tests/stat: Test case for using - and -f together

tests/by-util/test_stat.rs

@@ -304,6 +304,19 @@ fn test_stdin_pipe_fifo2() {
         .succeeded();
 }
 
+#[test]
+#[cfg(all(unix, not(target_os = "android")))]
+fn test_stdin_with_fs_option() {
+    // $ stat -f -
+    new_ucmd!()
+        .arg("-f")
+        .arg("-")
+        .set_stdin(std::process::Stdio::null())
+        .fails()
+        .code_is(1)
+        .stderr_contains("using '-' to denote standard input does not work in file system mode");
+}
+
 #[test]
 #[cfg(all(
     unix,