tests/basename: add tests for --version, --help

tests/by-util/test_basename.rs

@@ -1,6 +1,29 @@
 use crate::common::util::*;
 use std::ffi::OsStr;
 
+#[test]
+fn test_help() {
+    for help_flg in vec!["-h", "--help"] {
+        new_ucmd!()
+            .arg(&help_flg)
+            .succeeds()
+            .no_stderr()
+            .stdout_contains("USAGE:");
+    }
+}
+
+#[test]
+fn test_version() {
+    for version_flg in vec!["-V", "--version"] {
+        assert!(new_ucmd!()
+            .arg(&version_flg)
+            .succeeds()
+            .no_stderr()
+            .stdout_str()
+            .starts_with("basename"));
+    }
+}
+
 #[test]
 fn test_directory() {
     new_ucmd!()