val clientA = clientTestRule.newClient()
    val clientB = clientTestRule.newClient()
    assertThat(clientB.certificatePinner).isEqualTo(clientA.certificatePinner)
  }

  @Test fun nullInterceptorInList() {
    val builder = OkHttpClient.Builder()
    builder.interceptors().addAll(listOf(null) as List<Interceptor>)
    assertFailsWith<IllegalStateException> {
      builder.build()
    }.also { expected ->