if err != nil {
			t.Fatalf("open of %s: %v", name, err)
		}
		defer f.Close()
	}
	test(Dir(""))
	test(Dir("."))
	test(Dir("./"))
}

func TestServeFileContentType(t *testing.T) { run(t, testServeFileContentType) }
func testServeFileContentType(t *testing.T, mode testMode) {
	const ctype = "icecream/chocolate"
	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {