public void Post_Returns_New_Id_When_Created()
{
//Arrange
int expectedId = int.MaxValue;
var vendor = new Vendor {
};
mockService.Setup(m => m.CreateVendor(
It.IsAny <Vendor>()
)).Returns(expectedId);
//Act
ActionResult actionResult = controller.Post(vendor);
//Assert
OkObjectResult result = Assert.IsType <OkObjectResult>(actionResult);
int actualResult = Assert.IsType <int>(result.Value);
Assert.Equal(expectedId, actualResult);
}