Clean mocking for unit tests using NSubstitute in .NET (Core, Framework, Standard)
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Hello everybody I'm Nick and in this .NET tutorial I will show you how you can get started with mocking external dependencies in unit testing using NSubstitute. NSubstitute is, in my opinion, the best mocking framework for unit tests in .NET and I highly recommend it.
NSubstitute detailed documentation: nsubstitute.github.io/help/ge...
In object-oriented programming, mock objects are simulated objects that mimic the behavior of real objects in controlled ways, most often as part of a software testing initiative. A programmer typically creates a mock object to test the behavior of some other object, in much the same way that a car designer uses a crash test dummy to simulate the dynamic behavior of a human in vehicle impacts.
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Are you looking for more training? Check out my "From Zero to Hero: Unit testing in C#" course: nickchapsas.com/p/from-zero-to-hero-unit-testing-in-c
can you share a disccount code may I ask? Thanks.
Excellent introduction to NSubstitue! Not only are your explanations pedagogical, but you also communicate clear and concise intent & flow of information with your code - clear code which speaks for itself. Well done.
I'm just amazed from clear syntax of NSubstitute. Thanks for the video
20 minutes of great training. No fluff, no BS, just enough to solve my problem.
Totally agree that the code looks very clean. I have just started a new project and I am considering to rewrite all my tests using NSubstituite. Keep it up the good job!
This is awesome! Thank you for a great video on Nsubstitute and mocking
Thank you, Sir! Clear, concise and well explained.
Very nice mocking framework. I'm going to try it and probably use it from now on.
This is useful, I will try it tomorrow
Excellent video, Thank You.
GREAT VIDEO. THANK YOU SO MUCH !!
Wow, your presentation has changed so much since you did this video. Still, very informational in light of current events.
Thanks again!
AutoSubstitution with Theories makes testing so much nicer.
Awesome video.
great intro in the framework. But I can't help myself: what most unit test demos show is, that the 1.) the compiler and the framework works 2.) the author can duplicate the behavior in its code into a unit test or the other way around. I would only test stuff that is really of interest. In this case the most important test would be that calling the hand crafted SQL code (which can not be verified at compile time) at least executes and that it executes with a reasonable performance. Unit tests and test driven development should be performed, if only for the reason, that it makes testing new code SO much more efficient. But I can see those management slides that show that we have 10.000 unit test with 1.000.000 lines of code - which suggest the quality has to be great. But it actually doesn't. The tests need to go to the interesting parts and not just consist of a bloat of trivial stuff.
Totally agree. You should test major behaviors, not minor implementation details. The tests shown in the video are basically useless. But they serve as a demo of the framework, which was the intention here of course.
Hey mate, great video.
You should've explained all the CRUD process, not just the read, that would've been awesome mate.
Could you please make a video explaining how to mock the Create and delete process?
I'm new to NSubstitue (coming from Moq), the basic concepts are very well explained, congrats. But I would like you to share your approach on mocking HttpClient because as far as I found out this is not a straight forward process. Thanks for the video.
Great video! One question: how would you pass the Nsubstitute dependencies to your system under test if the SUT were to be instantiated using IClassFixture for parallelization of the test execution?
Nice job Nick, I am wondering how to unit-test transactions in Entity Framework Core with NSubstitute or Moq when I am trying to unit-test a method that include code with _context.BeginTranscnction( ) ?
@Nick Is there a way to test a public access modifier method that has a private access modifier method or static method inside itself?
Thank u
What should do I if I have extension methods (third party library) inside a method that I want to test?
Hi ....is there any way to mock a static method without writing a wrapper or changing the code flow?
Hello, you recently reply to my comment about the triple a's.
I manage to create a snipped but when I insert the snipped, the first line is formatted correctly but the "// act" and "//Assert" are inserted at beginning of the line, in other word these lines doesn't get formatted.
Hi, do you have any sample using Nsubstitute in VB.NET? Thanks for sharing. Best regards!
How to test protected methods?
Hey Nick, Thank you so much for these videos. You really make developers better and more efficient. I have a question on this, Will NSubstitute work with a Refit Interface which doesn't have an in house implementation? Could you clarify on that? I am breaking my head unit testing Refit interfaces with Moq and it doesn't work for me. Thanks in advance!
It would yes. I use Refit with NSubstitude and it works like any other interface.
@@nickchapsas Awesome, thank you!
Is it possible for data access methods in ado.net
Can we used the solution for NUnit?
Nick, did you upload this project to GitHub yet? Trying to look for it but can't find it.
Hey, it is uploaded under NugetPackageTutorials/MockingTutorial/CustomersApi.NSubstitute/
@@nickchapsas Thank you. I've always had a QA team test my application. Now I'm trying to wrap my head around writing Unit Testing but I can't seem to understand testing DB CRUD operation. I understand to test my application algorithm but testing DB CRUD operation just confuses me.
Prediction: next video is about FluentAssertion :)
I don’t know if it’s gonna be the next one because I wanna cover FakeItEasy as well but it will probably be the one after the mocking ones
came here hoping to learn how to use Returns on a void method.
How can we get the source code ?? I desparatly need it.
The source code is available to my Patreons
hi looking for this source code in invited source
It is under NugetPackageTutorials/MockingTutorial/CustomersApi.NSubstitute/
@@nickchapsas I'm sorry I'm new to your channel, Where do I find this path which you have mentioned above?
Man, I was waiting for you to write the test case for Create which you skipped.