chroot: add a new test to verify that 'chroot / ls -al' works

tests/by-util/test_chroot.rs

@@ -1,4 +1,4 @@
-// spell-checker:ignore (words) araba newroot userspec chdir
+// spell-checker:ignore (words) araba newroot userspec chdir pwd's
 
 use crate::common::util::*;
 
@@ -162,3 +162,22 @@ fn test_chroot_skip_chdir() {
         print!("Test skipped; requires root user");
     }
 }
+
+#[test]
+fn test_chroot_extra_arg() {
+    let ts = TestScenario::new(util_name!());
+    let at = &ts.fixtures;
+
+    let dir = "CHROOT_DIR";
+    at.mkdir(dir);
+    let env_cd = std::env::current_dir().unwrap();
+    // Verify that -P is pwd's and not chroot
+    if let Ok(result) = run_ucmd_as_root(&ts, &[dir, "pwd", "-P"]) {
+        assert_eq!(
+            result.success().no_stderr().stdout_str(),
+            env_cd.to_str().unwrap()
+        );
+    } else {
+        print!("Test skipped; requires root user");
+    }
+}