public async Task GetById_SpecificSupplier_ShouldReturnASupplier()
{
// Arrange
var supplier = _supplierFixture.GetValidSupplier();
var supplierId = supplier.Id;
var mock = new Mock <ISupplierService>();
mock.Setup(service => service.GetSupplierAndAddressAndProducts(supplierId)).ReturnsAsync(supplier);
// Act
SupplierController controller = new SupplierController(mock.Object);
var actionResult = await controller.GetById(supplierId);
var result = Assert.IsType <ActionResult <SupplierDTO> >(actionResult).Result;
var okResult = result as OkObjectResult;
// Assert
okResult.Value.Should().BeSameAs(supplier);
okResult.StatusCode.Equals(HttpStatusCode.OK);
}