Add Automated Tests

[princefishthrower]

Other than doing some smoke tests via the interactive demo site, I have no other testing method currently for the code in this repo 😅

I'm partial to end-to-end testing tools for a project like this (like cypress for example) because our tests can truly observe the changes in document.title and the <link rel="..."> values.

I'm looking for the following:

• End to end test to be written in a tool like Cypress (doesn't have to be Cypress, if you can convince me otherwise)
  • Cycle through all possible option configurations with multiple values
  • Keep tests small so it is easy to see exactly which test is testing what
• I'm also open to unit tests, though less experienced with them. It's also debatable if a repository this size needs them. Then again, perhaps we need them exactly because of the simplicity of the codebase - small changes can potentially break the whole hook.

This PR could potentially expand into multiple PRs - setting up tests first locally, then adding it to a CI / CD process (which also doesn't exist yet 😅 ) etc. etc.

[wsameer]

Adding unit tests gives you better sleep. Also they can be integrated into the CI/CD pipe-line too.

[princefishthrower]

@wsameer sounds good. Do you have a preferred library in mind? (Ideally, one that works well with React + TypeScript)

[wsameer]

@wsameer sounds good. Do you have a preferred library in mind? (Ideally, one that works well with React + TypeScript)
My go-to combo is always JEST + Testing Library

[princefishthrower]

@wsameer - sounds good to me. Do you want to take this one?

[AbhimanyuBahree]

I could give JEST testing library a shot. Will PR if successfull.

[princefishthrower]

@babu1998 - any update here?