blog posts

JavaScript is one of the most important programming languages ​​in the field of the web, which is very popular among developers today. JavaScript unit testing makes your program produce much better quality and greatly reduces the number of program bugs. In JavaScript unit testing, the program is divided into smaller sections, and You can test each section independently to ensure its performance.

JavaScript language

One of the most important and popular languages ​​used in the field of the web is JavaScript. It is important to know that JavaScript is structurally and conceptually similar to Java and that the two languages ​​are similar only in name. In general, programmers usually switch to JavaScript after mastering the HTML  and  CSS languages. Although  HTML  and  CSS  are markup languages, JavaScript is a programming language, and you have to be patient. This language, which is one of the languages ​​of Front and Web, is. In fact, responsible for localizing and executing website processes.

What is Unit Testing?

Unit testing, which is one of the most important parts of programming. Is testing each part of the program code separately. Unit testing is used when we want to ensure the performance of a piece of code written in the program. It may seem like a time-consuming and time-consuming test of a functional unit, but when you look at its importance, you realize that it’s worth the time. With a single test, small parts of the program are checked, and if there is a problem, it is fixed. This will prevent major bugs and inconveniences when completing and running the entire program. In addition, with unit testing, software production time and program testing time are significantly reduced. This is a programmer who tests his code in unit testing, and this has nothing to do with software testers.

Why use a single test?

The most important reason a unit test is used is to reduce program bugs. Some of the most important reasons to use the unit test are:

• The most important application of unit testing is the ability to add other code to the main program. Using the unit test, you can add other code to the main program. And not worry about it being inconsistent with other parts of the program.
• The tests performed will make it easier to understand in the future if you refer to the written code again and to easily identify how to call it, how to value it, and so on.
• If a programmer uses a single test, he will have to split a large program into several small sections that can be independently reviewed. When you run into a problem running the program, you can easily tell if an error has occurred. , Which part of the code does it belongs to.

JavaScript tests are front-end.

As you know,  HTML / CSS code is not a functional language and does not require a single test. In contrast, using a single JavaScript test plays an important role in improving the quality of programs in this language. The role of JavaScript unit testing has received more and more attention since the introduction of Ninety GS and typewriting. The function of the JavaScript unit test is that it receives a unit, the output is displayed, and behavior is returned. Although some projects do not require JavaScript unit testing, developers usually try to use JavaScript unit testing to ensure the program they have written.

The JavaScript unit is usually tested against a single unit, and this unit is usually related to a library or function. The most important goal in testing a JavaScript unit is to examine all aspects of a function to ensure its correctly executed. The TDD and BDD methods are the two most important methods to consider when testing a JavaScript unit. TDD  follows a test-based structure, but  BDD focuses on behaviors. Although these two methods have many similarities, they show completely different functions.

The most important JavaScript unit testing tools

There are several tools to test the JavaScript unit, which speeds up the programming process. Some of the most important tools used in JavaScript unit testing are:

• Jasmine: This framework, which can test the synchronicity and inconsistency of JavaScript code, uses the  BDD software testing process.
• Quit: This framework has a simple design and very high power, and you can use it to test all kinds of JavaScript code.
• Mocha: This framework has a built-in executable for tests and tests code synchronization using the Done () function.
• Tape: Another tool used to test the JavaScript unit. The tests written by this tool cause the output of the results to be included in the  TAP protocol.
• Karma: This tool allows source code executors to use real browsers with a custom interface or  CLI.

Techniques and strategies

Before you test a piece of code using a JavaScript unit test. You need to fully understand it and recognize its role throughout the program. Input testing and user interactions are among the most important scenarios in this topic. Test output should help you identify and fix problems well. All error reports must specify exactly what you are testing. What the outputs were after the test, and what was the expected output for a successful test. Also, one of the most common tests of JavaScript units is shortcodes and basic output response types. There is a function in this discussion that gives the wrong output in the program, and we want to find the cause.

Benefits of JavaScript unit testing

Careful review of how the code works, easy and fast updating of modified code, the ability to share code, evaluate the expectations of the programmer from the program, easier coding, and refactoring, no reappearance of bugs, significant reduction of bug time Finding in JavaScript and fixing program bugs and running multiple tests in a short time are some of the most important benefits of having a single JavaScript test.