如何使用 Mockito 在 Jersey 客户端模拟请求？

Question

我有一个类将 POJO 发布到外部 API。我想测试这个方法。public int sendRequest(Event event) {   Client client = ClientBuilder.newClient();   WebTarget baseTarget = client.target(some url);   Invocation.Builder builder = baseTarget.request();   Response response = builder.post(Entity.entity(event, MediaType.APPLICATION_JSON));   int statusCode = response.getStatus();   String type = response.getHeaderString("Content-Type");  if (Status.Family.SUCCESSFUL == Status.Family.familyOf(statusCode)) {        m_log.debug("The event was successfully processed by t API %s", event);  }  else if (Status.Family.CLIENT_ERROR == Status.Family.familyOf(statusCode)) {      m_log.error("Status code : <%s> The request was not successfully processed by API. %s", statusCode, event);  }  return statusCode; }我写了一个这样的单元测试@Test  public void sendRequest_postAuditEvent_returnOK() {  int statusCode = EventProcessor.sendRequest(event);  assertEquals(Status.OK.getStatusCode(), statusCode); }但这会向 API 发送一个真实的请求。我是 Mockito 的新手。谁能帮我模拟这个请求？编辑：@Mock Client m_client;@Mock WebTarget m_webTarget;@Mock Invocation.Builder m_builder;@Mock Response m_response;@Testpublic void sendRequest_postAuditEvent_returnOK() {  when(m_client.target(anyString())).thenReturn(m_webTarget);  when(m_webTarget.request()).thenReturn(m_builder);  when(m_builder.post(Entity.entity(m_AuditEvent, MediaType.APPLICATION_JSON))).thenReturn(m_response);  when(m_response.getStatus()).thenReturn(Response.Status.BAD_REQUEST.getStatusCode());  assertEquals(Status.BAD_REQUEST.getStatusCode(), m_AuditEventProcessor.sendRequest(m_AuditEvent));}我尝试模拟这些方法，但它不起作用。仍然调用真正的方法。

Answer 1

理想情况下，该类应该Client在其构造函数中使用 a ，这样您就可以在测试时用模拟替换真实的客户端实例。

class EventProcessor {

    private Client client;

    public EventProcessor(Client client) {

        this.client = client;

    }

    public int sendRequest(Event event) {

        WebTarget baseTarget = client.target(some url);

        ...

    }

}

Answer 2

您可以像这篇文章一样使用 powerMockito Mocking static methods with Mockito

如果你可以模拟这个返回的对象 ClientBuilder.newClient() 你可以模拟调用链中的所有其他对象。

PowerMockito.mockStatic(ClientBuilder.class);

BDDMockito.given(ClientBuilder.newClient(...)).willReturn([a Mockito.mock()...]);