org.mockito

Class BDDMockito

java.lang.Object

org.mockito.ArgumentMatchers

org.mockito.Mockito

org.mockito.BDDMockito

public class BDDMockito
extends Mockito

Behavior Driven Development style of writing tests uses //given //when //then comments as fundamental parts of your test methods. This is exactly how we write our tests and we warmly encourage you to do so!

Start learning about BDD here: https://en.wikipedia.org/wiki/Behavior-driven_development

The problem is that current stubbing api with canonical role of when word does not integrate nicely with //given //when //then comments. It's because stubbing belongs to given component of the test and not to the when component of the test. Hence BDDMockito class introduces an alias so that you stub method calls with given(Object) method. Now it really nicely integrates with the given component of a BDD style test!

Here is how the test might look like:

 import static org.mockito.BDDMockito.*;

 Seller seller = mock(Seller.class);
 Shop shop = new Shop(seller);

 public void shouldBuyBread() throws Exception {
   //given
   given(seller.askForBread()).willReturn(new Bread());

   //when
   Goods goods = shop.buyBread();

   //then
   assertThat(goods, containBread());
 }
 

Stubbing voids with throwables:

   //given
   willThrow(new RuntimeException("boo")).given(mock).foo();

   //when
   Result result = systemUnderTest.perform();

   //then
   assertEquals(failure, result);
 

For BDD style mock verification take a look at BDDMockito.Then in action:

   person.ride(bike);
   person.ride(bike);

   then(person).should(times(2)).ride(bike);
   then(person).shouldHaveNoMoreInteractions();
   then(police).shouldHaveZeroInteractions();
 

It is also possible to do BDD style InOrder verification:

   InOrder inOrder = inOrder(person);

   person.drive(car);
   person.ride(bike);
   person.ride(bike);

   then(person).should(inOrder).drive(car);
   then(person).should(inOrder, times(2)).ride(bike);
 

One of the purposes of BDDMockito is also to show how to tailor the mocking syntax to a different programming style.

Since:

1.8.0

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	BDDMockito.BDDMyOngoingStubbing<T> See original OngoingStubbing
static interface	BDDMockito.BDDStubber See original Stubber
static interface	BDDMockito.Then<T> Provides fluent way of mock verification.

Field Summary

Fields inherited from class org.mockito.Mockito

CALLS_REAL_METHODS, RETURNS_DEEP_STUBS, RETURNS_DEFAULTS, RETURNS_MOCKS, RETURNS_SELF, RETURNS_SMART_NULLS

Constructor Summary

Constructors

Constructor and Description
BDDMockito()

Method Summary

Modifier and Type	Method and Description
static <T> BDDMockito.BDDMyOngoingStubbing<T>	given(T methodCall) see original Mockito.when(Object)
static <T> BDDMockito.Then<T>	then(T mock) Bdd style verification of mock behavior.
static BDDMockito.BDDStubber	will(Answer<?> answer) see original Mockito.doAnswer(Answer)
static BDDMockito.BDDStubber	willAnswer(Answer<?> answer) see original Mockito.doAnswer(Answer)
static BDDMockito.BDDStubber	willCallRealMethod() see original Mockito.doCallRealMethod()
static BDDMockito.BDDStubber	willDoNothing() see original Mockito.doNothing()
static BDDMockito.BDDStubber	willReturn(Object toBeReturned) see original Mockito.doReturn(Object)
static BDDMockito.BDDStubber	willReturn(Object toBeReturned, Object... toBeReturnedNext) see original Mockito.doReturn(Object, Object...)
static BDDMockito.BDDStubber	willThrow(Class<? extends Throwable> toBeThrown) see original Mockito.doThrow(Class)
static BDDMockito.BDDStubber	willThrow(Class<? extends Throwable> toBeThrown, Class<? extends Throwable>... throwableTypes) see original Mockito.doThrow(Class)
static BDDMockito.BDDStubber	willThrow(Throwable... toBeThrown) see original Mockito.doThrow(Throwable[])

Methods inherited from class org.mockito.Mockito

after, atLeast, atLeastOnce, atMost, atMostOnce, calls, clearAllCaches, clearInvocations, description, doAnswer, doCallRealMethod, doNothing, doReturn, doReturn, doThrow, doThrow, doThrow, framework, ignoreStubs, inOrder, lenient, mock, mock, mock, mock, mockConstruction, mockConstruction, mockConstruction, mockConstruction, mockConstruction, mockConstruction, mockConstructionWithAnswer, mockingDetails, mockitoSession, mockStatic, mockStatic, mockStatic, mockStatic, never, only, reset, spy, spy, timeout, times, validateMockitoUsage, verify, verify, verifyNoInteractions, verifyNoMoreInteractions, when, withSettings

Methods inherited from class org.mockito.ArgumentMatchers

any, any, anyBoolean, anyByte, anyChar, anyCollection, anyDouble, anyFloat, anyInt, anyIterable, anyList, anyLong, anyMap, anySet, anyShort, anyString, argThat, booleanThat, byteThat, charThat, contains, doubleThat, endsWith, eq, eq, eq, eq, eq, eq, eq, eq, eq, floatThat, intThat, isA, isNotNull, isNull, longThat, matches, matches, notNull, nullable, refEq, same, shortThat, startsWith

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BDDMockito

public BDDMockito()

Method Detail

given

public static <T> BDDMockito.BDDMyOngoingStubbing<T> given(T methodCall)

see original Mockito.when(Object)

Since:

1.8.0

then

public static <T> BDDMockito.Then<T> then(T mock)

Bdd style verification of mock behavior.

   person.ride(bike);
   person.ride(bike);

   then(person).should(times(2)).ride(bike);
 

Since:

1.10.0

See Also:

Mockito.verify(Object), Mockito.verify(Object, VerificationMode)

willThrow

public static BDDMockito.BDDStubber willThrow(Throwable... toBeThrown)

see original Mockito.doThrow(Throwable[])

Since:

2.1.0

willThrow

public static BDDMockito.BDDStubber willThrow(Class<? extends Throwable> toBeThrown)

see original Mockito.doThrow(Class)

Since:

1.9.0

willThrow

public static BDDMockito.BDDStubber willThrow(Class<? extends Throwable> toBeThrown,
                                              Class<? extends Throwable>... throwableTypes)

see original Mockito.doThrow(Class)

Since:

1.9.0

willAnswer

public static BDDMockito.BDDStubber willAnswer(Answer<?> answer)

see original Mockito.doAnswer(Answer)

Since:

1.8.0

will

public static BDDMockito.BDDStubber will(Answer<?> answer)

see original Mockito.doAnswer(Answer)

Since:

2.1.0

willDoNothing

public static BDDMockito.BDDStubber willDoNothing()

see original Mockito.doNothing()

Since:

1.8.0

willReturn

public static BDDMockito.BDDStubber willReturn(Object toBeReturned)

see original Mockito.doReturn(Object)

Since:

1.8.0

willReturn

public static BDDMockito.BDDStubber willReturn(Object toBeReturned,
                                               Object... toBeReturnedNext)

see original Mockito.doReturn(Object, Object...)

Since:

2.1.0

willCallRealMethod

public static BDDMockito.BDDStubber willCallRealMethod()

see original Mockito.doCallRealMethod()

Since:

1.8.0