java 使用 PowerMock-Mockito 部分模拟私有方法
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Partial Mock Private Method with PowerMock-Mockito
提问by wlhee
I am new to Mockito and PowerMock. I need to test some legacy code which has a private method I have to mock. I am considering using the private partial mocking feature from PowerMock, I tried to mimic the example from the link, but it failed. I have no idea what's wrong with it. Could you help to check it? Thanks
我是 Mockito 和 PowerMock 的新手。我需要测试一些遗留代码，这些代码有一个我必须模拟的私有方法。我正在考虑使用 PowerMock 的私有部分模拟功能，我试图模仿链接中的示例，但它失败了。我不知道有什么问题。你能帮忙检查一下吗？谢谢
Here's the class to-be-tested:
这是要测试的类：
package test;
public class ClassWithPrivate
{
private String getPrivateString() {
return "PrivateString";
}
private String getPrivateStringWithArg(String s) {
return "PrivateStringWithArg";
}
}
And This is the Test Code:
这是测试代码：
package test;
import static org.mockito.Mockito.*;
import static org.mockito.Matchers.anyString;
import static org.powermock.api.mockito.PowerMockito.when;
import static org.powermock.api.support.membermodification.MemberMatcher.method;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.api.support.membermodification.MemberMatcher;
import org.powermock.modules.junit4.PowerMockRunner;
@RunWith(PowerMockRunner.class)
@PrepareForTest(ClassWithPrivate.class)
public class ClassWithPrivateTest {
@Test
public void testGetPrivateString() {
ClassWithPrivate spy = PowerMockito.spy(new ClassWithPrivate());
PowerMockito.doReturn("Do").when(spy, method(ClassWithPrivate.class, "getPrivateStringWithArg", String.class)).withArguments(anyString());
}
}
EDITWhen I tried to compile the code, it failed with the following errors:
编辑当我尝试编译代码时，它失败并出现以下错误：
ClassWithPrivateTest.java:26: unreported exception java.lang.Exception; must be caught or declared to be thrown
PowerMockito.doReturn("Do").when(spy, method(ClassWithPrivate.class, "getPrivateStringWithArg", String.class)).withArguments(anyString());
^
ClassWithPrivateTest.java:26: unreported exception java.lang.Exception; must be caught or declared to be thrown
PowerMockito.doReturn("Do").when(spy, method(ClassWithPrivate.class, "getPrivateStringWithArg", String.class)).withArguments(anyString());
回答by wlhee
I found out the problem, the test methods expects a exception. After I modified it as follows, it is working fine.
我发现了问题，测试方法需要一个异常。经过我如下修改后，它工作正常。
@RunWith(PowerMockRunner.class)
@PrepareForTest(ClassWithPrivate.class)
public class ClassWithPrivateTest {
@Test
public void testGetPrivateString() throws Exception {
ClassWithPrivate spy = PowerMockito.spy(new ClassWithPrivate());
PowerMockito.doReturn("Do").when(spy, method(ClassWithPrivate.class, "getPrivateStringWithArg", String.class)).withArguments(anyString());
}
}
