使用 mockito 模拟 HttpClient 请求

Question

我有以下代码，希望使用 Junit 和 Mockito 进行测试。

要测试的代码：

    Header header = new BasicHeader(HttpHeaders.AUTHORIZATION,AUTH_PREAMBLE + token);
    List<Header> headers = new ArrayList<Header>();
    headers.add(header);
    HttpClient client = HttpClients.custom().setDefaultHeaders(headers).build();
    HttpGet get = new HttpGet("real REST API here"));
    HttpResponse response = client.execute(get);
    String json_string_response = EntityUtils.toString(response.getEntity());

和测试

protected static HttpClient mockHttpClient;
protected static HttpGet mockHttpGet;
protected static HttpResponse mockHttpResponse;
protected static StatusLine mockStatusLine;
protected static HttpEntity mockHttpEntity;





@BeforeClass
public static void setup() throws ClientProtocolException, IOException {
    mockHttpGet = Mockito.mock(HttpGet.class);
    mockHttpClient = Mockito.mock(HttpClient.class);
    mockHttpResponse = Mockito.mock(HttpResponse.class);
    mockStatusLine = Mockito.mock(StatusLine.class);
    mockHttpEntity = Mockito.mock(HttpEntity.class);

    Mockito.when(mockHttpClient.execute(Mockito.isA(HttpGet.class))).thenReturn(mockHttpResponse);
    Mockito.when(mockHttpResponse.getStatusLine()).thenReturn(mockStatusLine);
    Mockito.when(mockStatusLine.getStatusCode()).thenReturn(HttpStatus.SC_OK);
    Mockito.when(mockHttpResponse.getEntity()).thenReturn(mockHttpEntity);

}


@Test
underTest = new UnderTest(initialize with fake API (api));
//Trigger method to test

这给了我一个错误：

java.net.UnknownHostException: api: nodename nor servname provided, or not known

为什么不像设置中那样模拟 'client.execute(get)' 调用？

Answer 1

你目前拥有的是：

mockHttpClient = Mockito.mock(HttpClient.class);
Mockito.when(mockHttpClient.execute(Mockito.isA(HttpGet.class))).thenReturn(mockHttpResponse)

所以有一个 mock 应该对 execute().

的调用做出反应

然后你有：

1) underTest = new UnderTest(initialize with fake API (api));
2) // Trigger method to test

问题是：您的设置中的第 1 行或第 2 行有问题。但是我们不能告诉你；因为您没有向我们提供该代码。

问题是：为了使您的 mock 对象可用，它需要被 [=23=使用 ]underTest不知何故。因此，当您以某种方式错误地执行 init 时，underTest 不会使用模拟的东西，而是一些 "real" 东西。

使用 mockito 模拟 HttpClient 请求

Mocking HttpClient requests with mockito

junit

unit-testing

httpclient

mockito

unknown-host