completely rewrote test suite for top level src files and all builtin files

src/builtin/cd.rs

@@ -75,3 +75,162 @@ pub fn cd(node: Node) -> ShResult<()> {
   state::set_status(0);
   Ok(())
 }
+
+#[cfg(test)]
+pub mod tests {
+    use std::env;
+    use std::fs;
+
+    use tempfile::TempDir;
+
+    use crate::state;
+    use crate::testutil::{TestGuard, test_input};
+
+	// ===================== Basic Navigation =====================
+
+	#[test]
+	fn cd_simple() {
+		let _g = TestGuard::new();
+		let old_dir = env::current_dir().unwrap();
+		let temp_dir = TempDir::new().unwrap();
+
+		test_input(format!("cd {}", temp_dir.path().display())).unwrap();
+
+		let new_dir = env::current_dir().unwrap();
+		assert_ne!(old_dir, new_dir);
+
+		assert_eq!(new_dir.display().to_string(), temp_dir.path().display().to_string());
+	}
+
+	#[test]
+	fn cd_no_args_goes_home() {
+		let _g = TestGuard::new();
+		let temp_dir = TempDir::new().unwrap();
+		unsafe { env::set_var("HOME", temp_dir.path()) };
+
+		test_input("cd").unwrap();
+
+		let cwd = env::current_dir().unwrap();
+		assert_eq!(cwd.display().to_string(), temp_dir.path().display().to_string());
+	}
+
+	#[test]
+	fn cd_relative_path() {
+		let _g = TestGuard::new();
+		let temp_dir = TempDir::new().unwrap();
+		let sub = temp_dir.path().join("child");
+		fs::create_dir(&sub).unwrap();
+
+		test_input(format!("cd {}", temp_dir.path().display())).unwrap();
+		test_input("cd child").unwrap();
+
+		let cwd = env::current_dir().unwrap();
+		assert_eq!(cwd.display().to_string(), sub.display().to_string());
+	}
+
+	// ===================== Environment =====================
+
+	#[test]
+	fn cd_sets_pwd_env() {
+		let _g = TestGuard::new();
+		let temp_dir = TempDir::new().unwrap();
+
+		test_input(format!("cd {}", temp_dir.path().display())).unwrap();
+
+		let pwd = env::var("PWD").unwrap();
+		assert_eq!(pwd, env::current_dir().unwrap().display().to_string());
+	}
+
+	#[test]
+	fn cd_status_zero_on_success() {
+		let _g = TestGuard::new();
+		let temp_dir = TempDir::new().unwrap();
+
+		test_input(format!("cd {}", temp_dir.path().display())).unwrap();
+
+		assert_eq!(state::get_status(), 0);
+	}
+
+	// ===================== Error Cases =====================
+
+	#[test]
+	fn cd_nonexistent_dir_fails() {
+		let _g = TestGuard::new();
+		let result = test_input("cd /nonexistent_path_that_does_not_exist_xyz");
+		assert!(result.is_err());
+	}
+
+	#[test]
+	fn cd_file_not_directory_fails() {
+		let _g = TestGuard::new();
+		let temp_dir = TempDir::new().unwrap();
+		let file_path = temp_dir.path().join("afile.txt");
+		fs::write(&file_path, "hello").unwrap();
+
+		let result = test_input(format!("cd {}", file_path.display()));
+		assert!(result.is_err());
+	}
+
+	// ===================== Multiple cd =====================
+
+	#[test]
+	fn cd_multiple_times() {
+		let _g = TestGuard::new();
+		let dir_a = TempDir::new().unwrap();
+		let dir_b = TempDir::new().unwrap();
+
+		test_input(format!("cd {}", dir_a.path().display())).unwrap();
+		assert_eq!(
+			env::current_dir().unwrap().display().to_string(),
+			dir_a.path().display().to_string()
+		);
+
+		test_input(format!("cd {}", dir_b.path().display())).unwrap();
+		assert_eq!(
+			env::current_dir().unwrap().display().to_string(),
+			dir_b.path().display().to_string()
+		);
+	}
+
+	#[test]
+	fn cd_nested_subdirectories() {
+		let _g = TestGuard::new();
+		let temp_dir = TempDir::new().unwrap();
+		let deep = temp_dir.path().join("a").join("b").join("c");
+		fs::create_dir_all(&deep).unwrap();
+
+		test_input(format!("cd {}", deep.display())).unwrap();
+		assert_eq!(
+			env::current_dir().unwrap().display().to_string(),
+			deep.display().to_string()
+		);
+	}
+
+	// ===================== Autocmd Integration =====================
+
+	#[test]
+	fn cd_fires_post_change_dir_autocmd() {
+		let guard = TestGuard::new();
+		let temp_dir = TempDir::new().unwrap();
+
+		test_input("autocmd post-change-dir 'echo cd-hook-fired'").unwrap();
+		guard.read_output();
+
+		test_input(format!("cd {}", temp_dir.path().display())).unwrap();
+		let out = guard.read_output();
+		assert!(out.contains("cd-hook-fired"));
+	}
+
+	#[test]
+	fn cd_fires_pre_change_dir_autocmd() {
+		let guard = TestGuard::new();
+		let temp_dir = TempDir::new().unwrap();
+
+		test_input("autocmd pre-change-dir 'echo pre-cd'").unwrap();
+		guard.read_output();
+
+		test_input(format!("cd {}", temp_dir.path().display())).unwrap();
+		let out = guard.read_output();
+		assert!(out.contains("pre-cd"));
+	}
+}