Misplaced argument matcher detected here. You cannot use argument matchers outside of verification or stubbing in Mockito

问题:

Out of the following two test cases in BundleProcessorTest.java, i am getting below exception, although, my first test case passes successfully.

org.mockito.exceptions.misusing.InvalidUseOfMatchersException: Misplaced argument matcher detected here:

-> at bundle.test.BundleProcessorTest.bundlePluginShouldNotBeNull(BundleProcessorTest.java:22)

You cannot use argument matchers outside of verification or stubbing. Examples of correct usage of argument matchers: when(mock.get(anyInt())).thenReturn(null); doThrow(new RuntimeException()).when(mock).someVoidMethod(anyObject()); verify(mock).someMethod(contains("foo"))

Also, this error might show up because you use argument matchers with methods that cannot be mocked. Following methods cannot be stubbed/verified: final/private/equals()/hashCode().

at bundle.test.BundleProcessorTest.bundlePluginCollectionShouldNotBeNull(BundleProcessorTest.java:28) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

Please find below simplified code listing :-

BundlePlugin.java

package bundle;  import java.util.List;  public class BundlePlugin {      private final String pluginName ;     private final List<String> featureContent ;      public BundlePlugin(String pluginName, List<String> featureContent) {         super();         this.pluginName = pluginName;         this.featureContent = featureContent;     }      public String getPluginName() {         return pluginName;     }      public List<String> getFeatureContent() {         return featureContent;     } } 

BundleProcessor.java

package bundle;  import java.util.ArrayList; import java.util.Iterator; import java.util.List;  public class BundleProcessor {      public BundlePlugin getBundlePlugin(String pluginName, Iterator<String> artifactIterator) {          List<String> featureContent = new ArrayList<String>() ;          return new BundlePlugin(pluginName, featureContent);     } } 

BundleProcessorTest.java

package bundle.test;  import static org.junit.Assert.assertNotNull; import static org.mockito.Matchers.anyString; import static org.mockito.Mockito.mock;  import java.util.Iterator; import java.util.List;  import org.junit.Test;  import bundle.BundleProcessor;  public class BundleProcessorTest {      BundleProcessor bundleProcessor = new BundleProcessor() ;         @Test     public void bundlePluginShouldNotBeNull() {          Iterator<String> artifactIterator = mock(Iterator.class) ;         bundle.BundlePlugin bundlePlugin = bundleProcessor.getBundlePlugin(anyString(), artifactIterator) ;         assertNotNull( bundlePlugin );     }      @Test     public void bundlePluginContentShouldNotBeNull() {         Iterator<String> artifactIterator = mock(Iterator.class) ;         bundle.BundlePlugin bundlePlugin = bundleProcessor.getBundlePlugin(anyString(), artifactIterator) ;          List<String> featureContent = bundlePlugin.getFeatureContent() ;         assertNotNull( featureContent );     } } 

How to execute this test without problem.

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Edit 1:

But if i mark the bundlePluginCollectionShouldNotBeNull test with @Ignore annotation, then first test case passes without any exception.

回答1:

You are using mockito anyString() while calling the test method, it should be used only for verifying a mock object to ensure a certain method is called with any string parameter inside the test, but not to invoke the test itself. For your test use empty string "" instead to anyString().

文章来源: Misplaced argument matcher detected here. You cannot use argument matchers outside of verification or stubbing in Mockito