doReturn() is similar to stubbing a method and returns the expected value. But this is used only when when(mock).thenReturn(return) cannot be used.
when-thenReturn is more readable than doReturn(), also doReturn() is not type safe. thenReturn checks method return types and raises compilation error if an unsafe type is passed.
Here is the syntax for using the doReturn() test:
doReturn(value).when(mock).method(argument);
public class DoReturnTest {
@Mock
StockBroker broker;
@Before
public void setUp() {
MockitoAnnotations.initMocks(this);
}
@Test
public void doReturn_is_not_type_safe() throws Exception {
//get Qoute returns double
when(broker.getQoute(isA(Stock.class))).thenReturn(5.00);
//returning string for getQoute…although return type is double
doReturn("string").when(broker).getQoute(isA(Stock.class));
broker.getQoute(new Stock("A1", 40.00));
}
}The following screenshot shows...