public async Task GetSampleByIdShouldGetSample()
        {
            var sampleId = 1;
            var sample   = new Sample {
                Id = sampleId
            };

            _projectBLMock.Setup(x => x.GetSampleByIDAsync(It.IsAny <int>())).Returns(Task.FromResult(sample));
            var sampleController = new SampleController(_projectBLMock.Object);
            var result           = await sampleController.GetSampleByIDAsync(sampleId);

            Assert.Equal(sampleId, ((Sample)((OkObjectResult)result).Value).Id);
            _projectBLMock.Verify(x => x.GetSampleByIDAsync(sampleId));
        }
        public async Task GetSampleByIDAsync_ShouldReturnNotFound_WhenSampleIsInvalid()
        {
            //arrange
            int    id     = -2;
            Sample sample = null;

            _projectBLMock.Setup(i => i.GetSampleByIDAsync(id)).ReturnsAsync(sample);
            SampleController sampleController = new SampleController(_projectBLMock.Object);

            //act
            var result = await sampleController.GetSampleByIDAsync(id);

            //assert
            Assert.IsType <NotFoundResult>(result);
        }