PowerMock Mockito的部分Mock私有方法

Question

我是Mockito和PowerMock的新手。我需要测试一些遗留代码，它有一个我必须模拟的私有方法。我正在考虑使用PowerMock的私有部分嘲讽功能，我试图从链接中模仿这个例子，但失败了。我不知道它怎么了。你能帮我检查一下吗？感谢

以下是要测试的类：

package test;
public class ClassWithPrivate
{
     private String getPrivateString() {
       return "PrivateString";
     }
     private String getPrivateStringWithArg(String s) {
       return "PrivateStringWithArg";
     }
 }

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());
    }
}

编辑当我试图编译代码时，它失败了，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());

Answer 1

我发现了问题，测试方法预计会出现异常。在我对它进行如下修改后，它运行良好。

@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());
   }
}