Mockito

Official site

• we can configure our mocked methods with argument matchers

when(flowerService.analyze(anyString())).thenReturn("Flower");

• We can't use argument matchers as a return value, an exact value is required when stubbing calls
• we can't use argument matchers outside of verification or stubbing

Links:

• BDDMockito - JavaDoc
• https://riptutorial.com/mockito/topic/2055/getting-started-with-mockito

BDD-phases:

• given
• when
• then

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());
}