Java 如何使用 PowerMock 模拟 Thread.sleep()？
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How to mock Thread.sleep() with PowerMock?
提问by kevinarpe
How to mock Thread.sleep() with PowerMock?
如何使用 PowerMock 模拟 Thread.sleep()？
Sample interface and class:
示例接口和类：
public interface Machine {
void sleep(long millis);
}
public class MachineImpl
implements Machine {
private static final Logger logger = Logger.getLogger(MachineImpl.class);
@Override
public void sleep(long millis) {
try {
if (millis > 0) {
logger.trace(String.format("Try to sleep for %d millis...", millis));
Thread.sleep(millis);
}
}
catch (InterruptedException e) {
logger.trace("Full exception", e);
}
}
}
采纳答案by kevinarpe
This took me a while to figure out, so I am answering my own question.
这花了我一段时间才弄明白，所以我正在回答我自己的问题。
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mockito;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;
@RunWith(PowerMockRunner.class) // important
@PrepareForTest(MachineImpl.class) // important: do not use Thread.class here
public class MachineImplTest {
private MachineImpl classUnderTest;
@Before
public void beforeEachTest() {
classUnderTest = new MachineImpl();
}
@Test
public void sleep_Pass() {
classUnderTest.sleep(0);
classUnderTest.sleep(-100);
classUnderTest.sleep(+100);
}
@Test
public void sleep_Pass2() {
// We do not want to mock all methods, only specific methods, such as Thread.sleep().
// Use spy() instead of mockStatic().
PowerMockito.spy(Thread.class);
// These two lines are tightly bound.
PowerMockito.doThrow(new InterruptedException()).when(Thread.class);
Thread.sleep(Mockito.anyLong());
classUnderTest.sleep(0);
classUnderTest.sleep(-100);
classUnderTest.sleep(+100);
}
}
回答by Dorus
This was helpfull. I did end up using something slightly different. I use EasyMock instead of Mockito.
这很有帮助。我确实最终使用了一些稍微不同的东西。我使用 EasyMock 而不是 Mockito。
@RunWith(PowerMockRunner.class)
@PrepareForTest({ClassUnderTest.class})
public class MyTest {
@Before
public void setUp() {
PowerMock.mockStatic(Thread.class, methods(Thread.class, "sleep"));
Thread.sleep(anyLong());
EasyMock.expectLastCall().anyTimes();
}
}
No need to use Thread.classin @PrepareForTest.
无需Thread.class在@PrepareForTest.
