如何模拟使用 PowerMock 进行测试的私有方法? [英] How to mock private method for testing using PowerMock?
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问题描述
我有一个类,我想用一个调用私有方法的公共方法来测试它.我想假设私有方法正常工作.例如,我想要类似 doReturn....when...
的东西.我发现有使用 PowerMock 的可能解决方案,但该解决方案对我不起作用.如何做到?有人遇到过这个问题吗?
I have a class which I would like to test with a public method that calls private one. I'd like to assume that private method works correctly. For example, I'd like something like doReturn....when...
. I found that there is possible solution using PowerMock, but this solution doesn't work for me.
How It can be done? Did anybody have this problem?
推荐答案
我看不出这里有什么问题.通过使用 Mockito API 的以下代码,我设法做到了:
I don't see a problem here. With the following code using the Mockito API, I managed to do just that :
public class CodeWithPrivateMethod {
public void meaningfulPublicApi() {
if (doTheGamble("Whatever", 1 << 3)) {
throw new RuntimeException("boom");
}
}
private boolean doTheGamble(String whatever, int binary) {
Random random = new Random(System.nanoTime());
boolean gamble = random.nextBoolean();
return gamble;
}
}
这是 JUnit 测试:
And here's the JUnit test :
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.anyInt;
import static org.mockito.Matchers.anyString;
import static org.powermock.api.mockito.PowerMockito.when;
import static org.powermock.api.support.membermodification.MemberMatcher.method;
@RunWith(PowerMockRunner.class)
@PrepareForTest(CodeWithPrivateMethod.class)
public class CodeWithPrivateMethodTest {
@Test(expected = RuntimeException.class)
public void when_gambling_is_true_then_always_explode() throws Exception {
CodeWithPrivateMethod spy = PowerMockito.spy(new CodeWithPrivateMethod());
when(spy, method(CodeWithPrivateMethod.class, "doTheGamble", String.class, int.class))
.withArguments(anyString(), anyInt())
.thenReturn(true);
spy.meaningfulPublicApi();
}
}
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