java - '非法状态异常 : missing behavior definition for preceeding method call' even though behavior is defined

Question

我从 easymock 和 JUnit 测试用例中得到了一些无法解释的行为。我收到 IllegalStateException:缺少前面方法调用的行为定义:myCollaborator.getCurrentApplyDate() 用法为:expect(a.foo()).andXXX()。我正在使用 easymock 3.1 在正在测试 classUnderTest 的 JUnit 4 测试类中模拟 myCollaborator。

classUnderTest 需要对 myCollaborator 进行两次调用。只需一通电话即可一切正常。我的 JUnit 测试类中的 @Before 设置方法:

@Before
public void setUp() throws Exception {
    mockCollaborator = EasyMock.createMock(MyCollaborator.class);
    classUnderTest = new myObject(mockCollaborator);
    data = new MyDTO();
    // other setup code for data omitted
    EasyMock.expect(mockCollaborator.getCurrentApplyDate()).andReturn(new java.sql.Date(123456789));
    // comment out this expectation for now so it works
    // EasyMock.expect(mockCollaborator.getCurrentBatch()).andReturn("123");
    EasyMock.replay();
}

我正在使用对 myCollaborator 的两次调用来测试 classUnderTest.process() 方法，第二个调用被注释掉，以便它能够工作:

public MyDTO process(MyDTO data) throws Exception {
    // do some stuff to data
    java.sql.Date myDate = myCollaborator.getCurrentApplyDate();
    // do some stuff with myDate and data
    // comment out this call for now so it works
    // String currentBatch = myCollaborator.getCurrentBatch();
    // do some other stuff with currentBatch and data
    return data;
}

一旦我从 process() 方法中取消注释第二个调用(对 myCollaborator.getCurrentBatch() 的调用)，并取消注释来自 JUnit setUp 的期望() 我开始收到上述 IllegalStateException。

未注释的代码不起作用:

@Before
public void setUp() throws Exception {
    mockCollaborator = EasyMock.createMock(MyCollaborator.class);
    classUnderTest = new myObject(mockCollaborator);
    data = new MyDTO();
    // other setup code for data omitted
    EasyMock.expect(mockCollaborator.getCurrentApplyDate()).andReturn(new java.sql.Date(123456789));
    EasyMock.expect(mockCollaborator.getCurrentBatch()).andReturn("123");
    EasyMock.replay();
}

public MyDTO process(MyDTO data) throws Exception {
    // do some stuff to data
    java.sql.Date myDate = myCollaborator.getCurrentApplyDate();
    // do some stuff with myDate and data
    String currentBatch = myCollaborator.getCurrentBatch();
    // do some other stuff with currentBatch and data
    return data;
}

对于这两种方法来说，java.sql.Date 和 String 的返回类型是正确的。这些方法就像听起来一样只是 setter/getter ；他们所做的只是返回实例变量值；这些 getter 方法中不会发生其他处理或方法调用。

JUnit测试方法:

@Test
public void testSomeFunctionality(){
    // alter data to setup this test case
    try {
        data = classUnderTest.process(data);
    } catch (Exception e) {
        // this is line 531, where the IllegalStateException is being caught
        fail("error msg " + e);
    }
    assertTrue(data.getSomeValue() == expectedValue)
}

完整的堆栈跟踪:

java.lang.AssertionError: An unexpected exception has occurred:
java.lang.IllegalStateException: missing behavior definition for the preceding method call:
MyCollaborator.getCurrentApplyDate()
Usage is: expect(a.foo()).andXXX()
at org.junit.Assert.fail(Assert.java:91)
at qualified.package.name.ClassUnderTestTests.testSomeFunctionality(ClassUnderTestTests.java:531)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

我过去曾以这种方式广泛使用过 easymock 和 JUnit，但以前从未遇到过类似的情况。我的同事们也同样陷入了困境，因此，如果有人能够阐明这里发生的事情，就给他们奖励一下猴子业力。

Answer 1

在您的 @Before 示例中，您显示:

EasyMock.replay();

这不应该是:

EasyMock.replay(mockCollaborator);