C#•8mo ago

How do I properly unit test a post request?

    public interface IFacilityService
    {
        Task<Facility> CreateFacilityAsync(Facility facility);
    }

    public interface IFacilityService
    {
        Task<Facility> CreateFacilityAsync(Facility facility);
    }

        public async Task<Facility> CreateFacilityAsync(Facility facility)
        {
            _db.Facilities.Add(facility);
            await _db.SaveChangesAsync();
            return facility;
        }

        public async Task<Facility> CreateFacilityAsync(Facility facility)
        {
            _db.Facilities.Add(facility);
            await _db.SaveChangesAsync();
            return facility;
        }

        [HttpPost("facility")]
        public async Task<IActionResult> CreateFacilityAsync([FromBody] Facility facilityRequest)
        {
            var createdFacility = await _facilityService.CreateFacilityAsync(facilityRequest);
            return Ok(createdFacility);
        }

        [HttpPost("facility")]
        public async Task<IActionResult> CreateFacilityAsync([FromBody] Facility facilityRequest)
        {
            var createdFacility = await _facilityService.CreateFacilityAsync(facilityRequest);
            return Ok(createdFacility);
        }

I am using Xunit and Nsubtitute, with EFC, and SQLite db.

11 Replies

Natty•8mo ago

So far I have:

        [Fact]
        public async Task CreateFacilityAsync_ShouldAddFacilityToDatabase()
        {
            // Arrange
            var newFacility = new Facility { City = "TestCity", Name = "TestName", PhoneNumber = "TestNumber", WebsiteUrl = "TestWebsite" };
            var facilityController = new FacilityController(_facilityService);

            // Act
            await facilityController.CreateFacilityAsync(newFacility);

            // Assert
            await _facilityService.Received().CreateFacilityAsync(Arg.Any<Facility>());
        }

        [Fact]
        public async Task CreateFacilityAsync_ShouldAddFacilityToDatabase()
        {
            // Arrange
            var newFacility = new Facility { City = "TestCity", Name = "TestName", PhoneNumber = "TestNumber", WebsiteUrl = "TestWebsite" };
            var facilityController = new FacilityController(_facilityService);

            // Act
            await facilityController.CreateFacilityAsync(newFacility);

            // Assert
            await _facilityService.Received().CreateFacilityAsync(Arg.Any<Facility>());
        }

But I don't really understand how to test that a new Facility was successfully added...

Saber•8mo ago

if your mocking the service you can't test that because its a mock which does nothing

Natty•8mo ago

Yeah i am mocking it. So what's the proper way to write a unit test for a post request?

Saber•8mo ago

look into WebApplicationFactory

Natty•8mo ago

Ok. For my Get is this correct tho?

        [Fact]
        public async Task GetAllFacilitiesAsync_ShouldReturnListOfAllFacilities_WhenDataIsInDatabase()
        {
            // Arrange
            var expectedFacilities = new List<Facility>
            {
                new() { City = "Houston", Name = "Your Safety", PhoneNumber = "360-555-1234", WebsiteUrl = "www.mycool.com"},
                new() { City = "Atlanta", Name = "Big Measures", PhoneNumber = "320-555-1111", WebsiteUrl = "www.bigmeasure.com"},
            };

            _facilityService.GetAllFacilitiesAsync().Returns(expectedFacilities);
            var facilityController = new FacilityController(_facilityService);

            // Act
            var result = await facilityController.GetAllFacilitiesAsync();

            // Assert
            var actionResult = Assert.IsType<OkObjectResult>(result);
            var model = Assert.IsType<List<Facility>>(actionResult.Value);
            Assert.Equal(expectedFacilities.Count, model.Count);
        }

        [Fact]
        public async Task GetAllFacilitiesAsync_ShouldReturnListOfAllFacilities_WhenDataIsInDatabase()
        {
            // Arrange
            var expectedFacilities = new List<Facility>
            {
                new() { City = "Houston", Name = "Your Safety", PhoneNumber = "360-555-1234", WebsiteUrl = "www.mycool.com"},
                new() { City = "Atlanta", Name = "Big Measures", PhoneNumber = "320-555-1111", WebsiteUrl = "www.bigmeasure.com"},
            };

            _facilityService.GetAllFacilitiesAsync().Returns(expectedFacilities);
            var facilityController = new FacilityController(_facilityService);

            // Act
            var result = await facilityController.GetAllFacilitiesAsync();

            // Assert
            var actionResult = Assert.IsType<OkObjectResult>(result);
            var model = Assert.IsType<List<Facility>>(actionResult.Value);
            Assert.Equal(expectedFacilities.Count, model.Count);
        }

Saber•8mo ago

looks like a completely worthless test to me

Natty•8mo ago

so this applies to get as well? WebAppFactory mentions integration testing. I think this is correct now:

        [Fact]
        public async Task CreateFacilityAsync_ShouldSuccessfullyCreateNewFacility()
        {
            // Arrange
            var newFacility = new Facility { City = "TestCity", Name = "TestName", PhoneNumber = "TestNumber", WebsiteUrl = "TestWebsite" };
            _facilityService.CreateFacilityAsync(newFacility).Returns(newFacility);

            // Act
            var result = await _facilityController.CreateFacilityAsync(newFacility);
            var okObjectResult = (OkObjectResult)result;

            // Assert
            Assert.Equal(newFacility, okObjectResult.Value);
            Assert.Equal(200, okObjectResult.StatusCode);
        }

        [Fact]
        public async Task CreateFacilityAsync_ShouldSuccessfullyCreateNewFacility()
        {
            // Arrange
            var newFacility = new Facility { City = "TestCity", Name = "TestName", PhoneNumber = "TestNumber", WebsiteUrl = "TestWebsite" };
            _facilityService.CreateFacilityAsync(newFacility).Returns(newFacility);

            // Act
            var result = await _facilityController.CreateFacilityAsync(newFacility);
            var okObjectResult = (OkObjectResult)result;

            // Assert
            Assert.Equal(newFacility, okObjectResult.Value);
            Assert.Equal(200, okObjectResult.StatusCode);
        }

Saber•8mo ago

yes, however most people will consider this type of testing completely worthless

null•8mo ago

When unit testing, you should only mock the external dependencies of your system under test. So in your case, _facilityService is the sut and everything else is an external dependency, even the database call. For that matter, any test that contains some kind of I/O, network hop etc. is considered an integration test.

Natty•8mo ago

What is sut? And yeah, I wanted to avoid integration testing here, which I believe this test achieves.

null•8mo ago

system under test

Gaming

Programming

How do I properly unit test a post request?