Question

我是Mockito的新手，我在Eclipse中使用它和JUnit4。我试图模仿我的方法如下： CartLine line = mock(CartLine.class); 然后我得到：FileNotFoundException由所谓的模拟方法的调用引起，如下面的堆栈跟踪所示。这是预期的行为？我正在使用Mockito来避免使用整个环境。

堆栈追踪：

java.io.FileNotFoundException: cart.properties (file not found)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at com.mycompany.cart.util.ResourceFactory.getFileInputStream(ResourceFactory.java:119)
at com.mycompany.cart.util.ResourceFactory.getProperties(ResourceFactory.java:295)
at com.mycompany.cart.CartSettings.tryLoadSettings(CartSettings.java:215)
at com.mycompany.cart.CartSettings.<init>(CartSettings.java:72)
at com.mycompany.cart.CartSettings.<clinit>(CartSettings.java:60)
at com.mycompany.cart.CartLine.<clinit>(CartLine.java:59)
at sun.reflect.GeneratedSerializationConstructorAccessor4.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at org.objenesis.instantiator.sun.SunReflectionFactoryInstantiator.newInstance(SunReflectionFactoryInstantiator.java:40)
at org.objenesis.ObjenesisBase.newInstance(ObjenesisBase.java:59)
at org.mockito.internal.creation.jmock.ClassImposterizer.createProxy(ClassImposterizer.java:128)
at org.mockito.internal.creation.jmock.ClassImposterizer.imposterise(ClassImposterizer.java:63)
at org.mockito.internal.creation.jmock.ClassImposterizer.imposterise(ClassImposterizer.java:56)
at org.mockito.internal.creation.CglibMockMaker.createMock(CglibMockMaker.java:23)
at org.mockito.internal.util.MockUtil.createMock(MockUtil.java:26)
at org.mockito.internal.MockitoCore.mock(MockitoCore.java:51)
at org.mockito.Mockito.mock(Mockito.java:1243)
at org.mockito.Mockito.mock(Mockito.java:1120)
at com.redacted.ml.TestConfToJasper.mockCartLine(TestConfToJasper.java:173)
at com.redacted.ml.TestConfToJasper.mockCartLines(TestConfToJasper.java:131)
at com.redacted.ml.TestConfToJasper.testBuildUCSElement(TestConfToJasper.java:75)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
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)
1249 [main] WARN com.redacted.cart.util.ResourceFactory  - Can not find property file:   cart.properties
1249 [main] FATAL com.redacted.cart.CartSettings  - Can not load cart properties!

编辑：以下是完整的测试代码：

private static final CartLine mockCartLine(LineType type) {
    CartLine line = mock(CartLine.class);
    when(line.getLineType()).thenReturn(type);
    return line;
}

呼叫：

private static final CartLine[] mockCartLines() {
    CartLine[] lines = new CartLine[10];
    int i=0;

    lines[i++] = mockCartLine(LineType.FO);
            [...]   
    return lines;
}

呼叫：

@Test
public void testBuildUCSElement() {
    ConfToJasper ctj = new ConfToJasper(confML);

    CartController controller = mock(CartController.class);
    CartDataObject dataObject = mock(CartDataObject.class);
    CartLine[] lines = mockCartLines();
[...]
}

（我不是此代码的创建者）

Answer 1

在我看来，你的CartLine中有一些静态初始化程序试图打开文件流。

我强烈建议您通过删除这种静态初始化程序逻辑来清理代码以使其单元测试友好。（通常更适合使用实例方法）

或者您的测试资源中可能有一个虚拟的`cart.properties1，以便您的CartLine可以读取它。

或者您可以考虑使用PowerMock来查看它是否有助于避免此类问题（我怀疑无论如何......）

Mockito：mock（）调用真正的方法

1 个答案: