<dependency> <groupId>org.mockachino</groupId> <artifactId>mockachino</artifactId> <version>1.0.8</version> </dependency> import org.mockachino.Mockachino; import org.mockachino.MockachinoAssert; import org.mockachino.matchers.Matchers; List<String> mockList = Mockachino.mock(List.class); Mockachino.when(mockList.get(0)).thenReturn("Mockachino"); String result = myClassUnderTest.someMethod(mockList);