tests/base32: update test

tests/by-util/test_base32.rs

@@ -113,12 +113,18 @@ fn test_wrap_bad_arg() {
 
 #[test]
 fn test_base32_extra_operand() {
+    let ts = TestScenario::new(util_name!());
+
     // Expect a failure when multiple files are specified.
-    new_ucmd!()
+    ts.ucmd()
         .arg("a.txt")
         .arg("b.txt")
         .fails()
-        .stderr_only("base32: extra operand 'b.txt'\nTry 'base32 --help' for more information.");
+        .stderr_only(format!(
+            "{0}: extra operand 'b.txt'\nTry '{1} {0} --help' for more information.",
+            ts.util_name,
+            ts.bin_path.to_string_lossy()
+        ));
 }
 
 #[test]