模拟 Apache HttpClient 4.4 PoolingHttpClientConnectionManager答案

【问题标题】：Mocking Apache HttpClient 4.4 PoolingHttpClientConnectionManager模拟 Apache HttpClient 4.4 PoolingHttpClientConnectionManager
【发布时间】：2015-03-12 14:09:24
【问题描述】：

我知道如何模拟 default HttpClient，但如何模拟使用 PoolingHttpClientConnectionManager 和 Mockito 创建的最新 (v4.4) HttpClient？

我的代码如下所示：

PoolingHttpClientConnectionManager mgr = new PoolingHttpClientConnectionManager();
...
CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(mgr).build();
HttpResponse response = httpClient.execute(request);            
... // here I want to substitute a mocked HttpResponse

【问题讨论】：

标签： java mockito apache-httpclient-4.x

【解决方案1】：

模拟HttpRequestExecutor 可能比模拟HttpClientConnection 更容易。您仍然需要提供HttpClientConnectionManager 的无操作实现，以防止 HttpClient 创建和连接套接字

HttpRequestExecutor requestExecutor = Mockito.mock(HttpRequestExecutor.class);
Mockito.when(requestExecutor.execute(
        Mockito.<HttpRequest>any(),
        Mockito.<HttpClientConnection>any(),
        Mockito.<HttpContext>any())).thenReturn(new BasicHttpResponse(HttpVersion.HTTP_1_1, 200, "Hah"));

HttpClientConnectionManager cm = Mockito.mock(HttpClientConnectionManager.class);
HttpClientConnection conn = Mockito.mock(HttpClientConnection.class);
ConnectionRequest connRequest = Mockito.mock(ConnectionRequest.class);
Mockito.when(cm.requestConnection(
        Mockito.<HttpRoute>any(),
        Mockito.any())).thenReturn(connRequest);
Mockito.when(connRequest.get(
        Mockito.anyLong(),
        Mockito.<TimeUnit>any())).thenReturn(conn);

CloseableHttpClient client = HttpClients.custom()
        .setRequestExecutor(requestExecutor)
        .setConnectionManager(cm)
        .build();

CloseableHttpResponse response = client.execute(new HttpGet("http://pampa/"));
try {
    System.out.println(response.getStatusLine());
} finally {
    response.close();
}

【讨论】：

哇，希望少一些嘲弄 :) 但幸运的是，经过一些重构后，我能够像以前一样只模拟 HttpClient。

【解决方案2】：

刚刚意识到PoolingHttpClientConnectionManager 是HttpClient 使用HttpClients.custom().build() 构建的默认连接管理器（至少在v4.4 中），所以我只是回到模拟HttpClient。

protected HttpClient buildHttpClient() {
    return HttpClients.custom()./* other config */.build();
}

单元测试代码：

    @Mock
    HttpClient mockClient;
    @Mock
    HttpResponse mockResponse;
    @Spy
    MyClass myclass = new MyClass();
    . . .
    @Test
    public void myTestCase() {
        . . .
        when(myclass.buildHttpClient()).thenReturn(mockClient);
        when(mockClient.execute(requestCaptor.capture())).thenReturn(mockResponse);
        . . .

【讨论】：