如何模拟 sun jersey 客户端 post 调用？

Question

这是我的代码

@Service
public class PaymentHandler {
private static final Gson GSON = new Gson();

private static Client webServiceClient = createSslClient(); // function creates a ssl connection

public Response makePayment(String payload) {
    WebResource webResource = webServiceClient.resource(url);

    WebResource.Builder builder = webResource.getRequestBuilder();

    String r = builder
            .type(MediaType.APPLICATION_JSON_TYPE)
            .accept(MediaType.APPLICATION_JSON_TYPE)
            .post(String.class, payload);

    Response response = GSON.fromJson(r, Response.class);
}
}

这是我尝试测试它的方法，但它不起作用，它总是调用支付服务。我无法嘲笑它。

Client client = mock(Client.class );
WebResource webResource = mock(WebResource.class);
WebResource.Builder builder = mock(WebResource.Builder.class);
ClientResponse clientResponse = mock(ClientResponse.class);
when(client.resource(anyString())).thenReturn(webResource);
when(webResource.getRequestBuilder()).thenReturn(builder);

when(builder.type(anyString())).thenReturn(builder);
when(builder.accept(anyString())).thenReturn(builder);
when(builder.post(Matchers.eq(String.class), anyString())).thenReturn("Test");
paymentHandler.makePayment(payload); //assume that I send actual payload

有人可以告诉我如何模拟这个吗？

Answer 1

在您的测试中，我没有看到您将 webServiceClient 替换为模拟版本。

但首先，我相信你最好不要在没有依赖注入的情况下编写 PaymentHandler 这样的代码。它可能只是一个简单的组合，将 webServiceClient 注入 PaymentHandler。没有依赖注入，它不灵活，难以维护，因此不可测试。例如，想象一下，如果初始化这样一个字段需要与外部系统进行一些交互，会发生什么情况。如果没有任何字节码操作库，您将如何测试它？或者您如何轻松地从一个 webServiceClient 迁移到另一个，例如从非 SSL 到 SSL？

尽管存在这些众所周知的问题，但有时我们不得不处理我们无法轻易更改的第 3 方或遗留代码。但是我们想为与 3rd 方代码交互的代码编写测试。出于这个确切的原因，存在一些很酷的测试框架。 PowerMock 就是其中之一，下面是使用它的工作代码：

@RunWith(PowerMockRunner.class)
@PrepareForTest(PaymentHandler.class)
public class PaymentHandlerTest {
    @Test
    public void test() throws Exception {
        //we don't want to initialize the PaymentHandler.class because it might cause some
        //heavy undesirable initilization. E.g. if we had referred to PaymentHandler as a class
        //literal here, then the webServiceClient would've been initializaed with some "real"
        //instance of Client. My PaymentHandler is located in so package. You should specify your
        //fully qualified class' name here
        Class<?> clazz = Thread.currentThread().getContextClassLoader().loadClass("so.PaymentHandler");

        //now the webServiceClient will be null once we initialize the PaymentHandler class
        PowerMockito.suppress(PowerMockito.method(clazz, "createSslClient"));
        Client client = mock(Client.class);

        //here we initialize the PaymentHandler.class and finally mock the webServiceClient
        Whitebox.setInternalState(clazz, "webServiceClient", client);

        PaymentHandler paymentHandler = new PaymentHandler();

        WebResource webResource = mock(WebResource.class);
        WebResource.Builder builder = mock(WebResource.Builder.class);
        when(client.resource(anyString())).thenReturn(webResource);
        when(webResource.getRequestBuilder()).thenReturn(builder);
        //take note of any(MediaType.class) instead of anyString() from your example. As in
        //your PaymentHandler, MediaType is used instead of String
        when(builder.type(any(MediaType.class))).thenReturn(builder);
        when(builder.accept(any(MediaType.class))).thenReturn(builder);
        when(builder.post(Matchers.eq(String.class), anyString())).thenReturn("{}");

        paymentHandler.makePayment("payload");
    }
}

在我的示例中，我使用了以下依赖项：

testCompile group: 'org.powermock', name: 'powermock-api-mockito2', version: '2.0.0'
testCompile group: 'org.powermock', name: 'powermock-module-junit4', version: '2.0.0'

这些是最新版本，但早期版本也可以

Answer 2

下面是我如何模拟它的

@Mock
Client client;

@Mock
WebResource webResource;

@Mock
WebResource.Builder builder;


@Test
public void test() {
ReflectionTestUtils.setField(payeezyHandler,"webServiceClient",client);
Mockito.when(client.resource(anyString())).thenReturn(webResource);
Mockito.when(webResource.getRequestBuilder()).thenReturn(builder);

Mockito.when(builder.type(MediaType.APPLICATION_JSON_TYPE)).thenReturn(builder);
Mockito.when(builder.accept(MediaType.APPLICATION_JSON_TYPE)).thenReturn(builder);
Mockito.when(builder.post(Matchers.eq(String.class),anyString())).thenReturn(fakeResponse());
}

我知道 ReflectionTestUtils 不好用。但是如果你的测试 class 只有一个 public 函数要测试，那么我想没有什么坏处。

如何模拟 sun jersey 客户端 post 调用？

how to mock sun jersey client post calls?

java

junit

unit-testing

mockito

jersey-client