The Mocha testing framework provided as a NodeJs module and a browser script makes asynchronous testing simple and fun. In addition, the framework's ability to run tests serially allows tests to be flexible and accurate without sacrificing speed or accuracy.
Note: You can also run your Mocha.js test scripts on LambdaTest cloud.
Mocha provides a way to write a structured code for testing the applications thoroughly, classifying them into test suites and test cases. Mapping errors to corresponding test cases allows us to produce a test report after the run.
Mocha supports any number of test interfaces, including TSS, Exports, QUnit, and Require. The default interface is a behavior-driven development (BDD), which aims to help developers build software that is predictable, resilient to changes, and not error-prone.
Check out The State of JS 2021 Mocha.js testing data on the basis of developer Satisfaction, Interest, Usage and Awareness.
Since 2016, Mocha has shown a constant decrease in the percentage of satisfying the testers and developer community. The level of satisfaction has dropped from 94% in 2016 to 69% in 2021.
The percentage of interest shown by the tester and developer community for using Mocha has also shown a significant drop over the last 5 years. The percentage has dropped from 75% in 2016 to 45% in 2021.
The change in the level of usage of Mocha among testers hasn’t shown a significant change since its inception. The percentage varies from 49% in 2016 to 50% in 2021.
The percentage of awareness about Mocha among the tester community has seen a slight increase, indicating growth potential i.e., from 89% in 2016 to 90% in 2021.
As per the experience over time section, the overall interest among the tester community to use Mocha has seen a constant downfall in the last 5 years. There is also a decrease in the percentage of testers who would like to use Mocha again, from 45.6% in 2016 to 34.6% in 2021.
Assertions are Boolean functions that test behavior. A true result from an assertion indicates that the expected behavior occurred when the test ran. Jasmine includes a library of assertions that use an expect-style syntax. While Mocha does not have a built-in assertion library, developers can use the popular Chai assertion library, which uses a syntax similar to Jasmine.
Test double frameworks, such as Jasmine, create test doubles. A test double, or spy, is like a clone of an object. It has the same functions as the original object. However, those functions are "stubbed out," meaning they don't do anything. The "stubbed" functions exist so the test double framework can "watch" the double in action, tracking calls to its functions. Mocha does not include a spy framework, but SinonJS is a popular choice for creating spies.
In conclusion, Jasmine comes with assertions and spies, but it doesn’t necessarily make it a better option than Mocha. Mocha focuses on BDD test definitions and does so very well, but other best-of-breed frameworks combine with Mocha to extend its functionality.
To make an informed choice, try both Mocha and Jasmine. Your particular application, and the needs of the test suite will make one option clear as you experiment. You can use either library on its own, but to keep your tests consistent and readable, we recommend combining Mocha or Jasmine with Chai and Sinon within an application.
Mocha.js is compatible with all major browsers, including:
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Our detailed Mocha.js tutorials will help you develop a better functional understanding of the Mocha.js framework. Finally, kick-start your Mocha.js automation journey by running your first Mocha.js test script on the LambdaTest cloud.