tests/ls: Implement tests for sort by width option

tests/by-util/test_ls.rs

@@ -1564,6 +1564,28 @@ fn test_ls_sort_name() {
  .stdout_is(".a\n.b\na\nb\n");
 }
 
+#[test]
+fn test_ls_sort_width() {
+ let scene = TestScenario::new(util_name!());
+ let at = &scene.fixtures;
+
+ at.touch("aaaaa");
+ at.touch("bbb");
+ at.touch("cccc");
+ at.touch("eee");
+ at.touch("d");
+ at.touch("fffff");
+ at.touch("abc");
+ at.touch("zz");
+ at.touch("bcdef");
+
+ scene
+ .ucmd()
+ .arg("--sort=width")
+ .succeeds()
+ .stdout_is("d\nzz\nabc\nbbb\neee\ncccc\naaaaa\nbcdef\nfffff\n");
+}
+
 #[test]
 fn test_ls_order_size() {
  let scene = TestScenario::new(util_name!());