@Test
  fun invalidPort() {
    val requestBuilder = Request.Builder()
    assertFailsWith<IllegalArgumentException> {
      requestBuilder.url("http://localhost:65536/")
    }.also { expected ->
      assertThat(expected.message).isEqualTo("Invalid URL port: \"65536\"")
    }
  }

  @Test
  fun getReturns500() {
    server.enqueue(MockResponse(code = 500))
    executeSynchronously("/")
      .assertCode(500)