refactor: webapi tests now use chai

[JuanM04]

Changes

Now webapi uses test with Chai, the same way all the other packages do. The motivation behind this is that I've always had problems in my computer with the custom implementation of tests and Mocha not detecting any test suite

Testing

Docs

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Latest commit: 27f4f54

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[FredKSchott]

LGTM with tests passing!