Add test for auto-cd

tests/terminal/mod.rs

@@ -5,6 +5,38 @@ use nu_test_support::terminal::{
 };
 use std::{io::Write, time::Duration};
 
+#[test]
+fn auto_cd_works() {
+    // Setup a directory with a sub-directory in it.
+    let cwd = tempfile::tempdir().unwrap();
+    std::fs::create_dir(cwd.path().join("foo")).unwrap();
+
+    // Create the PTY and the terminal.
+    let mut pty = pty_with_nushell(
+        vec!["--no-config-file".to_string()],
+        Some(cwd.path().to_path_buf()),
+    );
+    let (mut term, mut events) = default_terminal();
+
+    // Wait for Nushell to initalize.
+    std::thread::sleep(Duration::from_millis(500));
+
+    #[cfg(windows)]
+    pty.writer().write_all(b".\\foo\r").unwrap();
+    #[cfg(unix)]
+    pty.writer().write_all(b"./foo\r").unwrap();
+
+    pty.writer().write_all(b"pwd\r").unwrap();
+
+    // Read the response from Nushell.
+    read_to_end(&mut term, &mut pty, &mut events, pty_write_handler);
+
+    // Examine the terminal state.
+    let (row, _col) = extract_cursor(&term);
+    let text = extract_text(&term);
+    assert!(text[row - 1].contains("foo"));
+}
+
 #[test]
 fn command_hints_are_pwd_aware() {
     // PWD-aware command hints require setting history file format to "sqlite".