What is unit testing

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I have a finished project that I submitted yesterday to a client, and this morning he said that he'd like it if I implemented a few Unit Testing Frameworks into the project;
Jest for Unit testing : integration of Jest [ Test Runner ]
Enzyme [ Container UI Test ]
Storybook [ Component UI Test ] ,
redux-saga-tester [ Business Logic and Integration Test]

What I have tried:

<pre>I'm new to unit testing so I'm not quite sure how to use these, and what to use these for (considering my project is already done?). Can somebody please explain to me how I'm supposed to use these, please? 

Mt project is just a simple app made from React Native that uses the Zomato API to retrieve a list of restaurants as well as allows the user to search for restaurants.

Posted 6-Jan-20 10:30am

Member 14708673

Updated 6-Jan-20 11:20am

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2 solutions

Solution 1

Quote:
I'm new to unit testing so I'm not quite sure how to use these

Google is your friend : Unit testing - Wikipedia[^]

Quote:
and what to use these for

It is used to check that your code gives expected results.

Posted 6-Jan-20 11:15am

Patrice T

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Member 14708673 6-Jan-20 20:13pm

but what is the point of that when I can just run the app on a simulator and see everything working completely fine?

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Dave Kreskowiak · Accepted Answer · 2020-01-06T11:20:00

Solution 2

If you didn't design your code with unit testing in mind, you've got a LOT of work to do to add that capability.

You can't just a some uniting module and call it good. Your code has to be written to be testable, and that means writing your code against Interfaces. If you haven't done this, your code is not going to be very testable.

Posted 6-Jan-20 11:20am

Dave Kreskowiak

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Member 14708673 6-Jan-20 18:20pm

damn, so you're saying I may have to start the project all over again?

Dave Kreskowiak 6-Jan-20 18:44pm

Yep.

Member 14708673 6-Jan-20 20:02pm

but what is the point of that when I already know the code is working fine? is there supposed to be something I may be missing?

Dave Kreskowiak 6-Jan-20 21:46pm

When you make changes to the code, the testing makes sure the code is STILL working without you having to go through and manually test it yourself.

Member 14708673 7-Jan-20 0:39am

ahhh I see. So for a finished project it's essentially useless until I decide to add future changes, correct?

Dave Kreskowiak 7-Jan-20 11:03am

No. It also helps during initial development. It's called Test Driven Development. The tests should know how the code is supposed to work and the results that should come back, then you have to make the code (that doesn't exist yet) pass the tests.

F-ES Sitecore 7-Jan-20 4:13am

I agree with Dave, generally unit testing isn't something you can retro-fit without a lot of rework. I'd probably have a look at those frameworks to see if you can retro-fit them, but if you can't then I'd just tell the client that if they wanted unit testing they needed to have specified that upfront.