t.Fatalf("read Body: %v", err)
	}
	s := string(b)
	if !strings.Contains(s, "<a href=\"a\">a</a>\n<a href=\"b\">b</a>") {
		t.Errorf("output appears to be unsorted:\n%s", s)
	}
}

func mustRemoveAll(dir string) {
	err := os.RemoveAll(dir)
	if err != nil {
		panic(err)
	}
}

func TestFileServerImplicitLeadingSlash(t *testing.T) { run(t, testFileServerImplicitLeadingSlash) }