使用PowerMock-Mockito的部分模擬私有方法

Question

我是Mockito和PowerMock的新手。 我需要測試一些遺留代碼，它有一個我必須模擬的私有方法。 我正在考慮使用PowerMock的私有部分模擬功能，我試圖模仿鏈接中的示例，但它失敗了。 我不知道它有什么問題。 你能幫忙檢查一下嗎？ 謝謝

這是待測試的類：

package test;

public class ClassWithPrivate
{

     private String getPrivateString() {
       return "PrivateString";
     }

     private String getPrivateStringWithArg(String s) {
       return "PrivateStringWithArg";
     }

 }

這是測試代碼：

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());

    }

}

編輯當我嘗試編譯代碼時，它失敗並出現以下錯誤：

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

我發現了問題，測試方法需要一個例外。 我修改它如下后，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());

   }

}