date: bugfix test_date_for_no_permission_file (#4544)

tests/by-util/test_date.rs

@@ -282,6 +282,27 @@ fn test_date_for_invalid_file() {
 }
 
 #[test]
+#[cfg(unix)]
+fn test_date_for_no_permission_file() {
+    let (at, mut ucmd) = at_and_ucmd!();
+    const FILE: &str = "file-no-perm-1";
+
+    use std::os::unix::fs::PermissionsExt;
+    let file = std::fs::OpenOptions::new()
+        .create(true)
+        .write(true)
+        .open(at.plus(FILE))
+        .unwrap();
+    file.set_permissions(std::fs::Permissions::from_mode(0o222))
+        .unwrap();
+    let result = ucmd.arg("--file").arg(FILE).fails();
+    result.no_stdout();
+    assert_eq!(
+        result.stderr_str().trim(),
+        format!("date: {FILE}: Permission denied")
+    );
+}
+
 fn test_date_for_dir_as_file() {
     let result = new_ucmd!().arg("--file").arg("/").fails();
     result.no_stdout();