Added Stryker Mutator Tool

[roma2023]

Description:

Successfully installed the StrykerJS tool.

StrykerJS is a mutation testing framework designed for JavaScript projects. It helps ensure code quality by introducing small changes (mutants) and verifying if your tests can detect these changes. This ensures your tests are robust and that untested parts of your code are exposed. StrykerJS supports projects using TypeScript, React, Angular, VueJS, Svelte, and NodeJS.

The current version installed is 8.6.

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How to use StrykerJS:
In order to run Stryker to mutation test use the following command:
npx stryker run

You can also try running with trace logging as follows:
npx stryker run --logLevel trace

Files Installed:
When installing Stryker the following 2 files were created/modified, .gitignore and stryker.config.json. Later, I copied the stryker dependency from the local package.json into install/package.json to pipeline the stryker installation into the installation of NodeBB packages.

Testing:
We used stryker to run the codebase, the results can be seen in the screenshot below. It identified that 548 of 11026 file(s) to be mutated, and highlighted some of the errors.

[coveralls]

Pull Request Test Coverage Report for Build 11501325897

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.002%) to 82.692%

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Files with Coverage Reduction	New Missed Lines	%
src/meta/errors.js	1	81.4%

Totals
Change from base Build 11482150737:	-0.002%
Covered Lines:	22352
Relevant Lines:	25612

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💛 - Coveralls

[Abdallah-Abdaljalil]

It passes the tests, the tool looks like it works, and it looks great to me.