add integration test

[domsew]

Hello,

I prepared POC of integration test (due to #26). This test checks if syntax checking works, which proves that monaco-editor works with yaml-language-server as expected (which is the main goal of monaco-yaml). I used playwright. To run test:

1. npm i
2. npx playwright install
3. npm run test
4. To understand how it works, you can use npx playwright test --config=test/playwright.config.ts --headed

Let me know if you like it and what can be improved.

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[remcohaszing]

Thanks! I have wanted to add tests for a long time. This really helps a lot! ❤️

I have some small comments, but overall this looks great!

[remcohaszing]

@mhsdesign we may want to add tests for monaco-tailwindcss based on the same setup.

[mhsdesign]

Thanks for the effort @domsew will look into it

[remcohaszing]

I merged it, because it’s already good as-is. I have one follow-up question: Can we get code coverage? I understand this may be complex, given that we build a test project from already bundled sources.

[domsew]

Can we get code coverage?

I believe it is possible and in fact this is a great idea. Playwright supports chromium built in V8 code coverage link, which is awesome feature. It would require to change test build procedure and choose the best possible reporter (unfortunately there is no default one). Furthermore we need to figure out how to exclude dependency code from the analisis. If I have some time, I'll experiment with it a bit.