java Powermock/mockito 在被告知时不会抛出异常
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Powermock/mockito does not throw exception when told to
提问by Jan-Olav Eide
I would have assumed that the following test should pass, but the exception is never thrown. Any clues ?
我会假设以下测试应该通过，但永远不会抛出异常。任何线索？
@RunWith(PowerMockRunner.class)
@PrepareForTest(StaticService.class)
public class TestStuff {
@Test(expected = IllegalArgumentException.class)
public void testMockStatic() throws Exception {
mockStatic(StaticService.class);
doThrow(new IllegalArgumentException("Mockerror")).when(StaticService.say("hello"));
verifyStatic();
StaticService.say("hello");
}
}
}
回答by Matt Lachman
It's because you are using the doThrow...when syntax incorrectly for static methods. There are a couple different ways to approach this which I've outlined in two separate test methods below.
这是因为您正在使用 doThrow...when 语法错误地用于静态方法。有几种不同的方法可以解决这个问题，我在下面的两个单独的测试方法中概述了这些方法。
@RunWith(PowerMockRunner.class)
@PrepareForTest({StaticService.class})
public class StaticServiceTest {
@Test (expected = IllegalArgumentException.class)
public void testMockStatic1() throws Exception {
String sayString = "hello";
mockStatic(StaticService.class);
doThrow(new IllegalArgumentException("Mockerror")).when(
StaticService.class, "say", Matchers.eq(sayString));
StaticService.say(sayString);
fail("Expected exception not thrown.");
}
@Test (expected = IllegalArgumentException.class)
public void testMockStatic2() throws Exception {
String sayString = "hello";
mockStatic(StaticService.class);
doThrow(new IllegalArgumentException("Mockerror")).when(
StaticService.class);
StaticService.say(Matchers.eq(sayString)); //Using the Matchers.eq() is
//optional in this case.
//Do NOT use verifyStatic() here. The method hasn't actually been
//invoked yet; you've only established the mock behavior. You shouldn't
//need to "verify" in this case anyway.
StaticService.say(sayString);
fail("Expected exception not thrown.");
}
}
For reference, here was the StaticService implementation I created. I don't know if it matches yours but I did verify that the tests pass.
作为参考，这里是我创建的 StaticService 实现。我不知道它是否与您的匹配，但我确实验证了测试通过。
public class StaticService {
public static void say(String arg) {
System.out.println("Say: " + arg);
}
}
See Also
也可以看看
回答by javaPlease42
StaticServiceTest.javawith imports:
带有导入的StaticServiceTest.java：
import static org.junit.Assert.fail;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Matchers;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;
@RunWith(PowerMockRunner.class)
@PrepareForTest({ StaticService.class })
public class StaticServiceTest {
@Test(expected = IllegalArgumentException.class)
public void testMockStatic1() throws Exception {
/* Setup */
String sayString = "hello";
PowerMockito.mockStatic(StaticService.class);
/* Mocks */
PowerMockito.doThrow(new IllegalArgumentException("Mockerror")).when(
StaticService.class, "say", Matchers.eq(sayString));
/* Test */
StaticService.say(sayString);
/* Asserts */
fail("Expected exception not thrown.");
}
@Test(expected = IllegalArgumentException.class)
public void testMockStatic2() throws Exception {
/* Setup */
String sayString = "hello";
PowerMockito.mockStatic(StaticService.class);
/* Mocks */
PowerMockito.doThrow(new IllegalArgumentException("Mockerror")).when(
StaticService.class);
StaticService.say(Matchers.eq(sayString));
/* Test */
StaticService.say(sayString);
/* Asserts */
fail("Expected exception not thrown.");
}
}
StaticService.java
静态服务.java
public class StaticService {
public static void say(String arg) {
System.out.println("Say: " + arg);
}
}
Tests pass fine:
测试通过：
