public async Task GetPaymentTypeAsync_Throws_NotFoundException()
        {
            //Arrange
            var id = 201;

            _fixture.MockPaymentTypeService.Setup(x => x.GetPaymentTypeAsync(It.IsAny <Expression <Func <PaymentType, bool> > >()))
            .Returns <Expression <Func <PaymentType, bool> > >(expression => Task.FromResult(_fixture.PaymentTypes.AsQueryable().FirstOrDefault(expression)));

            var repository = new PaymentTypeRepository(AutoMapperSingleton.Mapper, _fixture.MockPaymentTypeService.Object);

            //Act
            var exception = await Assert.ThrowsAsync <RestException>(() => repository.GetPaymentTypeAsync(id));

            //Assert
            exception.ErrorCode.Should().Be(HttpStatusCode.NotFound);
            exception.ErrorMessage.Should().Be("Payment type not found.");
            exception.ErrorType.Should().Be(HttpStatusCode.NotFound.ToString());
        }
        public async Task GetPaymentTypeAsync_Returns_GetPaymentTypeDto()
        {
            //Arrange
            var id = 1;

            _fixture.MockPaymentTypeService.Setup(x => x.GetPaymentTypeAsync(It.IsAny <Expression <Func <PaymentType, bool> > >()))
            .Returns <Expression <Func <PaymentType, bool> > >(expression => Task.FromResult(_fixture.PaymentTypes.AsQueryable().FirstOrDefault(expression)));

            var repository = new PaymentTypeRepository(AutoMapperSingleton.Mapper, _fixture.MockPaymentTypeService.Object);

            //Act
            var result = await repository.GetPaymentTypeAsync(id);

            //Assert
            result.Should().BeOfType(typeof(GetPaymentTypeDto));
            result.Id.Should().Be(id);
            result.Name.Should().Be("Cash");
            result.CreditPeriod.Should().Be(0);
        }