFile::new must not take a directory :: {}",
+                path.display()
+            )
+        } else {
+            AbsoluteFile {
+                inner: path.to_path_buf(),
+            }
+        }
+    }
+
+    pub fn dir(&self) -> AbsolutePath {
+        AbsolutePath::new(if let Some(parent) = self.inner.parent() {
+            parent
+        } else {
+            unreachable!("Internal error: could not get parent in dir")
+        })
+    }
+}
+
+impl From<AbsoluteFile> for PathBuf {
+    fn from(file: AbsoluteFile) -> Self {
+        file.inner
+    }
+}
+
+pub struct AbsolutePath {
+    pub inner: PathBuf,
+}
+
+impl AbsolutePath {
+    pub fn new(path: impl AsRef<Path>) -> AbsolutePath {
+        let path = path.as_ref();
+
+        if path.is_absolute() {
+            AbsolutePath {
+                inner: path.to_path_buf(),
+            }
+        } else {
+            panic!("AbsolutePath::new must take an absolute path")
+        }
+    }
+}
+
+impl Div<&str> for &AbsolutePath {
+    type Output = AbsolutePath;
+
+    fn div(self, rhs: &str) -> Self::Output {
+        let parts = rhs.split('/');
+        let mut result = self.inner.clone();
+
+        for part in parts {
+            result = result.join(part);
+        }
+
+        AbsolutePath::new(result)
+    }
+}
+
+impl AsRef<Path> for AbsolutePath {
+    fn as_ref(&self) -> &Path {
+        self.inner.as_path()
+    }
+}
+
+pub struct RelativePath {
+    inner: PathBuf,
+}
+
+impl RelativePath {
+    pub fn new(path: impl Into<PathBuf>) -> RelativePath {
+        let path = path.into();
+
+        if path.is_relative() {
+            RelativePath { inner: path }
+        } else {
+            panic!("RelativePath::new must take a relative path")
+        }
+    }
+}
+
+impl<T: AsRef<str>> Div<T> for &RelativePath {
+    type Output = RelativePath;
+
+    fn div(self, rhs: T) -> Self::Output {
+        let parts = rhs.as_ref().split('/');
+        let mut result = self.inner.clone();
+
+        for part in parts {
+            result = result.join(part);
+        }
+
+        RelativePath::new(result)
+    }
+}
+pub trait DisplayPath {
+    fn display_path(&self) -> String;
+}
+
+impl DisplayPath for AbsolutePath {
+    fn display_path(&self) -> String {
+        self.inner.display().to_string()
+    }
+}
+
+impl DisplayPath for PathBuf {
+    fn display_path(&self) -> String {
+        self.display().to_string()
+    }
+}
+
+impl DisplayPath for str {
+    fn display_path(&self) -> String {
+        self.to_string()
+    }
+}
+
+impl DisplayPath for &str {
+    fn display_path(&self) -> String {
+        (*self).to_string()
+    }
+}
+
+impl DisplayPath for String {
+    fn display_path(&self) -> String {
+        self.clone()
+    }
+}
+
+impl DisplayPath for &String {
+    fn display_path(&self) -> String {
+        (*self).to_string()
+    }
+}
+pub enum Stub<'a> {
+    FileWithContent(&'a str, &'a str),
+    FileWithContentToBeTrimmed(&'a str, &'a str),
+    EmptyFile(&'a str),
+}
+
+pub fn file_contents(full_path: impl AsRef<Path>) -> String {
+    let mut file = std::fs::File::open(full_path.as_ref()).expect("can not open file");
+    let mut contents = String::new();
+    file.read_to_string(&mut contents)
+        .expect("can not read file");
+    contents
+}
+
+pub fn file_contents_binary(full_path: impl AsRef<Path>) -> Vec<u8> {
+    let mut file = std::fs::File::open(full_path.as_ref()).expect("can not open file");
+    let mut contents = Vec::new();
+    file.read_to_end(&mut contents).expect("can not read file");
+    contents
+}
+
+pub fn line_ending() -> String {
+    #[cfg(windows)]
+    {
+        String::from("\r\n")
+    }
+
+    #[cfg(not(windows))]
+    {
+        String::from("\n")
+    }
+}
+
+pub fn delete_file_at(full_path: impl AsRef<Path>) {
+    let full_path = full_path.as_ref();
+
+    if full_path.exists() {
+        std::fs::remove_file(full_path).expect("can not delete file");
+    }
+}
+
+pub fn create_file_at(full_path: impl AsRef<Path>) -> Result<(), std::io::Error> {
+    let full_path = full_path.as_ref();
+
+    if full_path.parent().is_some() {
+        panic!("path exists");
+    }
+
+    std::fs::write(full_path, b"fake data")
+}
+
+pub fn copy_file_to(source: &str, destination: &str) {
+    std::fs::copy(source, destination).expect("can not copy file");
+}
+
+pub fn files_exist_at(files: Vec<impl AsRef<Path>>, path: impl AsRef<Path>) -> bool {
+    files.iter().all(|f| {
+        let mut loc = PathBuf::from(path.as_ref());
+        loc.push(f);
+        loc.exists()
+    })
+}
+
+pub fn delete_directory_at(full_path: &str) {
+    std::fs::remove_dir_all(PathBuf::from(full_path)).expect("can not remove directory");
+}
+
+pub fn executable_path() -> PathBuf {
+    let mut path = binaries();
+    path.push("nu");
+    path
+}
+
+pub fn root() -> PathBuf {
+    let manifest_dir = if let Ok(manifest_dir) = std::env::var("CARGO_MANIFEST_DIR") {
+        PathBuf::from(manifest_dir)
+    } else {
+        PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+    };
+
+    let test_path = manifest_dir.join("Cargo.lock");
+    if test_path.exists() {
+        manifest_dir
+    } else {
+        manifest_dir
+            .parent()
+            .expect("Couldn't find the debug binaries directory")
+            .parent()
+            .expect("Couldn't find the debug binaries directory")
+            .to_path_buf()
+    }
+}
+
+pub fn binaries() -> PathBuf {
+    let mut build_type = "debug";
+    if !cfg!(debug_assertions) {
+        build_type = "release"
+    }
+
+    std::env::var("CARGO_TARGET_DIR")
+        .ok()
+        .map(|target_dir| PathBuf::from(target_dir).join(&build_type))
+        .unwrap_or_else(|| root().join(format!("target/{}", &build_type)))
+}
+
+pub fn fixtures() -> PathBuf {
+    root().join("tests/fixtures")
+}
+
+pub fn assets() -> PathBuf {
+    root().join("tests/assets")
+}
+
+pub fn in_directory(str: impl AsRef<Path>) -> String {
+    let path = str.as_ref();
+    let path = if path.is_relative() {
+        root().join(path)
+    } else {
+        path.to_path_buf()
+    };
+
+    path.display().to_string()
+}
--- a/crates/nu-test-support/src/lib.rs
+++ b/crates/nu-test-support/src/lib.rs
@ -0,0 +1,70 @@
+pub mod commands;
+pub mod fs;
+pub mod macros;
+pub mod playground;
+
+pub struct Outcome {
+    pub out: String,
+    pub err: String,
+}
+
+#[cfg(windows)]
+pub const NATIVE_PATH_ENV_VAR: &str = "Path";
+#[cfg(not(windows))]
+pub const NATIVE_PATH_ENV_VAR: &str = "PATH";
+
+#[cfg(windows)]
+pub const NATIVE_PATH_ENV_SEPARATOR: char = ';';
+#[cfg(not(windows))]
+pub const NATIVE_PATH_ENV_SEPARATOR: char = ':';
+
+impl Outcome {
+    pub fn new(out: String, err: String) -> Outcome {
+        Outcome { out, err }
+    }
+}
+
+pub fn pipeline(commands: &str) -> String {
+    commands
+        .lines()
+        .skip(1)
+        .map(|line| line.trim())
+        .collect::<Vec<&str>>()
+        .join(" ")
+        .trim_end()
+        .to_string()
+}
+
+pub fn shell_os_paths() -> Vec<std::path::PathBuf> {
+    let mut original_paths = vec![];
+
+    if let Some(paths) = std::env::var_os(NATIVE_PATH_ENV_VAR) {
+        original_paths = std::env::split_paths(&paths).collect::<Vec<_>>();
+    }
+
+    original_paths
+}
+
+#[cfg(test)]
+mod tests {
+    use super::pipeline;
+
+    #[test]
+    fn constructs_a_pipeline() {
+        let actual = pipeline(
+            r#"
+                open los_tres_amigos.txt
+                | from-csv
+                | get rusty_luck
+                | str to-int
+                | math sum
+                | echo "$it"
+            "#,
+        );
+
+        assert_eq!(
+            actual,
+            r#"open los_tres_amigos.txt | from-csv | get rusty_luck | str to-int | math sum | echo "$it""#
+        );
+    }
+}
--- a/crates/nu-test-support/src/macros.rs
+++ b/crates/nu-test-support/src/macros.rs
@ -0,0 +1,170 @@
+#[macro_export]
+macro_rules! nu {
+    (cwd: $cwd:expr, $path:expr, $($part:expr),*) => {{
+        use $crate::fs::DisplayPath;
+
+        let path = format!($path, $(
+            $part.display_path()
+        ),*);
+
+        nu!($cwd, &path)
+    }};
+
+    (cwd: $cwd:expr, $path:expr) => {{
+        nu!($cwd, $path)
+    }};
+
+    ($cwd:expr, $path:expr) => {{
+        pub use itertools::Itertools;
+        pub use std::error::Error;
+        pub use std::io::prelude::*;
+        pub use std::process::{Command, Stdio};
+        pub use $crate::NATIVE_PATH_ENV_VAR;
+
+        // let commands = &*format!(
+        //     "
+        //                     cd \"{}\"
+        //                     {}
+        //                     exit",
+        //     $crate::fs::in_directory($cwd),
+        //     $crate::fs::DisplayPath::display_path(&$path)
+        // );
+
+        let test_bins = $crate::fs::binaries();
+
+        let cwd = std::env::current_dir().expect("Could not get current working directory.");
+        let test_bins = nu_path::canonicalize_with(&test_bins, cwd).unwrap_or_else(|e| {
+            panic!(
+                "Couldn't canonicalize dummy binaries path {}: {:?}",
+                test_bins.display(),
+                e
+            )
+        });
+
+        let mut paths = $crate::shell_os_paths();
+        paths.insert(0, test_bins);
+
+        let path = $path.lines().collect::<Vec<_>>().join("; ");
+
+        let paths_joined = match std::env::join_paths(paths) {
+            Ok(all) => all,
+            Err(_) => panic!("Couldn't join paths for PATH var."),
+        };
+
+        let mut process = match Command::new($crate::fs::executable_path())
+            .env(NATIVE_PATH_ENV_VAR, paths_joined)
+            // .arg("--skip-plugins")
+            // .arg("--no-history")
+            // .arg("--config-file")
+            // .arg($crate::fs::DisplayPath::display_path(&$crate::fs::fixtures().join("playground/config/default.toml")))
+            .arg(format!("-c 'cd {}; {}'", $crate::fs::in_directory($cwd), $crate::fs::DisplayPath::display_path(&path)))
+            .stdout(Stdio::piped())
+            // .stdin(Stdio::piped())
+            .stderr(Stdio::piped())
+            .spawn()
+        {
+            Ok(child) => child,
+            Err(why) => panic!("Can't run test {:?} {}", $crate::fs::executable_path(), why.to_string()),
+        };
+
+        // let stdin = process.stdin.as_mut().expect("couldn't open stdin");
+        // stdin
+        //     .write_all(b"exit\n")
+        //     .expect("couldn't write to stdin");
+
+        let output = process
+            .wait_with_output()
+            .expect("couldn't read from stdout/stderr");
+
+        let out = $crate::macros::read_std(&output.stdout);
+        let err = String::from_utf8_lossy(&output.stderr);
+
+            println!("=== stderr\n{}", err);
+
+        $crate::Outcome::new(out,err.into_owned())
+    }};
+}
+
+#[macro_export]
+macro_rules! nu_with_plugins {
+    (cwd: $cwd:expr, $path:expr, $($part:expr),*) => {{
+        use $crate::fs::DisplayPath;
+
+        let path = format!($path, $(
+            $part.display_path()
+        ),*);
+
+        nu_with_plugins!($cwd, &path)
+    }};
+
+    (cwd: $cwd:expr, $path:expr) => {{
+        nu_with_plugins!($cwd, $path)
+    }};
+
+    ($cwd:expr, $path:expr) => {{
+        pub use std::error::Error;
+        pub use std::io::prelude::*;
+        pub use std::process::{Command, Stdio};
+        pub use crate::NATIVE_PATH_ENV_VAR;
+
+        let commands = &*format!(
+            "
+                            cd \"{}\"
+                            {}
+                            exit",
+            $crate::fs::in_directory($cwd),
+            $crate::fs::DisplayPath::display_path(&$path)
+        );
+
+        let test_bins = $crate::fs::binaries();
+        let test_bins = nu_path::canonicalize(&test_bins).unwrap_or_else(|e| {
+            panic!(
+                "Couldn't canonicalize dummy binaries path {}: {:?}",
+                test_bins.display(),
+                e
+            )
+        });
+
+        let mut paths = $crate::shell_os_paths();
+        paths.insert(0, test_bins);
+
+        let paths_joined = match std::env::join_paths(paths) {
+            Ok(all) => all,
+            Err(_) => panic!("Couldn't join paths for PATH var."),
+        };
+
+        let mut process = match Command::new($crate::fs::executable_path())
+            .env(NATIVE_PATH_ENV_VAR, paths_joined)
+            .stdout(Stdio::piped())
+            .stdin(Stdio::piped())
+            .stderr(Stdio::piped())
+            .spawn()
+        {
+            Ok(child) => child,
+            Err(why) => panic!("Can't run test {}", why.to_string()),
+        };
+
+        let stdin = process.stdin.as_mut().expect("couldn't open stdin");
+        stdin
+            .write_all(commands.as_bytes())
+            .expect("couldn't write to stdin");
+
+        let output = process
+            .wait_with_output()
+            .expect("couldn't read from stdout/stderr");
+
+        let out = $crate::macros::read_std(&output.stdout);
+        let err = String::from_utf8_lossy(&output.stderr);
+
+            println!("=== stderr\n{}", err);
+
+        $crate::Outcome::new(out,err.into_owned())
+    }};
+}
+
+pub fn read_std(std: &[u8]) -> String {
+    let out = String::from_utf8_lossy(std);
+    let out = out.lines().collect::<Vec<_>>().join("\n");
+    let out = out.replace("\r\n", "");
+    out.replace("\n", "")
+}
--- a/crates/nu-test-support/src/playground.rs
+++ b/crates/nu-test-support/src/playground.rs
@ -0,0 +1,12 @@
+mod director;
+pub mod matchers;
+pub mod nu_process;
+mod play;
+
+#[cfg(test)]
+mod tests;
+
+pub use director::Director;
+pub use matchers::says;
+pub use nu_process::{Executable, NuProcess, NuResult, Outcome};
+pub use play::{Dirs, EnvironmentVariable, Playground};
--- a/crates/nu-test-support/src/playground/director.rs
+++ b/crates/nu-test-support/src/playground/director.rs
@ -0,0 +1,163 @@
+use super::nu_process::*;
+use super::EnvironmentVariable;
+use std::ffi::OsString;
+use std::fmt;
+
+#[derive(Default, Debug)]
+pub struct Director {
+    pub cwd: Option<OsString>,
+    pub environment_vars: Vec<EnvironmentVariable>,
+    pub config: Option<OsString>,
+    pub pipeline: Option<Vec<String>>,
+    pub executable: Option<NuProcess>,
+}
+
+impl Director {
+    pub fn cococo(&self, arg: &str) -> Self {
+        let mut process = NuProcess {
+            environment_vars: self.environment_vars.clone(),
+            ..Default::default()
+        };
+
+        process.args(&["--testbin", "cococo", arg]);
+        Director {
+            config: self.config.clone(),
+            executable: Some(process),
+            environment_vars: self.environment_vars.clone(),
+            ..Default::default()
+        }
+    }
+
+    pub fn and_then(&mut self, commands: &str) -> &mut Self {
+        let commands = commands.to_string();
+
+        if let Some(ref mut pipeline) = self.pipeline {
+            pipeline.push(commands);
+        } else {
+            self.pipeline = Some(vec![commands]);
+        }
+
+        self
+    }
+
+    pub fn pipeline(&self, commands: &str) -> Self {
+        let mut director = Director {
+            pipeline: if commands.is_empty() {
+                None
+            } else {
+                Some(vec![commands.to_string()])
+            },
+            ..Default::default()
+        };
+
+        let mut process = NuProcess {
+            environment_vars: self.environment_vars.clone(),
+            ..Default::default()
+        };
+
+        if let Some(working_directory) = &self.cwd {
+            process.cwd(working_directory);
+        }
+
+        process.arg("--skip-plugins");
+        process.arg("--no-history");
+        if let Some(config_file) = self.config.as_ref() {
+            process.args(&[
+                "--config-file",
+                config_file.to_str().expect("failed to convert."),
+            ]);
+        }
+        process.arg("--perf");
+
+        director.executable = Some(process);
+        director
+    }
+
+    pub fn executable(&self) -> Option<&NuProcess> {
+        if let Some(binary) = &self.executable {
+            Some(binary)
+        } else {
+            None
+        }
+    }
+}
+
+impl Executable for Director {
+    fn execute(&mut self) -> NuResult {
+        use std::io::Write;
+        use std::process::Stdio;
+
+        match self.executable() {
+            Some(binary) => {
+                let mut process = match binary
+                    .construct()
+                    .stdout(Stdio::piped())
+                    .stdin(Stdio::piped())
+                    .stderr(Stdio::piped())
+                    .spawn()
+                {
+                    Ok(child) => child,
+                    Err(why) => panic!("Can't run test {}", why),
+                };
+
+                if let Some(pipelines) = &self.pipeline {
+                    let child = process.stdin.as_mut().expect("Failed to open stdin");
+
+                    for pipeline in pipelines {
+                        child
+                            .write_all(format!("{}\n", pipeline).as_bytes())
+                            .expect("Could not write to");
+                    }
+
+                    child.write_all(b"exit\n").expect("Could not write to");
+                }
+
+                process
+                    .wait_with_output()
+                    .map_err(|_| {
+                        let reason = format!(
+                            "could not execute process {} ({})",
+                            binary, "No execution took place"
+                        );
+
+                        NuError {
+                            desc: reason,
+                            exit: None,
+                            output: None,
+                        }
+                    })
+                    .and_then(|process| {
+                        let out =
+                            Outcome::new(&read_std(&process.stdout), &read_std(&process.stderr));
+
+                        match process.status.success() {
+                            true => Ok(out),
+                            false => Err(NuError {
+                                desc: String::new(),
+                                exit: Some(process.status),
+                                output: Some(out),
+                            }),
+                        }
+                    })
+            }
+            None => Err(NuError {
+                desc: String::from("err"),
+                exit: None,
+                output: None,
+            }),
+        }
+    }
+}
+
+impl fmt::Display for Director {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "director")
+    }
+}
+
+fn read_std(std: &[u8]) -> Vec<u8> {
+    let out = String::from_utf8_lossy(std);
+    let out = out.lines().collect::<Vec<_>>().join("\n");
+    let out = out.replace("\r\n", "");
+    out.replace("\n", "").into_bytes()
+}
--- a/crates/nu-test-support/src/playground/matchers.rs
+++ b/crates/nu-test-support/src/playground/matchers.rs
@ -0,0 +1,105 @@
+use hamcrest2::core::{MatchResult, Matcher};
+use std::fmt;
+use std::str;
+
+use super::nu_process::Outcome;
+use super::{Director, Executable};
+
+#[derive(Clone)]
+pub struct Play {
+    stdout_expectation: Option<String>,
+}
+
+impl fmt::Display for Play {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "play")
+    }
+}
+
+impl fmt::Debug for Play {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "play")
+    }
+}
+
+pub fn says() -> Play {
+    Play {
+        stdout_expectation: None,
+    }
+}
+
+trait CheckerMatchers {
+    fn output(&self, actual: &Outcome) -> MatchResult;
+    fn std(&self, actual: &[u8], expected: Option<&String>, description: &str) -> MatchResult;
+    fn stdout(&self, actual: &Outcome) -> MatchResult;
+}
+
+impl CheckerMatchers for Play {
+    fn output(&self, actual: &Outcome) -> MatchResult {
+        self.stdout(actual)
+    }
+
+    fn stdout(&self, actual: &Outcome) -> MatchResult {
+        self.std(&actual.out, self.stdout_expectation.as_ref(), "stdout")
+    }
+
+    fn std(&self, actual: &[u8], expected: Option<&String>, description: &str) -> MatchResult {
+        let out = match expected {
+            Some(out) => out,
+            None => return Ok(()),
+        };
+        let actual = match str::from_utf8(actual) {
+            Err(..) => return Err(format!("{} was not utf8 encoded", description)),
+            Ok(actual) => actual,
+        };
+
+        if actual != *out {
+            return Err(format!(
+                "not equal:\n    actual: {}\n  expected: {}\n\n",
+                actual, out
+            ));
+        }
+
+        Ok(())
+    }
+}
+
+impl Matcher<Outcome> for Play {
+    fn matches(&self, output: Outcome) -> MatchResult {
+        self.output(&output)
+    }
+}
+
+impl Matcher<Director> for Play {
+    fn matches(&self, mut director: Director) -> MatchResult {
+        self.matches(&mut director)
+    }
+}
+
+impl<'a> Matcher<&'a mut Director> for Play {
+    fn matches(&self, director: &'a mut Director) -> MatchResult {
+        if director.executable().is_none() {
+            return Err(format!("no such process {}", director));
+        }
+
+        let res = director.execute();
+
+        match res {
+            Ok(out) => self.output(&out),
+            Err(err) => {
+                if let Some(out) = &err.output {
+                    return self.output(out);
+                }
+
+                Err(format!("could not exec process {}: {:?}", director, err))
+            }
+        }
+    }
+}
+
+impl Play {
+    pub fn stdout(mut self, expected: &str) -> Self {
+        self.stdout_expectation = Some(expected.to_string());
+        self
+    }
+}
--- a/crates/nu-test-support/src/playground/nu_process.rs
+++ b/crates/nu-test-support/src/playground/nu_process.rs
@ -0,0 +1,104 @@
+use super::EnvironmentVariable;
+use crate::fs::{binaries as test_bins_path, executable_path};
+use std::ffi::{OsStr, OsString};
+use std::fmt;
+use std::path::Path;
+use std::process::{Command, ExitStatus};
+
+pub trait Executable {
+    fn execute(&mut self) -> NuResult;
+}
+
+#[derive(Clone, Debug)]
+pub struct Outcome {
+    pub out: Vec<u8>,
+    pub err: Vec<u8>,
+}
+
+impl Outcome {
+    pub fn new(out: &[u8], err: &[u8]) -> Outcome {
+        Outcome {
+            out: out.to_vec(),
+            err: err.to_vec(),
+        }
+    }
+}
+
+pub type NuResult = Result<Outcome, NuError>;
+
+#[derive(Debug)]
+pub struct NuError {
+    pub desc: String,
+    pub exit: Option<ExitStatus>,
+    pub output: Option<Outcome>,
+}
+
+#[derive(Clone, Debug, Default)]
+pub struct NuProcess {
+    pub arguments: Vec<OsString>,
+    pub environment_vars: Vec<EnvironmentVariable>,
+    pub cwd: Option<OsString>,
+}
+
+impl fmt::Display for NuProcess {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "`nu")?;
+
+        for arg in &self.arguments {
+            write!(f, " {}", arg.to_string_lossy())?;
+        }
+
+        write!(f, "`")
+    }
+}
+
+impl NuProcess {
+    pub fn arg<T: AsRef<OsStr>>(&mut self, arg: T) -> &mut Self {
+        self.arguments.push(arg.as_ref().to_os_string());
+        self
+    }
+
+    pub fn args<T: AsRef<OsStr>>(&mut self, arguments: &[T]) -> &mut NuProcess {
+        self.arguments
+            .extend(arguments.iter().map(|t| t.as_ref().to_os_string()));
+        self
+    }
+
+    pub fn cwd<T: AsRef<OsStr>>(&mut self, path: T) -> &mut NuProcess {
+        self.cwd = Some(path.as_ref().to_os_string());
+        self
+    }
+
+    pub fn get_cwd(&self) -> Option<&Path> {
+        self.cwd.as_ref().map(Path::new)
+    }
+
+    pub fn construct(&self) -> Command {
+        let mut command = Command::new(&executable_path());
+
+        if let Some(cwd) = self.get_cwd() {
+            command.current_dir(cwd);
+        }
+
+        command.env_clear();
+
+        let paths = vec![test_bins_path()];
+
+        let paths_joined = match std::env::join_paths(&paths) {
+            Ok(all) => all,
+            Err(_) => panic!("Couldn't join paths for PATH var."),
+        };
+
+        command.env(crate::NATIVE_PATH_ENV_VAR, paths_joined);
+
+        for env_var in &self.environment_vars {
+            command.env(&env_var.name, &env_var.value);
+        }
+
+        for arg in &self.arguments {
+            command.arg(arg);
+        }
+
+        command
+    }
+}
--- a/crates/nu-test-support/src/playground/play.rs
+++ b/crates/nu-test-support/src/playground/play.rs
@ -0,0 +1,248 @@
+use super::Director;
+use crate::fs;
+use crate::fs::Stub;
+use getset::Getters;
+use glob::glob;
+use std::path::{Path, PathBuf};
+use std::str;
+use tempfile::{tempdir, TempDir};
+
+#[derive(Default, Clone, Debug)]
+pub struct EnvironmentVariable {
+    pub name: String,
+    pub value: String,
+}
+
+impl EnvironmentVariable {
+    fn new(name: &str, value: &str) -> Self {
+        Self {
+            name: name.to_string(),
+            value: value.to_string(),
+        }
+    }
+}
+
+pub struct Playground<'a> {
+    root: TempDir,
+    tests: String,
+    cwd: PathBuf,
+    config: PathBuf,
+    environment_vars: Vec<EnvironmentVariable>,
+    dirs: &'a Dirs,
+}
+
+#[derive(Default, Getters, Clone)]
+#[get = "pub"]
+pub struct Dirs {
+    pub root: PathBuf,
+    pub test: PathBuf,
+    pub fixtures: PathBuf,
+}
+
+impl Dirs {
+    pub fn formats(&self) -> PathBuf {
+        self.fixtures.join("formats")
+    }
+
+    pub fn config_fixtures(&self) -> PathBuf {
+        self.fixtures.join("playground/config")
+    }
+}
+
+impl<'a> Playground<'a> {
+    pub fn root(&self) -> &Path {
+        self.root.path()
+    }
+
+    pub fn cwd(&self) -> &Path {
+        &self.cwd
+    }
+
+    pub fn back_to_playground(&mut self) -> &mut Self {
+        self.cwd = PathBuf::from(self.root()).join(self.tests.clone());
+        self
+    }
+
+    pub fn play(&mut self) -> &mut Self {
+        self
+    }
+
+    pub fn setup(topic: &str, block: impl FnOnce(Dirs, &mut Playground)) {
+        let root = tempdir().expect("Couldn't create a tempdir");
+        let nuplay_dir = root.path().join(topic);
+
+        if PathBuf::from(&nuplay_dir).exists() {
+            std::fs::remove_dir_all(PathBuf::from(&nuplay_dir)).expect("can not remove directory");
+        }
+
+        std::fs::create_dir(PathBuf::from(&nuplay_dir)).expect("can not create directory");
+
+        let fixtures = fs::fixtures();
+        let cwd = std::env::current_dir().expect("Could not get current working directory.");
+        let fixtures = nu_path::canonicalize_with(fixtures.clone(), cwd).unwrap_or_else(|e| {
+            panic!(
+                "Couldn't canonicalize fixtures path {}: {:?}",
+                fixtures.display(),
+                e
+            )
+        });
+
+        let mut playground = Playground {
+            root,
+            tests: topic.to_string(),
+            cwd: nuplay_dir,
+            config: fixtures.join("playground/config/default.toml"),
+            environment_vars: Vec::default(),
+            dirs: &Dirs::default(),
+        };
+
+        let playground_root = playground.root.path();
+
+        let cwd = std::env::current_dir().expect("Could not get current working directory.");
+        let test =
+            nu_path::canonicalize_with(playground_root.join(topic), cwd).unwrap_or_else(|e| {
+                panic!(
+                    "Couldn't canonicalize test path {}: {:?}",
+                    playground_root.join(topic).display(),
+                    e
+                )
+            });
+
+        let cwd = std::env::current_dir().expect("Could not get current working directory.");
+        let root = nu_path::canonicalize_with(playground_root, cwd).unwrap_or_else(|e| {
+            panic!(
+                "Couldn't canonicalize tests root path {}: {:?}",
+                playground_root.display(),
+                e
+            )
+        });
+
+        let dirs = Dirs {
+            root,
+            test,
+            fixtures,
+        };
+
+        playground.dirs = &dirs;
+
+        block(dirs.clone(), &mut playground);
+    }
+
+    pub fn with_config(&mut self, source_file: impl AsRef<Path>) -> &mut Self {
+        self.config = source_file.as_ref().to_path_buf();
+        self
+    }
+
+    pub fn with_env(&mut self, name: &str, value: &str) -> &mut Self {
+        self.environment_vars
+            .push(EnvironmentVariable::new(name, value));
+        self
+    }
+
+    pub fn get_config(&self) -> &str {
+        self.config.to_str().expect("could not convert path.")
+    }
+
+    pub fn build(&mut self) -> Director {
+        Director {
+            cwd: Some(self.dirs.test().into()),
+            config: Some(self.config.clone().into()),
+            environment_vars: self.environment_vars.clone(),
+            ..Default::default()
+        }
+    }
+
+    pub fn cococo(&mut self, arg: &str) -> Director {
+        self.build().cococo(arg)
+    }
+
+    pub fn pipeline(&mut self, commands: &str) -> Director {
+        self.build().pipeline(commands)
+    }
+
+    pub fn mkdir(&mut self, directory: &str) -> &mut Self {
+        self.cwd.push(directory);
+        std::fs::create_dir_all(&self.cwd).expect("can not create directory");
+        self.back_to_playground();
+        self
+    }
+
+    #[cfg(not(target_arch = "wasm32"))]
+    pub fn symlink(&mut self, from: impl AsRef<Path>, to: impl AsRef<Path>) -> &mut Self {
+        let from = self.cwd.join(from);
+        let to = self.cwd.join(to);
+
+        let create_symlink = {
+            #[cfg(unix)]
+            {
+                std::os::unix::fs::symlink
+            }
+
+            #[cfg(windows)]
+            {
+                if from.is_file() {
+                    std::os::windows::fs::symlink_file
+                } else if from.is_dir() {
+                    std::os::windows::fs::symlink_dir
+                } else {
+                    panic!("symlink from must be a file or dir")
+                }
+            }
+        };
+
+        create_symlink(from, to).expect("can not create symlink");
+        self.back_to_playground();
+        self
+    }
+
+    pub fn with_files(&mut self, files: Vec<Stub>) -> &mut Self {
+        let endl = fs::line_ending();
+
+        files
+            .iter()
+            .map(|f| {
+                let mut path = PathBuf::from(&self.cwd);
+
+                let (file_name, contents) = match *f {
+                    Stub::EmptyFile(name) => (name, "fake data".to_string()),
+                    Stub::FileWithContent(name, content) => (name, content.to_string()),
+                    Stub::FileWithContentToBeTrimmed(name, content) => (
+                        name,
+                        content
+                            .lines()
+                            .skip(1)
+                            .map(|line| line.trim())
+                            .collect::<Vec<&str>>()
+                            .join(&endl),
+                    ),
+                };
+
+                path.push(file_name);
+
+                std::fs::write(path, contents.as_bytes()).expect("can not create file");
+            })
+            .for_each(drop);
+        self.back_to_playground();
+        self
+    }
+
+    pub fn within(&mut self, directory: &str) -> &mut Self {
+        self.cwd.push(directory);
+        std::fs::create_dir(&self.cwd).expect("can not create directory");
+        self
+    }
+
+    pub fn glob_vec(pattern: &str) -> Vec<PathBuf> {
+        let glob = glob(pattern);
+
+        glob.expect("invalid pattern")
+            .map(|path| {
+                if let Ok(path) = path {
+                    path
+                } else {
+                    unreachable!()
+                }
+            })
+            .collect()
+    }
+}
--- a/crates/nu-test-support/src/playground/tests.rs
+++ b/crates/nu-test-support/src/playground/tests.rs
@ -0,0 +1,41 @@
+use crate::playground::Playground;
+use std::path::{Path, PathBuf};
+
+use super::matchers::says;
+use hamcrest2::assert_that;
+use hamcrest2::prelude::*;
+
+fn path(p: &Path) -> PathBuf {
+    let cwd = std::env::current_dir().expect("Could not get current working directory.");
+    nu_path::canonicalize_with(p, cwd)
+        .unwrap_or_else(|e| panic!("Couldn't canonicalize path {}: {:?}", p.display(), e))
+}
+
+#[test]
+fn asserts_standard_out_expectation_from_nu_executable() {
+    Playground::setup("topic", |_, nu| {
+        assert_that!(nu.cococo("andres"), says().stdout("andres"));
+    })
+}
+
+#[test]
+fn current_working_directory_in_sandbox_directory_created() {
+    Playground::setup("topic", |dirs, nu| {
+        let original_cwd = dirs.test();
+        nu.within("some_directory_within");
+
+        assert_eq!(path(nu.cwd()), original_cwd.join("some_directory_within"));
+    })
+}
+
+#[test]
+fn current_working_directory_back_to_root_from_anywhere() {
+    Playground::setup("topic", |dirs, nu| {
+        let original_cwd = dirs.test();
+
+        nu.within("some_directory_within");
+        nu.back_to_playground();
+
+        assert_eq!(path(nu.cwd()), *original_cwd);
+    })
+}
--- a/src/config_files.rs
+++ b/src/config_files.rs
@ -39,7 +39,7 @@ pub(crate) fn read_config_file(engine_state: &mut EngineState, stack: &mut Stack

            if config_path.exists() {
                // FIXME: remove this message when we're ready
-                println!("Loading config from: {:?}", config_path);
+                //println!("Loading config from: {:?}", config_path);
                let config_filename = config_path.to_string_lossy().to_owned();

                if let Ok(contents) = std::fs::read_to_string(&config_path) {
--- a/src/main.rs
+++ b/src/main.rs
@ -10,6 +10,8 @@ mod utils;
 #[cfg(test)]
 mod tests;

+mod test_bins;
+
 use miette::Result;
 use nu_command::{create_default_context, BufferedReader};
 use nu_engine::get_full_help;
@ -21,7 +23,7 @@ use nu_protocol::{
    Spanned, SyntaxShape, Value, CONFIG_VARIABLE_ID,
 };
 use std::{
-    io::BufReader,
+    io::{BufReader, Write},
    path::Path,
    sync::{
        atomic::{AtomicBool, Ordering},
@ -92,6 +94,7 @@ fn main() -> Result<()> {
            // Cool, it's a flag
            if arg == "-c"
                || arg == "--commands"
+                || arg == "--testbin"
                || arg == "--develop"
                || arg == "--debug"
                || arg == "--loglevel"
@ -115,6 +118,21 @@ fn main() -> Result<()> {

    match nushell_config {
        Ok(nushell_config) => {
+            if let Some(testbin) = &nushell_config.testbin {
+                // Call out to the correct testbin
+                match testbin.item.as_str() {
+                    "echo_env" => test_bins::echo_env(),
+                    "cococo" => test_bins::cococo(),
+                    "meow" => test_bins::meow(),
+                    "iecho" => test_bins::iecho(),
+                    "fail" => test_bins::fail(),
+                    "nonu" => test_bins::nonu(),
+                    "chop" => test_bins::chop(),
+                    "repeater" => test_bins::repeater(),
+                    _ => std::process::exit(1),
+                }
+                std::process::exit(0)
+            }
            let input = if let Some(redirect_stdin) = &nushell_config.redirect_stdin {
                let stdin = std::io::stdin();
                let buf_reader = BufReader::new(stdin);
@ -193,6 +211,7 @@ fn parse_commandline_args(
            let login_shell = call.get_named_arg("login");
            let interactive_shell = call.get_named_arg("interactive");
            let commands: Option<Expression> = call.get_flag_expr("commands");
+            let testbin: Option<Expression> = call.get_flag_expr("testbin");

            let commands = if let Some(expression) = commands {
                let contents = engine_state.get_span_contents(&expression.span);
@ -205,12 +224,29 @@ fn parse_commandline_args(
                None
            };

+            let testbin = if let Some(expression) = testbin {
+                let contents = engine_state.get_span_contents(&expression.span);
+
+                Some(Spanned {
+                    item: String::from_utf8_lossy(contents).to_string(),
+                    span: expression.span,
+                })
+            } else {
+                None
+            };
+
            let help = call.has_flag("help");

            if help {
                let full_help =
                    get_full_help(&Nu.signature(), &Nu.examples(), engine_state, &mut stack);
-                print!("{}", full_help);
+
+                let _ = std::panic::catch_unwind(move || {
+                    let stdout = std::io::stdout();
+                    let mut stdout = stdout.lock();
+                    let _ = stdout.write_all(full_help.as_bytes());
+                });
+
                std::process::exit(1);
            }

@ -219,6 +255,7 @@ fn parse_commandline_args(
                login_shell,
                interactive_shell,
                commands,
+                testbin,
            });
        }
    }
@ -235,6 +272,7 @@ struct NushellConfig {
    login_shell: Option<Spanned<String>>,
    interactive_shell: Option<Spanned<String>>,
    commands: Option<Spanned<String>>,
+    testbin: Option<Spanned<String>>,
 }

 #[derive(Clone)]
@ -251,6 +289,12 @@ impl Command for Nu {
            .switch("stdin", "redirect the stdin", None)
            .switch("login", "start as a login shell", Some('l'))
            .switch("interactive", "start as an interactive shell", Some('i'))
+            .named(
+                "testbin",
+                SyntaxShape::String,
+                "run internal test binary",
+                None,
+            )
            .named(
                "commands",
                SyntaxShape::String,
--- a/src/test_bins.rs
+++ b/src/test_bins.rs
@ -0,0 +1,123 @@
+use std::io::{self, BufRead, Write};
+
+/// Echo's value of env keys from args
+/// Example: nu --testbin env_echo FOO BAR
+/// If it it's not present echo's nothing
+pub fn echo_env() {
+    let args = args();
+    for arg in args {
+        if let Ok(v) = std::env::var(arg) {
+            println!("{}", v);
+        }
+    }
+}
+
+pub fn cococo() {
+    let args: Vec<String> = args();
+
+    if args.len() > 1 {
+        // Write back out all the arguments passed
+        // if given at least 1 instead of chickens
+        // speaking co co co.
+        println!("{}", &args[1..].join(" "));
+    } else {
+        println!("cococo");
+    }
+}
+
+pub fn meow() {
+    let args: Vec<String> = args();
+
+    for arg in args.iter().skip(1) {
+        let contents = std::fs::read_to_string(arg).expect("Expected a filepath");
+        println!("{}", contents);
+    }
+}
+
+pub fn nonu() {
+    args().iter().skip(1).for_each(|arg| print!("{}", arg));
+}
+
+pub fn repeater() {
+    let mut stdout = io::stdout();
+    let args = args();
+    let mut args = args.iter().skip(1);
+    let letter = args.next().expect("needs a character to iterate");
+    let count = args.next().expect("need the number of times to iterate");
+
+    let count: u64 = count.parse().expect("can't convert count to number");
+
+    for _ in 0..count {
+        let _ = write!(stdout, "{}", letter);
+    }
+    let _ = stdout.flush();
+}
+
+pub fn iecho() {
+    // println! panics if stdout gets closed, whereas writeln gives us an error
+    let mut stdout = io::stdout();
+    let _ = args()
+        .iter()
+        .skip(1)
+        .cycle()
+        .try_for_each(|v| writeln!(stdout, "{}", v));
+}
+
+pub fn fail() {
+    std::process::exit(1);
+}
+
+pub fn chop() {
+    if did_chop_arguments() {
+        // we are done and don't care about standard input.
+        std::process::exit(0);
+    }
+
+    // if no arguments given, chop from standard input and exit.
+    let stdin = io::stdin();
+    let mut stdout = io::stdout();
+
+    for given in stdin.lock().lines().flatten() {
+        let chopped = if given.is_empty() {
+            &given
+        } else {
+            let to = given.len() - 1;
+            &given[..to]
+        };
+
+        if let Err(_e) = writeln!(stdout, "{}", chopped) {
+            break;
+        }
+    }
+
+    std::process::exit(0);
+}
+
+fn did_chop_arguments() -> bool {
+    let args: Vec<String> = args();
+
+    if args.len() > 1 {
+        let mut arguments = args.iter();
+        arguments.next();
+
+        for arg in arguments {
+            let chopped = if arg.is_empty() {
+                &arg
+            } else {
+                let to = arg.len() - 1;
+                &arg[..to]
+            };
+
+            println!("{}", chopped);
+        }
+
+        return true;
+    }
+
+    false
+}
+
+fn args() -> Vec<String> {
+    // skip (--testbin bin_name args)
+    std::env::args().skip(2).collect()
+}
--- a/src/tests.rs
+++ b/src/tests.rs
@ -26,7 +26,7 @@ pub fn run_test(input: &str, expected: &str) -> TestResult {
    let mut file = NamedTempFile::new()?;
    let name = file.path();

-    let mut cmd = Command::cargo_bin("engine-q")?;
+    let mut cmd = Command::cargo_bin("nu")?;
    cmd.arg(name);

    writeln!(file, "{}", input)?;
@ -51,7 +51,7 @@ pub fn run_test_contains(input: &str, expected: &str) -> TestResult {
    let mut file = NamedTempFile::new()?;
    let name = file.path();

-    let mut cmd = Command::cargo_bin("engine-q")?;
+    let mut cmd = Command::cargo_bin("nu")?;
    cmd.arg(name);

    writeln!(file, "{}", input)?;
@ -76,7 +76,7 @@ pub fn fail_test(input: &str, expected: &str) -> TestResult {
    let mut file = NamedTempFile::new()?;
    let name = file.path();

-    let mut cmd = Command::cargo_bin("engine-q")?;
+    let mut cmd = Command::cargo_bin("nu")?;
    cmd.arg(name);
    cmd.env(
        "PWD",
--- a/tests/assets/nu_json/charset_result.hjson
+++ b/tests/assets/nu_json/charset_result.hjson
@ -0,0 +1,5 @@
+{
+  ql-ascii: ! "#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
+  js-ascii: ! "#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
+  ml-ascii: ! "#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
+}
--- a/tests/assets/nu_json/charset_result.json
+++ b/tests/assets/nu_json/charset_result.json
@ -0,0 +1,5 @@
+{
+  "ql-ascii": "! \"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~",
+  "js-ascii": "! \"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~",
+  "ml-ascii": "! \"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~"
+}
--- a/tests/assets/nu_json/charset_test.hjson
+++ b/tests/assets/nu_json/charset_test.hjson
@ -0,0 +1,6 @@
+ql-ascii: ! "#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
+js-ascii: "! \"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~"
+ml-ascii:
+  '''
+  ! "#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
+  '''
--- a/tests/assets/nu_json/comments_result.hjson
+++ b/tests/assets/nu_json/comments_result.hjson
@ -0,0 +1,26 @@
+{
+  foo1: This is a string value. # part of the string
+  foo2: This is a string value.
+  bar1: This is a string value. // part of the string
+  bar2: This is a string value.
+  foobar1: This is a string value./* part of the string */
+  foobar2: This is a string value.
+  rem1: "# test"
+  rem2: "// test"
+  rem3: "/* test */"
+  num1: 0
+  num2: 0
+  num3: 2
+  true1: true
+  true2: true
+  true3: true
+  false1: false
+  false2: false
+  false3: false
+  null1: null
+  null2: null
+  null3: null
+  str1: 00 # part of the string
+  str2: 00.0 // part of the string
+  str3: 02 /* part of the string */
+}
--- a/tests/assets/nu_json/comments_result.json
+++ b/tests/assets/nu_json/comments_result.json
@ -0,0 +1,26 @@
+{
+  "foo1": "This is a string value. # part of the string",
+  "foo2": "This is a string value.",
+  "bar1": "This is a string value. // part of the string",
+  "bar2": "This is a string value.",
+  "foobar1": "This is a string value./* part of the string */",
+  "foobar2": "This is a string value.",
+  "rem1": "# test",
+  "rem2": "// test",
+  "rem3": "/* test */",
+  "num1": 0,
+  "num2": 0,
+  "num3": 2,
+  "true1": true,
+  "true2": true,
+  "true3": true,
+  "false1": false,
+  "false2": false,
+  "false3": false,
+  "null1": null,
+  "null2": null,
+  "null3": null,
+  "str1": "00 # part of the string",
+  "str2": "00.0 // part of the string",
+  "str3": "02 /* part of the string */"
+}
--- a/tests/assets/nu_json/comments_test.hjson
+++ b/tests/assets/nu_json/comments_test.hjson
@ -0,0 +1,48 @@
+// test
+# all
+// comment
+/*
+styles
+*/
+# with lf
+
+
+
+# !
+
+{
+  # hjson style comment
+  foo1: This is a string value. # part of the string
+  foo2: "This is a string value." # a comment
+
+  // js style comment
+  bar1: This is a string value. // part of the string
+  bar2: "This is a string value." // a comment
+
+  /* js block style comments */foobar1:/* more */This is a string value./* part of the string */
+  /* js block style comments */foobar2:/* more */"This is a string value."/* a comment */
+
+  rem1: "# test"
+  rem2: "// test"
+  rem3: "/* test */"
+
+  num1: 0 # comment
+  num2: 0.0 // comment
+  num3: 2 /* comment */
+
+  true1: true # comment
+  true2: true // comment
+  true3: true /* comment */
+
+  false1: false # comment
+  false2: false // comment
+  false3: false /* comment */
+
+  null1: null # comment
+  null2: null // comment
+  null3: null /* comment */
+
+  str1: 00 # part of the string
+  str2: 00.0 // part of the string
+  str3: 02 /* part of the string */
+}
--- a/tests/assets/nu_json/empty_result.hjson
+++ b/tests/assets/nu_json/empty_result.hjson
@ -0,0 +1,3 @@
+{
+  "": empty
+}
--- a/tests/assets/nu_json/empty_result.json
+++ b/tests/assets/nu_json/empty_result.json
@ -0,0 +1,3 @@
+{
+  "": "empty"
+}
--- a/tests/assets/nu_json/empty_test.hjson
+++ b/tests/assets/nu_json/empty_test.hjson
@ -0,0 +1,3 @@
+{
+  "": empty
+}
--- a/tests/assets/nu_json/failCharset1_test.hjson
+++ b/tests/assets/nu_json/failCharset1_test.hjson
@ -0,0 +1,4 @@
+{
+  # invalid \u char
+  char: "\uxxxx"
+}
--- a/tests/assets/nu_json/failJSON02_test.json
+++ b/tests/assets/nu_json/failJSON02_test.json
@ -0,0 +1 @@
+["Unclosed array"
--- a/tests/assets/nu_json/failJSON05_test.json
+++ b/tests/assets/nu_json/failJSON05_test.json
@ -0,0 +1 @@
+["double extra comma",,]
--- a/tests/assets/nu_json/failJSON06_test.json
+++ b/tests/assets/nu_json/failJSON06_test.json
@ -0,0 +1 @@
+[   , "<-- missing value"]
--- a/tests/assets/nu_json/failJSON07_test.json
+++ b/tests/assets/nu_json/failJSON07_test.json
@ -0,0 +1 @@
+["Comma after the close"],
--- a/tests/assets/nu_json/failJSON08_test.json
+++ b/tests/assets/nu_json/failJSON08_test.json
@ -0,0 +1 @@
+["Extra close"]]
--- a/tests/assets/nu_json/failJSON10_test.json
+++ b/tests/assets/nu_json/failJSON10_test.json
@ -0,0 +1 @@
+{"Extra value after close": true} "misplaced quoted value"
--- a/tests/assets/nu_json/failJSON11_test.json
+++ b/tests/assets/nu_json/failJSON11_test.json
@ -0,0 +1 @@
+{"Illegal expression": 1 + 2}
--- a/tests/assets/nu_json/failJSON12_test.json
+++ b/tests/assets/nu_json/failJSON12_test.json
@ -0,0 +1 @@
+{"Illegal invocation": alert()}
--- a/tests/assets/nu_json/failJSON13_test.json
+++ b/tests/assets/nu_json/failJSON13_test.json
@ -0,0 +1 @@
+{"Numbers cannot have leading zeroes": 013}
--- a/tests/assets/nu_json/failJSON14_test.json
+++ b/tests/assets/nu_json/failJSON14_test.json
@ -0,0 +1 @@
+{"Numbers cannot be hex": 0x14}
--- a/tests/assets/nu_json/failJSON15_test.json
+++ b/tests/assets/nu_json/failJSON15_test.json
@ -0,0 +1 @@
+["Illegal backslash escape: \x15"]
--- a/tests/assets/nu_json/failJSON16_test.json
+++ b/tests/assets/nu_json/failJSON16_test.json
@ -0,0 +1 @@
+[\naked]
--- a/tests/assets/nu_json/failJSON17_test.json
+++ b/tests/assets/nu_json/failJSON17_test.json
@ -0,0 +1 @@
+["Illegal backslash escape: \017"]
--- a/tests/assets/nu_json/failJSON19_test.json
+++ b/tests/assets/nu_json/failJSON19_test.json
@ -0,0 +1 @@
+{"Missing colon" null}
--- a/tests/assets/nu_json/failJSON20_test.json
+++ b/tests/assets/nu_json/failJSON20_test.json
@ -0,0 +1 @@
+{"Double colon":: null}
--- a/tests/assets/nu_json/failJSON21_test.json
+++ b/tests/assets/nu_json/failJSON21_test.json
@ -0,0 +1 @@
+{"Comma instead of colon", null}
--- a/tests/assets/nu_json/failJSON22_test.json
+++ b/tests/assets/nu_json/failJSON22_test.json
@ -0,0 +1 @@
+["Colon instead of comma": false]
--- a/tests/assets/nu_json/failJSON23_test.json
+++ b/tests/assets/nu_json/failJSON23_test.json
@ -0,0 +1 @@
+["Bad value", truth]
--- a/tests/assets/nu_json/failJSON24_test.json
+++ b/tests/assets/nu_json/failJSON24_test.json
@ -0,0 +1 @@
+['single quote']
--- a/tests/assets/nu_json/failJSON26_test.json
+++ b/tests/assets/nu_json/failJSON26_test.json
@ -0,0 +1 @@
+["tab\   character\   in\  string\  "]
--- a/tests/assets/nu_json/failJSON28_test.json
+++ b/tests/assets/nu_json/failJSON28_test.json
@ -0,0 +1,2 @@
+["line\
+break"]
--- a/tests/assets/nu_json/failJSON29_test.json
+++ b/tests/assets/nu_json/failJSON29_test.json
@ -0,0 +1 @@
+[0e]
--- a/tests/assets/nu_json/failJSON30_test.json
+++ b/tests/assets/nu_json/failJSON30_test.json
@ -0,0 +1 @@
+[0e+]
--- a/tests/assets/nu_json/failJSON31_test.json
+++ b/tests/assets/nu_json/failJSON31_test.json
@ -0,0 +1 @@
+[0e+-1]
--- a/tests/assets/nu_json/failJSON32_test.json
+++ b/tests/assets/nu_json/failJSON32_test.json
@ -0,0 +1 @@
+{"Comma instead if closing brace": true,
--- a/tests/assets/nu_json/failJSON33_test.json
+++ b/tests/assets/nu_json/failJSON33_test.json
@ -0,0 +1 @@
+["mismatch"}
--- a/tests/assets/nu_json/failJSON34_test.json
+++ b/tests/assets/nu_json/failJSON34_test.json
@ -0,0 +1,2 @@
+A quoteless string is OK,
+but two must be contained in an array.
--- a/tests/assets/nu_json/failKey1_test.hjson
+++ b/tests/assets/nu_json/failKey1_test.hjson
@ -0,0 +1,4 @@
+{
+  # invalid name
+  wrong name: 0
+}
--- a/tests/assets/nu_json/failKey2_test.hjson
+++ b/tests/assets/nu_json/failKey2_test.hjson
@ -0,0 +1,4 @@
+{
+  # invalid name
+  {name: 0
+}
--- a/tests/assets/nu_json/failKey3_test.hjson
+++ b/tests/assets/nu_json/failKey3_test.hjson
@ -0,0 +1,4 @@
+{
+  # invalid name
+  key,name: 0
+}
--- a/tests/assets/nu_json/failKey4_test.hjson
+++ b/tests/assets/nu_json/failKey4_test.hjson
@ -0,0 +1,4 @@
+{
+  # invalid name
+  : 0
+}
--- a/tests/assets/nu_json/failMLStr1_test.hjson
+++ b/tests/assets/nu_json/failMLStr1_test.hjson
@ -0,0 +1,3 @@
+{
+  # invalid multiline string
+  ml: '''
--- a/tests/assets/nu_json/failObj1_test.hjson
+++ b/tests/assets/nu_json/failObj1_test.hjson
@ -0,0 +1,6 @@
+{
+  # invalid obj
+  noDelimiter
+  {
+  }
+}
--- a/tests/assets/nu_json/failObj2_test.hjson
+++ b/tests/assets/nu_json/failObj2_test.hjson
@ -0,0 +1,6 @@
+{
+  # invalid obj
+  noEnd
+  {
+
+}
--- a/tests/assets/nu_json/failObj3_test.hjson
+++ b/tests/assets/nu_json/failObj3_test.hjson
@ -0,0 +1,7 @@
+{
+  # missing key
+
+  [
+    test
+  ]
+}
--- a/tests/assets/nu_json/failStr1a_test.hjson
+++ b/tests/assets/nu_json/failStr1a_test.hjson
@ -0,0 +1,4 @@
+{
+  # invalid quoteless string
+  ql: ]
+}
--- a/tests/assets/nu_json/failStr1b_test.hjson
+++ b/tests/assets/nu_json/failStr1b_test.hjson
@ -0,0 +1,4 @@
+{
+  # invalid quoteless string
+  ql: ]x
+}
--- a/tests/assets/nu_json/failStr1c_test.hjson
+++ b/tests/assets/nu_json/failStr1c_test.hjson
@ -0,0 +1,5 @@
+[
+  foo
+  # invalid quoteless string
+  ]
+]
--- a/tests/assets/nu_json/failStr1d_test.hjson
+++ b/tests/assets/nu_json/failStr1d_test.hjson
@ -0,0 +1,5 @@
+[
+  foo
+  # invalid quoteless string
+  ]x
+]
--- a/tests/assets/nu_json/failStr2a_test.hjson
+++ b/tests/assets/nu_json/failStr2a_test.hjson
@ -0,0 +1,4 @@
+{
+  # invalid quoteless string
+  ql: }
+}
--- a/tests/assets/nu_json/failStr2b_test.hjson
+++ b/tests/assets/nu_json/failStr2b_test.hjson
@ -0,0 +1,4 @@
+{
+  # invalid quoteless string
+  ql: }x
+}
--- a/tests/assets/nu_json/failStr2c_test.hjson
+++ b/tests/assets/nu_json/failStr2c_test.hjson
@ -0,0 +1,5 @@
+[
+  foo
+  # invalid quoteless string
+  }
+]
--- a/tests/assets/nu_json/failStr2d_test.hjson
+++ b/tests/assets/nu_json/failStr2d_test.hjson
@ -0,0 +1,5 @@
+[
+  foo
+  # invalid quoteless string
+  }x
+]
--- a/tests/assets/nu_json/failStr3a_test.hjson
+++ b/tests/assets/nu_json/failStr3a_test.hjson
@ -0,0 +1,4 @@
+{
+  # invalid quoteless string
+  ql: {
+}
--- a/tests/assets/nu_json/failStr3b_test.hjson
+++ b/tests/assets/nu_json/failStr3b_test.hjson
@ -0,0 +1,4 @@
+{
+  # invalid quoteless string
+  ql: {x
+}
--- a/tests/assets/nu_json/failStr3c_test.hjson
+++ b/tests/assets/nu_json/failStr3c_test.hjson
@ -0,0 +1,5 @@
+[
+  foo
+  # invalid quoteless string
+  {
+]
--- a/tests/assets/nu_json/failStr3d_test.hjson
+++ b/tests/assets/nu_json/failStr3d_test.hjson
@ -0,0 +1,5 @@
+[
+  foo
+  # invalid quoteless string
+  {x
+]
--- a/tests/assets/nu_json/failStr4a_test.hjson
+++ b/tests/assets/nu_json/failStr4a_test.hjson
@ -0,0 +1,4 @@
+{
+  # invalid quoteless string
+  ql: [
+}
--- a/tests/assets/nu_json/failStr4b_test.hjson
+++ b/tests/assets/nu_json/failStr4b_test.hjson
@ -0,0 +1,4 @@
+{
+  # invalid quoteless string
+  ql: [x
+}
--- a/tests/assets/nu_json/failStr4c_test.hjson
+++ b/tests/assets/nu_json/failStr4c_test.hjson
@ -0,0 +1,5 @@
+[
+  foo
+  # invalid quoteless string
+  [
+]
--- a/tests/assets/nu_json/failStr4d_test.hjson
+++ b/tests/assets/nu_json/failStr4d_test.hjson
@ -0,0 +1,5 @@
+[
+  foo
+  # invalid quoteless string
+  [x
+]
--- a/tests/assets/nu_json/failStr5a_test.hjson
+++ b/tests/assets/nu_json/failStr5a_test.hjson
@ -0,0 +1,4 @@
+{
+  # invalid quoteless string
+  ql: :
+}
--- a/tests/assets/nu_json/failStr5b_test.hjson
+++ b/tests/assets/nu_json/failStr5b_test.hjson
@ -0,0 +1,4 @@
+{
+  # invalid quoteless string
+  ql: :x
+}
--- a/tests/assets/nu_json/failStr5c_test.hjson
+++ b/tests/assets/nu_json/failStr5c_test.hjson
@ -0,0 +1,5 @@
+[
+  foo
+  # invalid quoteless string
+  :
+]
--- a/tests/assets/nu_json/failStr5d_test.hjson
+++ b/tests/assets/nu_json/failStr5d_test.hjson
@ -0,0 +1,5 @@
+[
+  foo
+  # invalid quoteless string
+  :x
+]
--- a/tests/assets/nu_json/failStr6a_test.hjson
+++ b/tests/assets/nu_json/failStr6a_test.hjson
@ -0,0 +1,4 @@
+{
+  # invalid quoteless string
+  ql: ,
+}
--- a/tests/assets/nu_json/failStr6b_test.hjson
+++ b/tests/assets/nu_json/failStr6b_test.hjson
@ -0,0 +1,4 @@
+{
+  # invalid quoteless string
+  ql: ,x
+}
--- a/tests/assets/nu_json/failStr6c_test.hjson
+++ b/tests/assets/nu_json/failStr6c_test.hjson
@ -0,0 +1,6 @@
+[
+  # invalid quoteless string
+  # note that if there were a preceding value the comma would
+  # be allowed/ignored as a separator/trailing comma
+  ,
+]
--- a/tests/assets/nu_json/failStr6d_test.hjson
+++ b/tests/assets/nu_json/failStr6d_test.hjson
@ -0,0 +1,6 @@
+[
+  # invalid quoteless string
+  # note that if there were a preceding value the comma would
+  # be allowed/ignored as a separator/trailing comma
+  ,x
+]
--- a/tests/assets/nu_json/kan_result.hjson
+++ b/tests/assets/nu_json/kan_result.hjson
@ -0,0 +1,48 @@
+{
+  numbers:
+  [
+    0
+    0
+    0
+    42
+    42.1
+    -5
+    -5.1
+    1701
+    -1701
+    12.345
+    -12.345
+  ]
+  native:
+  [
+    true
+    true
+    false
+    false
+    null
+    null
+  ]
+  strings:
+  [
+    x 0
+    .0
+    00
+    01
+    0 0 0
+    42 x
+    42.1 asdf
+    1.2.3
+    -5 0 -
+    -5.1 --
+    17.01e2 +
+    -17.01e2 :
+    12345e-3 @
+    -12345e-3 $
+    true true
+    x true
+    false false
+    x false
+    null null
+    x null
+  ]
+}
--- a/tests/assets/nu_json/kan_result.json
+++ b/tests/assets/nu_json/kan_result.json
@ -0,0 +1,45 @@
+{
+  "numbers": [
+    0,
+    0,
+    0,
+    42,
+    42.1,
+    -5,
+    -5.1,
+    1701,
+    -1701,
+    12.345,
+    -12.345
+  ],
+  "native": [
+    true,
+    true,
+    false,
+    false,
+    null,
+    null
+  ],
+  "strings": [
+    "x 0",
+    ".0",
+    "00",
+    "01",
+    "0 0 0",
+    "42 x",
+    "42.1 asdf",
+    "1.2.3",
+    "-5 0 -",
+    "-5.1 --",
+    "17.01e2 +",
+    "-17.01e2 :",
+    "12345e-3 @",
+    "-12345e-3 $",
+    "true true",
+    "x true",
+    "false false",
+    "x false",
+    "null null",
+    "x null"
+  ]
+}
--- a/tests/assets/nu_json/kan_test.hjson
+++ b/tests/assets/nu_json/kan_test.hjson
@ -0,0 +1,49 @@
+{
+  # the comma forces a whitespace check
+  numbers:
+  [
+    0
+    0   ,
+    -0
+    42  ,
+    42.1  ,
+    -5
+    -5.1
+    17.01e2
+    -17.01e2
+    12345e-3  ,
+    -12345e-3  ,
+  ]
+  native:
+  [
+    true   ,
+    true
+    false  ,
+    false
+    null   ,
+    null
+  ]
+  strings:
+  [
+    x 0
+    .0
+    00
+    01
+    0 0 0
+    42 x
+    42.1 asdf
+    1.2.3
+    -5 0 -
+    -5.1 --
+    17.01e2 +
+    -17.01e2 :
+    12345e-3 @
+    -12345e-3 $
+    true true
+    x true
+    false false
+    x false
+    null null
+    x null
+  ]
+}
--- a/tests/assets/nu_json/keys_result.hjson
+++ b/tests/assets/nu_json/keys_result.hjson
@ -0,0 +1,34 @@
+{
+  unquoted_key: test
+  _unquoted: test
+  test-key: test
+  -test: test
+  .key: test
+  trailing: test
+  trailing2: test
+  "#c1": test
+  "foo#bar": test
+  "//bar": test
+  "foo//bar": test
+  "/*foo*/": test
+  "foo/*foo*/bar": test
+  "/*": test
+  "foo/*bar": test
+  "\"": test
+  "foo\"bar": test
+  "'''": test
+  "foo'''bar": test
+  ":": test
+  "foo:bar": test
+  "{": test
+  "foo{bar": test
+  "}": test
+  "foo}bar": test
+  "[": test
+  "foo[bar": test
+  "]": test
+  "foo]bar": test
+  nl1: test
+  nl2: test
+  nl3: test
+}
--- a/tests/assets/nu_json/keys_result.json
+++ b/tests/assets/nu_json/keys_result.json
@ -0,0 +1,34 @@
+{
+  "unquoted_key": "test",
+  "_unquoted": "test",
+  "test-key": "test",
+  "-test": "test",
+  ".key": "test",
+  "trailing": "test",
+  "trailing2": "test",
+  "#c1": "test",
+  "foo#bar": "test",
+  "//bar": "test",
+  "foo//bar": "test",
+  "/*foo*/": "test",
+  "foo/*foo*/bar": "test",
+  "/*": "test",
+  "foo/*bar": "test",
+  "\"": "test",
+  "foo\"bar": "test",
+  "'''": "test",
+  "foo'''bar": "test",
+  ":": "test",
+  "foo:bar": "test",
+  "{": "test",
+  "foo{bar": "test",
+  "}": "test",
+  "foo}bar": "test",
+  "[": "test",
+  "foo[bar": "test",
+  "]": "test",
+  "foo]bar": "test",
+  "nl1": "test",
+  "nl2": "test",
+  "nl3": "test"
+}
--- a/tests/assets/nu_json/keys_test.hjson
+++ b/tests/assets/nu_json/keys_test.hjson
@ -0,0 +1,48 @@
+{
+  # unquoted keys
+  unquoted_key: test
+  _unquoted: test
+  test-key: test
+  -test: test
+  .key: test
+  # trailing spaces in key names are ignored
+  trailing : test
+  trailing2  : test
+  # comment char in key name
+  "#c1": test
+  "foo#bar": test
+  "//bar": test
+  "foo//bar": test
+  "/*foo*/": test
+  "foo/*foo*/bar": test
+  "/*": test
+  "foo/*bar": test
+  # quotes in key name
+  "\"": test
+  "foo\"bar": test
+  "'''": test
+  "foo'''bar": test
+  # control char in key name
+  ":": test
+  "foo:bar": test
+  "{": test
+  "foo{bar": test
+  "}": test
+  "foo}bar": test
+  "[": test
+  "foo[bar": test
+  "]": test
+  "foo]bar": test
+  # newline
+  nl1:
+    test
+  nl2
+    :
+    test
+
+  nl3
+
+    :
+
+    test
+}
--- a/tests/assets/nu_json/oa_result.hjson
+++ b/tests/assets/nu_json/oa_result.hjson
@ -0,0 +1,13 @@
+[
+  a
+  {}
+  {}
+  []
+  []
+  {
+    b: 1
+    c: []
+    d: {}
+  }
+  []
+]
--- a/tests/assets/nu_json/oa_result.json
+++ b/tests/assets/nu_json/oa_result.json
@ -0,0 +1,13 @@
+[
+  "a",
+  {},
+  {},
+  [],
+  [],
+  {
+    "b": 1,
+    "c": [],
+    "d": {}
+  },
+  []
+]
--- a/tests/assets/nu_json/oa_test.hjson
+++ b/tests/assets/nu_json/oa_test.hjson
@ -0,0 +1,13 @@
+[
+  a
+  {}
+  {}
+  []
+  []
+  {
+    b: 1
+    c: []
+    d: {}
+  }
+  []
+]
--- a/Show More
+++ b/Show More
				`@ -0,0 +1 @@`
				`{"Extra value after close": true} "misplaced quoted value"`