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Original file line number Diff line number Diff line change
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@RunWith(MockitoJunitRunner.class)
class FooTest {
@Mock // Same as "someThing = Mockito.mock(SomeThing.class)"
private SomeThing someThing,

private final Foo foo;

@Before
public void setup() throws Exception {
foo = new Foo(); // our instance of Foo we will be testing
foo.setSomeThing(someThing); // we "inject" our mocked SomeThing
}

@Test
public void testFoo() throws Exception {
when(someThing.compute(anyInt()).thenReturn(2); // we define some behavior
assertEquals(2, foo.bar(5)); // test assertion
verify(someThing).compute(7); // verify behavior.
}
}