wc: more tests

tests/by-util/test_wc.rs

@@ -243,6 +243,14 @@ fn test_single_only_lines() {
         .stdout_is("18 moby_dick.txt\n");
 }
 
+#[test]
+fn test_single_only_bytes() {
+    new_ucmd!()
+        .args(&["-c", "lorem_ipsum.txt"])
+        .run()
+        .stdout_is("772 lorem_ipsum.txt\n");
+}
+
 #[test]
 fn test_single_all_counts() {
     new_ucmd!()