如何使用PowerMock / Mockito和TestNG为最终类的（公共）方法编写_spy_？

时间：2013-01-30 17:10:32

标签： java testng mockito powermock

（是的，我知道，有些人认为不得不求助于PowerMock承认失败）

您好，

版本：TestNG 6.8，Mockito 1.9.5和PowerMock 1.5。

尽管谷歌搜索了很长时间，但我找不到一个例子。

相关课程SyntaxProcessor有process()方法进行初步检查，如果此检查通过，则会调用validate()。

在这里，我故意使初步检查失败。我想检查validate()确实从未被调用过。

在@ user1951544的帮助下，我提出了：

@PrepareForTest(SyntaxProcessor.class)
public final class SyntaxProcessorTest
{
    // ....

    @ObjectFactory
    public IObjectFactory getObjectFactory()
    {
        return new PowerMockObjectFactory();
    }

    // ....

    @DataProvider
    public Iterator<Object[]> notSchemas()
    {
        return SampleNodeProvider.getSamplesExcept(NodeType.OBJECT);
    }

    @Test(dataProvider = "notSchemas")
    public void syntaxProcessorYellsOnNonSchemas(final JsonNode node)
        throws ProcessingException
    {
        final ArgumentCaptor<ProcessingMessage> captor
            = ArgumentCaptor.forClass(ProcessingMessage.class);

        final ProcessingReport report = PowerMockito.mock(ProcessingReport.class);
        final JsonSchemaTree tree = new CanonicalSchemaTree(node);
        final ValidationData data = new ValidationData(tree);

        final Map<String, SyntaxChecker> map = Maps.newHashMap();
        final SyntaxProcessor processor = PowerMockito.spy(new SyntaxProcessor(map));

        processor.process(report, data);

        // No PowerMockito.verify()??
        // "any()" is from org.mockito.Matchers
        Mockito.verify(processor, never())
            .validate(any(SyntaxReport.class), any(JsonSchemaTree.class));

        final JsonNode msgNode = captor.getValue().asJson();
        assertEquals(msgNode.get("message").textValue(),
            "document is not a JSON Schema: not an object");
    }
}

遗憾的是，这个测试失败了，堆栈跟踪很大：

java.lang.RuntimeException: java.lang.ExceptionInInitializerError
    at org.testng.internal.MethodInvocationHelper.invokeDataProvider(MethodInvocationHelper.java:143)
    at org.testng.internal.Parameters.handleParameters(Parameters.java:426)
    at org.testng.internal.Invoker.handleParameters(Invoker.java:1383)
    at org.testng.internal.Invoker.createParameters(Invoker.java:1075)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1180)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
    at org.testng.TestRunner.privateRun(TestRunner.java:767)
    at org.testng.TestRunner.run(TestRunner.java:617)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:334)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:329)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291)
    at org.testng.SuiteRunner.run(SuiteRunner.java:240)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1198)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1123)
    at org.testng.TestNG.run(TestNG.java:1031)
    at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:111)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:204)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:175)
    at org.testng.RemoteTestNGStarter.main(RemoteTestNGStarter.java:111)
    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 com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: java.lang.ExceptionInInitializerError
    at org.mockito.internal.exceptions.stacktrace.ConditionalStackTraceFilter.<init>(ConditionalStackTraceFilter.java:17)
    at org.mockito.exceptions.base.MockitoException.filterStackTrace(MockitoException.java:30)
    at org.mockito.exceptions.base.MockitoException.<init>(MockitoException.java:19)
    at org.mockito.exceptions.misusing.MockitoConfigurationException.<init>(MockitoConfigurationException.java:18)
    at org.mockito.internal.configuration.ClassPathLoader.loadImplementations(ClassPathLoader.java:145)
    at org.mockito.internal.configuration.ClassPathLoader.findPluginImplementation(ClassPathLoader.java:110)
    at org.mockito.internal.configuration.ClassPathLoader.findPlatformMockMaker(ClassPathLoader.java:106)
    at org.mockito.internal.configuration.ClassPathLoader.<clinit>(ClassPathLoader.java:59)
    at org.mockito.internal.util.MockUtil.<clinit>(MockUtil.java:21)
    at org.mockito.internal.configuration.injection.scanner.MockScanner.<init>(MockScanner.java:22)
    at org.mockito.internal.configuration.InjectingAnnotationEngine.injectMocks(InjectingAnnotationEngine.java:96)
    at org.powermock.api.mockito.internal.configuration.PowerMockitoInjectingAnnotationEngine.process(PowerMockitoInjectingAnnotationEngine.java:38)
    at org.powermock.api.extension.listener.AnnotationEnabler.injectSpiesAndInjectToSetters(AnnotationEnabler.java:58)
    at org.powermock.api.extension.listener.AnnotationEnabler.beforeTestMethod(AnnotationEnabler.java:53)
    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.powermock.reflect.internal.WhiteboxImpl.performMethodInvocation(WhiteboxImpl.java:2014)
    at org.powermock.reflect.internal.WhiteboxImpl.invokeMethod(WhiteboxImpl.java:744)
    at org.powermock.reflect.Whitebox.invokeMethod(Whitebox.java:415)
    at org.powermock.modules.testng.internal.PowerMockTestNGMethodHandler.injectMocksUsingAnnotationEnabler(PowerMockTestNGMethodHandler.java:72)
    at org.powermock.modules.testng.internal.PowerMockTestNGMethodHandler.invoke(PowerMockTestNGMethodHandler.java:47)
    at com.github.fge.jsonschema.processing.syntax.SyntaxProcessorTest_$$_javassist_0.notSchemas(SyntaxProcessorTest_$$_javassist_0.java)
    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.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:80)
    at org.testng.internal.MethodInvocationHelper.invokeDataProvider(MethodInvocationHelper.java:135)
    ... 26 more
Caused by: java.lang.NullPointerException
    at org.mockito.internal.exceptions.stacktrace.StackTraceFilter.<clinit>(StackTraceFilter.java:21)
    ... 56 more

我也尝试过阅读this page，以使测试扩展PowerMockTestCase，但随后又出现了另一个错误：

java.lang.RuntimeException: Can't invoke method public void com.github.fge.jsonschema.processing.syntax.SyntaxProcessorTest.syntaxProcessorYellsOnNonSchemas(com.fasterxml.jackson.databind.JsonNode) throws com.github.fge.jsonschema.processing.ProcessingException, probably due to classloader mismatch

那么，你怎么写这样的测试？

（编辑：还试图将版本的TestNG，mockito和powermock降级到@ user1951544建议的版本。它适用于他，不适合我......但这次我在两种情况下都得到了第二个更短的例外）< / p>

2 个答案:

答案 0 :(得分：2)

这可以通过PowerMock完成，您必须为单元测试添加2个注释： @RunWith @PrepareForTest 然后用PowerMockito替换Mockito的间谍/模拟方法。

你可以在这里找到一些有用的例子： http://www.smartics.de/archives/1233

最简单的测试可能如下：

@RunWith(PowerMockRunner.class)
@PrepareForTest(MyClass.class)
public class MyClassTest {
    @Test
    public void test(){
        MyClass myClass = PowerMockito.spy(new MyClass());

        myClass.interfaceMethod(some arguments);
        Mockito.verify(myClass,Mockito.never()).otherMethod();              
    }

}

如果是TestNG，必须设置一个合适的ObjectFactory（而不是@RunWith），如http://almirsadikovic.blogspot.fr/2011/07/testng-and-powermockito-powermock.html或Cant mock static functions with powermock-easymock-testng (non-maven project)中的示例

答案 1 :(得分：1)

我找到了第二个问题的解决方法。

似乎这里描述的testng / powermock版本存在某种问题： http://code.google.com/p/powermock/issues/detail?id=414

在我的测试用例中，我将powermock版本更改为1.4.11并将testng更改为6.4并且一切正常：）

狡猾的东西......

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