Harden Windows PowerShell output tests

codex-rs/windows-sandbox-rs/src/unified_exec/tests.rs

@@ -236,7 +236,7 @@ fn legacy_non_tty_powershell_emits_output() {
                 pwsh.display().to_string(),
                 "-NoProfile".to_string(),
                 "-Command".to_string(),
-                "Write-Output LEGACY-NONTTY-DIRECT".to_string(),
+                "'LEGACY-NONTTY-DIRECT'".to_string(),
             ],
             cwd.as_path(),
             HashMap::new(),
@@ -421,7 +421,7 @@ fn legacy_capture_powershell_emits_output() {
             pwsh.display().to_string(),
             "-NoProfile".to_string(),
             "-Command".to_string(),
-            "Write-Output LEGACY-CAPTURE-DIRECT".to_string(),
+            "'LEGACY-CAPTURE-DIRECT'".to_string(),
         ],
         cwd.as_path(),
         HashMap::new(),
@@ -462,7 +462,7 @@ fn legacy_tty_powershell_emits_output_and_accepts_input() {
                 "-NoProfile".to_string(),
                 "-NoExit".to_string(),
                 "-Command".to_string(),
-                "$PID; Write-Output ready".to_string(),
+                "$PID; 'ready'".to_string(),
             ],
             cwd.as_path(),
             HashMap::new(),
@@ -479,7 +479,7 @@ fn legacy_tty_powershell_emits_output_and_accepts_input() {
 
         let writer = spawned.session.writer_sender();
         writer
-            .send(b"Write-Output second\n".to_vec())
+            .send(b"'second'\n".to_vec())
             .await
             .expect("send second command");
         writer