当junit3在类路径上时，Mockito会失败

Question

我正在做一个有很多遗留junit3测试的项目。我们最近切换到了JUnit 5，并通过junit-vintage运行旧的测试。由于几个原因，我们不能很容易地摆脱junit3依赖，所以它仍然在类路径上(到目前为止还没有引起任何问题)。

在捕获参数差异的测试中使用mockito.verify()时会出现问题：

public class TestTestTest {
    interface Foo {
        void frobnicate(int a);
    }

    @Test
    void testMockito() {
        Foo foo = mock(Foo.class);
        foo.frobnicate(42);
        verify(foo).frobnicate(43);
    }
}

结果：

java.lang.VerifyError: Bad return type
Exception Details:
  Location:
    org/mockito/internal/junit/ExceptionFactory$JUnitArgsAreDifferent.create(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)Ljava/lang/AssertionError; @10: areturn
  Reason:
    Type 'org/mockito/exceptions/verification/junit/ArgumentsAreDifferent' (current frame, stack[0]) is not assignable to 'java/lang/AssertionError' (from method signature)
  Current Frame:
    bci: @10
    flags: { }
    locals: { 'java/lang/String', 'java/lang/String', 'java/lang/String' }
    stack: { 'org/mockito/exceptions/verification/junit/ArgumentsAreDifferent' }
  Bytecode:
    0x0000000: bb00 0259 2a2b 2cb7 0003 b0            


    at org.mockito.internal.junit.ExceptionFactory.canLoadJunitClass(ExceptionFactory.java:33)
    at org.mockito.internal.junit.ExceptionFactory.<clinit>(ExceptionFactory.java:12)
    at org.mockito.internal.exceptions.Reporter.argumentsAreDifferent(Reporter.java:313)
    at org.mockito.internal.verification.checkers.MissingInvocationChecker.checkMissingInvocation(MissingInvocationChecker.java:43)
    at org.mockito.internal.verification.Times.verify(Times.java:37)
    at org.mockito.internal.verification.MockAwareVerificationMode.verify(MockAwareVerificationMode.java:27)
    at org.mockito.internal.handler.MockHandlerImpl.handle(MockHandlerImpl.java:72)
    at org.mockito.internal.handler.NullResultGuardian.handle(NullResultGuardian.java:29)
    at org.mockito.internal.handler.InvocationNotifierHandler.handle(InvocationNotifierHandler.java:35)
    at org.mockito.internal.creation.bytebuddy.MockMethodInterceptor.doIntercept(MockMethodInterceptor.java:63)
    at org.mockito.internal.creation.bytebuddy.MockMethodInterceptor.doIntercept(MockMethodInterceptor.java:49)
    at org.mockito.internal.creation.bytebuddy.MockMethodInterceptor$DispatcherDefaultingToRealMethod.interceptAbstract(MockMethodInterceptor.java:128)
    at test.TestTestTest$Foo$MockitoMock$448839763.setValue(Unknown Source)
    at test.TestTestTest.testMockito(TestTestTest.java:26)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:513)
    at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:115)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:170)
    at org.junit.jupiter.engine.execution.ThrowableCollector.execute(ThrowableCollector.java:40)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:166)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:113)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:58)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$NodeExecutor.lambda$executeRecursively$3(HierarchicalTestExecutor.java:113)
    at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$NodeExecutor.executeRecursively(HierarchicalTestExecutor.java:108)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$NodeExecutor.execute(HierarchicalTestExecutor.java:79)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$NodeExecutor.lambda$executeRecursively$2(HierarchicalTestExecutor.java:121)

潜在原因似乎是链接器错误(ArgumentsAreDifferent是junit4 AssertionError，但不是junit3 AssertionError)

假设我不能摆脱junit3依赖，有没有解决方法？

Answer 1

我在Mockito上也遇到了同样的错误。然而，用com.google.android.tools:dx:1.7代替了JUnit3。但是看起来这个依赖至少包含一些JUnit3的包和类。这里的问题是，Mockito创建了扩展junit.framework.ComparisonFailure的ArgumentsAreDifferent类。在Mockito4中，ComparisonFailure通过中间类扩展了java.lang.AssertionError，这是JUnit所期望的。但是在JUnit 3(和com.google.android.tools:dx)中，ComparisonFailure并没有扩展AssertionError。

我已经修复了它，只是排除了这个依赖，因为我实际上不需要它。不知道如何在您的情况下修复此问题，因为需要JUnit3。可能是类加载顺序之类的。但希望这些信息能对你有所帮助。