Add first integration test

src/main.rs

@@ -17,6 +17,7 @@ mod parser;
 mod prelude;
 mod shell;
 mod stream;
+mod tests;
 
 use clap::{App, Arg};
 use log::LevelFilter;

src/tests.rs

@@ -0,0 +1,61 @@
+#[cfg(test)]
+mod tests {
+    use std::path::PathBuf;
+    use std::io::prelude::*;
+    use std::process::{Command, Stdio};
+    use std::error::Error;
+
+    fn test_helper(test_name: &str) {
+        let mut baseline_path = PathBuf::new();
+        baseline_path.push("tests");
+        baseline_path.push(test_name);
+        baseline_path.set_extension("out");
+
+        let mut txt_path = PathBuf::new();
+        txt_path.push("tests");
+        txt_path.push(test_name);
+        txt_path.set_extension("txt");
+
+        let executable = {
+            let mut buf = PathBuf::new();
+            buf.push("target");
+            buf.push("debug");
+            buf.push("nu");
+            buf
+        };
+
+        let process = match Command::new(executable)
+            .stdin(Stdio::piped())
+            .stdout(Stdio::piped())
+            .spawn() {
+
+            Ok(process) => process,
+            Err(why) => panic!("Can't run test {}", why.description())
+        };
+
+        let baseline_out = std::fs::read_to_string(baseline_path).unwrap();
+        let baseline_out = baseline_out.replace("\r\n", "\n");
+        let input_commands = std::fs::read_to_string(txt_path).unwrap();
+
+        match process.stdin.unwrap().write_all(input_commands.as_bytes()) {
+            Err(why) => panic!("couldn't write to wc stdin: {}",
+                            why.description()),
+            Ok(_) => println!("sent pangram to wc"),
+        }
+
+        let mut s = String::new();
+        match process.stdout.unwrap().read_to_string(&mut s) {
+            Err(why) => panic!("couldn't read stdout: {}",
+                            why.description()),
+            Ok(_) => {
+                let s = s.replace("\r\n", "\n");
+                assert_eq!(s, baseline_out);
+            }
+        }
+    }
+
+    #[test]
+    fn test_toml() {
+        test_helper("open_toml");
+    }
+}

tests/open_toml.out

@@ -0,0 +1 @@
+2018

tests/open_toml.txt

@@ -0,0 +1,2 @@
+open tests\test.toml | select package.edition | echo $it
+exit