How To Test Java Script – Give your users a seamless experience by testing on over 3000 real devices and browsers. Don’t compromise with emulators and simulators
How To Test Java Script
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A test library is a piece of software that helps us test our code to make sure it works as intended. An example of an experimental library is Jest by Facebook. We’ll borrow the structure of how to write mock tests.
As you can see from the structure, nothing fancy, just features. We will use assert in expected function.
Assert.deepStrictEqual :- Asserts that two objects or their sub-objects are equal, an error will occur if they are equal
We need a way to see the failure and success states when the tests pass or fail. We’ll just use a simple one
I am a strong believer that you learn by doing. I have left a few things that you can use to practice. There are many things you can do to make it better and here are two to get you started.
Take your time to run the two features and when you’re done contact me on twitter for a review. And if you have difficulty, you can contact me, I will be happy to help.
If you found this post helpful, give it a thumbs up and share it so others can find it. You can follow me
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Testing the code we write is very important at work. While there are teams that don’t test at all, this is one of the most important parts of a successful delivery.
There are many approaches to software testing. One of my favorites is TDD, which stands for test-based elopment. The reason it stands out is because it reverses the natural flow (or so it seems) of writing logic first and then testing. This approach is first experimental, then logical.
At first, this may seem strange. Why testing something doesn’t work? Why explicitly check? Think differently, think about setting requirements and assumptions for your code. When you are given a task, it forces you to break it down into the smallest possible pieces and write down assumptions for it.
Take a Fibonacci sequence generator as an example. The goal is to create a function that accepts one parameter and will return an array of numbers. Very simple. What should we check?
Take a look at that list. Six cases. Well, six cases, not six lines of text. These are easily switched to a test. Observe:
One of the most important things in TDD is creating a cycle for yourself. It consists of three stages –
At the end of the cycle, your code should be tested and coded against current (project) standards. Remember that these cycles must be similar, if not the same in length. Test-driven running works nicely with the Pomodoro technique.
The result doesn’t change, but this code looks better. (I know I have to use TCO, but I don’t want to hide the photo).
I won’t write more tests here, you can do it yourself. And you can check your results or get help in my Codesandbox.
I have shown here the basic usage of test driven test run. It gives you a glimpse of how this technique works and the benefits it offers. But to really appreciate it, you have to work with it for a while. And I highly encourage you to do this!
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Tomekbuszewski repeatedly posts content that violates the Community Code of Conduct 👩💻👨💻 because it is harassing, abusive, or spammy. For example, if you want to solve the “Reverse every other word in a string” problem on CodeWar.com, your code must pass the following tests:
Input and output are shown here,