How to mock a builder with mockito

Question

I have a builder:

class Builder{
     private String name;
     private String address;
     public Builder setName(String name){
         this.name = name;
         


        

Answer 1

You can use RETURN_DEEP_STUBS to mock a chaining API.

If you know the exact order your builder will be called, here's an example of how you would use it:

Builder b = Mockito.mock(Builder.class, RETURNS_DEEP_STUBS);
when(b.setName("a name").setAddress("an address")).thenReturn(b);
assert b.setName("a name").setAddress("an address") == b; // this passes

Unfortunately this won't give you a generic way of mocking "all the various builder methods" so that they always return this, see the other answer is you need that.