public void given_a_request_when_ProcessImageUseCase_ExecuteGet_method_is_called_then_it_returns_the_response_object_of_correct_type_and_data()
{
//assert
var request = MatProcessDataHelper.CreateGetProcessImageRequestObject();
var imageKey = ImagePersistingHelper.generateImageKey(request.processType, request.imageId, request.processRef, request.fileExtension);
var expectedBase64ImageString = MatProcessDataHelper.CreatePostProcessImageRequestObject().base64Image;
_mockGateway.Setup(g => g.RetrieveImage(It.Is <string>(obj => obj == imageKey))).Returns(expectedBase64ImageString);
var expectedUsecaseResponse = new GetProcessImageResponse(expectedBase64ImageString, DateTime.Now, request); //The date time is impossible to test equality for, as it will differ in few microseconds from the actual response one. So I set it to DateTime.Min to signify its unimportance.
//act
var usecaseResponse = _processImageUseCase.ExecuteGet(request);
//assert
Assert.IsNotNull(usecaseResponse);
Assert.IsInstanceOf <GetProcessImageResponse>(usecaseResponse);
Assert.AreEqual(expectedUsecaseResponse.Base64Image, usecaseResponse.Base64Image);
Assert.AreEqual(expectedUsecaseResponse.Request.processRef, usecaseResponse.Request.processRef);
Assert.AreEqual(expectedUsecaseResponse.Request.imageId, usecaseResponse.Request.imageId);
//This assertion has an accuracy of 1 second. If time difference between [when expected object was created] and [when actual usecase response was created] is within 1 second, then the times are considered equal. 1 Second is plenty of time for the code in between to run, considering it's using a Mock gateway.
Assert.Less((usecaseResponse.GeneratedAt - expectedUsecaseResponse.GeneratedAt).TotalMilliseconds, 1000);
}
public GetProcessImageResponse ExecuteGet(GetProcessImageRequest request)
{
var imageKey = ImagePersistingHelper.generateImageKey(request.processType, request.imageId, request.processRef, request.fileExtension);
var gatewayResponse = _processImageGateway.RetrieveImage(imageKey);
return(new GetProcessImageResponse(gatewayResponse, DateTime.Now, request));
}
public static ProcessImageData CreateImageDataObject(PostProcessImageRequest request, Base64DecodedData decodedStringData)
{
return(new ProcessImageData()
{
processRef = request.processRef,
imageId = request.imageId,
imageData = decodedStringData,
key = ImagePersistingHelper.generateImageKey(request.processType, request.imageId, request.processRef, decodedStringData.imageExtension)
});
}
public void given_a_request_when_ProcessImageUseCase_ExecuteGet_method_is_called_then_it_calls_the_gateway_with_imageKey_generated_based_on_the_request()
{
//assert
var request = MatProcessDataHelper.CreateGetProcessImageRequestObject();
var imageKey = ImagePersistingHelper.generateImageKey(request.processType, request.imageId, request.processRef, request.fileExtension);
//act
_processImageUseCase.ExecuteGet(request);
//assert
_mockGateway.Verify(g => g.RetrieveImage(It.Is <string>(obj => obj == imageKey)), Times.Once);
}
public void test_that_generated_key_is_correct(string imageId)
{
//arrange
var processRef = faker.Random.Guid().ToString();
var fileExtension = faker.Random.Word();
var processType = faker.Random.Word();
var expectedKey = $"{processType}/{processRef}/{imageId}.{fileExtension}";
//act
var result = ImagePersistingHelper.generateImageKey(processType, imageId, processRef, fileExtension);
Assert.AreEqual(expectedKey, result);
}