本文介绍了使用PowerMock进行每次测试后,模拟行为都会重置的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在使用PowerMock编写单元测试,模拟一些util类的行为。为测试类定义一次行为(通过@BeforeClass注释)会导致:
I'm writing unit tests using PowerMock, mocking behaviour of some util classes. Defining behaviour once for test class (by @BeforeClass annotation) causes:
- 第一次测试调用以返回模拟值
- 第二次测试调用返回实际方法返回值
示例代码:
import org.junit.Assert;
import org.junit.BeforeClass;
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;
@RunWith(PowerMockRunner.class)
@PrepareForTest( {A.class, B.class})
public class TestMockedMethods {
private static B b;
@BeforeClass
public static void setUp() {
PowerMockito.mockStatic(A.class);
PowerMockito.when(A.getVal()).thenReturn("X");
b = PowerMockito.mock(B.class);
PowerMockito.when(b.getVal()).thenReturn("Y");
}
@Test
public void test1() { // PASS
Assert.assertEquals("X", A.getVal());
Assert.assertEquals("Y", b.getVal());
}
@Test
public void test2() { // FAIL
Assert.assertEquals("X", A.getVal()); // actual="A"
Assert.assertEquals("Y", b.getVal()); // actual="B"
}
}
class A {
static String getVal() {
return "A";
}
}
class B {
String getVal() {
return "B";
}
}
为什么第二次测试失败的任何想法?
Any ideas why second test is failing?
推荐答案
方法 PowerMockito.mockStatic(...)
调用 MockCreator.mock(...)
。此方法注册了一个Runnable,将在每次测试后执行 :
The method PowerMockito.mockStatic(...)
invokes MockCreator.mock(...)
. This method regsiters a Runnable that will be executed after each test :
MockRepository.addAfterMethodRunner(new MockitoStateCleaner());
此runnable清除 Mockito的内部状态:
This runnable cleans the internal state of Mockito :
private static class MockitoStateCleaner implements Runnable {
public void run() {
clearMockProgress();
clearConfiguration();
}
private void clearMockProgress() {
clearThreadLocalIn(ThreadSafeMockingProgress.class);
}
private void clearConfiguration() {
clearThreadLocalIn(GlobalConfiguration.class);
}
private void clearThreadLocalIn(Class<?> cls) {
Whitebox.getInternalState(cls, ThreadLocal.class).set(null);
final Class<?> clazz = ClassLoaderUtil.loadClass(cls, ClassLoader.getSystemClassLoader());
Whitebox.getInternalState(clazz, ThreadLocal.class).set(null);
}
}
所以你应该在每次测试之前执行你的setUp。 / p>
So you should execute your setUp before each test.
@Before
public void setUp() {
PowerMockito.mockStatic(A.class);
PowerMockito.when(A.getVal()).thenReturn("X");
b = PowerMockito.mock(B.class);
PowerMockito.when(b.getVal()).thenReturn("Y");
}
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