Command tests (#922)

* WIP command tests

* Finish marking todo tests

* update

* update

* Windows cd test ignoring

crates/nu-command/tests/commands/format.rs

@@ -0,0 +1,101 @@
+use nu_test_support::fs::Stub::{EmptyFile, FileWithContentToBeTrimmed};
+use nu_test_support::playground::Playground;
+use nu_test_support::{nu, pipeline};
+
+#[test]
+fn creates_the_resulting_string_from_the_given_fields() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+        open cargo_sample.toml
+            | get package
+            | format "{name} has license {license}"
+        "#
+    ));
+
+    assert_eq!(actual.out, "nu has license ISC");
+}
+
+// FIXME: jt: needs more work
+#[ignore]
+#[test]
+fn given_fields_can_be_column_paths() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+        open cargo_sample.toml
+            | format "{package.name} is {package.description}"
+        "#
+    ));
+
+    assert_eq!(actual.out, "nu is a new type of shell");
+}
+
+// FIXME: jt: needs more work
+#[ignore]
+#[test]
+fn can_use_variables() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+        open cargo_sample.toml
+            | format "{$it.package.name} is {$it.package.description}"
+        "#
+    ));
+
+    assert_eq!(actual.out, "nu is a new type of shell");
+}
+
+// FIXME: jt: needs more work
+#[ignore]
+#[test]
+fn format_filesize_works() {
+    Playground::setup("format_filesize_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![
+            EmptyFile("yehuda.txt"),
+            EmptyFile("jonathan.txt"),
+            EmptyFile("andres.txt"),
+        ]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                ls
+                | format filesize size KB
+                | get size
+                | first
+            "#
+        ));
+
+        assert_eq!(actual.out, "0.0 KB");
+    })
+}
+
+// FIXME: jt: needs more work
+#[ignore]
+#[test]
+fn format_filesize_works_with_nonempty_files() {
+    Playground::setup(
+        "format_filesize_works_with_nonempty_files",
+        |dirs, sandbox| {
+            sandbox.with_files(vec![FileWithContentToBeTrimmed(
+                "sample.toml",
+                r#"
+                    [dependency]
+                    name = "nu"
+                "#,
+            )]);
+
+            let actual = nu!(
+                cwd: dirs.test(),
+                "ls sample.toml | format filesize size B | get size | first"
+            );
+
+            #[cfg(not(windows))]
+            assert_eq!(actual.out, "25");
+
+            #[cfg(windows)]
+            assert_eq!(actual.out, "27");
+        },
+    )
+}