Mockito中的Bug与Grails/Groovy

Question

我使用Grails 1.3.7的Mockito 1.9,我有一个奇怪的错误.

以下java中的测试用例:

import static org.mockito.Mockito.*;

public class MockitoTests extends TestCase {

    @Test
    public void testSomeVoidMethod(){
        TestClass spy = spy(new TestClass());
        doNothing().when(spy).someVoidMethod();
    }

    public static class TestClass {

        public void someVoidMethod(){
        }
    }
}

在groovy中的这个测试不起作用:

import static org.mockito.Mockito.*

public class MockitoTests extends TestCase {

    public void testSomeVoidMethod() {
        def testClassMock = spy(new TestClass())
        doNothing().when(testClassMock).someVoidMethod()
    }

}

public class TestClass{

    public void someVoidMethod(){
    }
}

这是错误消息:

only void methods can doNothing()!
Example of correct use of doNothing():
    doNothing().
    doThrow(new RuntimeException())
    .when(mock).someVoidMethod();
Above means:
someVoidMethod() does nothing the 1st time but throws an exception the 2nd time is called
org.mockito.exceptions.base.MockitoException: 
Only void methods can doNothing()!
Example of correct use of doNothing():
    doNothing().
    doThrow(new RuntimeException())
    .when(mock).someVoidMethod();
Above means:
someVoidMethod() does nothing the 1st time but throws an exception the 2nd time is called
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.createPogoSite(CallSiteArray.java:129)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.createCallSite(CallSiteArray.java:146)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:40)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:120)

是否有人观察到同样的错误？

Answer 1

问题是Groovy在它到达之前拦截你的方法调用someVoidMethod.实际调用的方法getMetaClass不是void方法.

您可以通过替换来验证这种情况:

doNothing().when(testClassMock).someVoidMethod()

有:

doReturn(testClassMock.getMetaClass()).when(testClassMock).someVoidMethod()

我不确定你是否能够使用stock Mockito和Groovy 来解决这个问题.