feature[env]: Add support for --chdir=DIR in env (fixes #1568) (#1569)

tests/by-util/test_env.rs

@@ -1,4 +1,11 @@
+#[cfg(not(windows))]
+use std::fs;
+
+use std::path::Path;
+extern crate tempfile;
+use self::tempfile::tempdir;
 use crate::common::util::*;
+use std::env;
 
 #[test]
 fn test_env_help() {
@@ -150,3 +157,64 @@ fn test_fail_null_with_program() {
     let out = new_ucmd!().arg("--null").arg("cd").fails().stderr;
     assert!(out.contains("cannot specify --null (-0) with command"));
 }
+
+#[cfg(not(windows))]
+#[test]
+fn test_change_directory() {
+    let scene = TestScenario::new(util_name!());
+    let temporary_directory = tempdir().unwrap();
+    let temporary_path = fs::canonicalize(temporary_directory.path()).unwrap();
+    assert_ne!(env::current_dir().unwrap(), temporary_path);
+
+    // command to print out current working directory
+    let pwd = "pwd";
+
+    let out = scene
+        .ucmd()
+        .arg("--chdir")
+        .arg(&temporary_path)
+        .arg(pwd)
+        .run()
+        .stdout;
+    assert_eq!(out.trim(), temporary_path.as_os_str())
+}
+
+// no way to consistently get "current working directory", `cd` doesn't work @ CI
+// instead, we test that the unique temporary directory appears somewhere in the printed variables
+#[cfg(windows)]
+#[test]
+fn test_change_directory() {
+    let scene = TestScenario::new(util_name!());
+    let temporary_directory = tempdir().unwrap();
+    let temporary_path = temporary_directory.path();
+
+    assert_ne!(env::current_dir().unwrap(), temporary_path);
+
+    let out = scene
+        .ucmd()
+        .arg("--chdir")
+        .arg(&temporary_path)
+        .run()
+        .stdout;
+    assert_eq!(
+        out.lines()
+            .any(|line| line.ends_with(temporary_path.file_name().unwrap().to_str().unwrap())),
+        false
+    );
+}
+
+#[test]
+fn test_fail_change_directory() {
+    let scene = TestScenario::new(util_name!());
+    let some_non_existing_path = "some_nonexistent_path";
+    assert_eq!(Path::new(some_non_existing_path).is_dir(), false);
+
+    let out = scene
+        .ucmd()
+        .arg("--chdir")
+        .arg(some_non_existing_path)
+        .arg("pwd")
+        .fails()
+        .stderr;
+    assert!(out.contains("env: cannot change directory to "));
+}