public void CountryExistsTestTrue() { //Arrange var countryId = -1; var country = new Country(); countryRepositoryMock.Setup(x => x.GetById(countryId)) .Returns(country).Verifiable("should call getById of GenericRepository"); //Act var isExists = countryService.CountryExists(countryId); //Assert Assert.IsTrue(isExists); unitOfWorkMock.Verify(); countryRepositoryMock.Verify(); }