public async Task should_save_refresh_token_and_return_repositorys_token() { // given string expectedToken = "refresh"; string email = "*****@*****.**"; string ipAddress = "127.1.2.3"; _refreshTokenRepository.AddRefreshToken(email, Arg.Any <string>(), ipAddress) .Returns(new UserRefreshToken() { RefreshToken = expectedToken }); // when string token = await _service.CreateRefreshToken(email, ipAddress); // then token.ShouldBe(expectedToken); }