mockito-verify
Mockito Verify Cookbook
1. Overview
The format of the cookbook is example focused and practical – no extraneous details and explanations necessary.
We’re going to be mocking a simple list implementation:
public class MyList extends AbstractList<String> {
@Override
public String get(final int index) {
return null;
}
@Override
public int size() {
return 0;
}
}Further reading:
Mocking Exception Throwing using Mockito
Learn to configure a method call to throw an exception in Mockito.
Mockito’s Java 8 Features
Overview of Java 8 support in Mockito framework, including Streams and default interface methods
Mocking of Private Methods Using PowerMock
Learn how PowerMock can be used to extend the capability of Mockito for mocking and verification of private methods in the class under test.
2. The Cookbook
List<String> mockedList = mock(MyList.class);
mockedList.size();
verify(mockedList).size();verify number of interactions with mock
List<String> mockedList = mock(MyList.class);
mockedList.size();
verify(mockedList, times(1)).size();verify no interaction with the whole mock occurred
List<String> mockedList = mock(MyList.class);
verifyZeroInteractions(mockedList);verify no interaction with a specific method occurred
List<String> mockedList = mock(MyList.class);
verify(mockedList, times(0)).size();verify there are no unexpected interactions – this should fail:
List<String> mockedList = mock(MyList.class);
mockedList.size();
mockedList.clear();
verify(mockedList).size();
verifyNoMoreInteractions(mockedList);verify order of interactions
List<String> mockedList = mock(MyList.class);
mockedList.size();
mockedList.add("a parameter");
mockedList.clear();
InOrder inOrder = Mockito.inOrder(mockedList);
inOrder.verify(mockedList).size();
inOrder.verify(mockedList).add("a parameter");
inOrder.verify(mockedList).clear();verify an interaction has not occurred
List<String> mockedList = mock(MyList.class);
mockedList.size();
verify(mockedList, never()).clear();verify an interaction has occurred at least certain number of times
List<String> mockedList = mock(MyList.class);
mockedList.clear();
mockedList.clear();
mockedList.clear();
verify(mockedList, atLeast(1)).clear();
verify(mockedList, atMost(10)).clear();verify interaction with exact argument
List<String> mockedList = mock(MyList.class);
mockedList.add("test");
verify(mockedList).add("test");verify interaction with flexible/any argument
List<String> mockedList = mock(MyList.class);
mockedList.add("test");
verify(mockedList).add(anyString());verify interaction using argument capture
List<String> mockedList = mock(MyList.class);
mockedList.addAll(Lists.<String> newArrayList("someElement"));
ArgumentCaptor<List> argumentCaptor = ArgumentCaptor.forClass(List.class);
verify(mockedList).addAll(argumentCaptor.capture());
List<String> capturedArgument = argumentCaptor.<List<String>> getValue();
assertThat(capturedArgument, hasItem("someElement"));3. Conclusion
This format is an experiment – I’m publishing some of my internal development cookbooks on a given topic – on Google Guava, Hamcrest and now Mockito. The goal is to have this information readily available online – and to add to it whenever I run into a new useful example.
The implementation of all these examples and code snippets can be found on GitHub – this is a Maven-based project, so it should be easy to import and run as it is.
