1

我正在阅读有关 PowerMockito 的文档，它有两个主要示例：

  1. 模拟静态方法
  2. 部分模拟一个类

但我想知道如何模拟使用new. 我正在寻找 Mockitomock方法的 PowerMockito 版本。这应该能够以某种方式new Foo()在我的生产代码中替换为 Mockito mock(Foo.class)。这是我尝试过的：

import com.PowerMockitoProduction;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpMethod;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

import static org.mockito.Matchers.any;
import static org.powermock.api.mockito.PowerMockito.when;


@RunWith(PowerMockRunner.class)
@PrepareForTest(PowerMockitoProduction.class)
public class PowerMockitoTest {

    @Test(expected = UnsupportedOperationException.class)
    public void test() throws Exception {

        HttpClient mock = PowerMockito.mock(HttpClient.class);
        when(mock.executeMethod(any(HttpMethod.class))).thenThrow(UnsupportedOperationException.class);

        new PowerMockitoProduction().createClient();

    }
}

这个测试失败了：

java.lang.Exception: Unexpected exception, expected<java.lang.UnsupportedOperationException> but was<java.lang.IllegalArgumentException>

这是我的生产代码：

package com;

import org.apache.commons.httpclient.HttpClient;

import java.io.IOException;


public class PowerMockitoProduction {

    public void createClient() throws IOException {
        HttpClient client = new HttpClient();
        client.executeMethod(null);
        System.out.println(client);
    }

}

使用我的调试器，我可以看到client不像我预期的那样是模拟的。

我也尝试过使用：

Object mock = PowerMockito.whenNew(HttpClient.class).withNoArguments().getMock();

但由于某种原因，这会返回一个未完全构造的模拟。我也试过这个：

HttpClient mock = PowerMockito.whenNew(HttpClient.class).withNoArguments().thenReturn(mock(HttpClient.class)).getMock();

但这给了我一条ClassCastException线索。那么，用 PowerMockito 完全模拟一个类的正确方法是什么？

与此示例不同，我尝试模拟 HttpClient 的原因是为了verify以后可以调用它。

4

1 回答 1

7

您不需要调用getMock()方法来取回模拟对象。基本上，模拟一个实例HttpClient，将其存储在局部变量中并使用它：

@Test(expected=UnsupportedOperationException.class)
public void test() {
    HttpClient httpClient = mock(HttpClient.class);
    PowerMockito.whenNew(HttpClient.class).withNoArguments().thenReturn(httpClient);
    when(httpClient.executeMethod(any(HttpMethod.class))).thenThrow(UnsupportedOperationException.class);

    new PowerMockitoProduction().createClient();
    verify(httpClient).executeMethod(null);
}
于 2015-02-23T20:52:07.470 回答