public async Task <long> ShouldBeApplyANewDeveloper() { _developerRepositoryMock.Setup(s => s.Insert(It.IsAny <Developer>())).ReturnsAsync(FakerBuilder.New().Build().Random.Long(0, 10)); var developerDto = _mapper.Map <DeveloperDto>(DeveloperFake.New().Build()); var newId = await _developerService.ApplyADeveloper(developerDto); newId.ShouldNotBe(0); _developerRepositoryMock.Verify(s => s.Insert(It.Is <Developer>(p => p.Email == developerDto.Email))); return(newId); }