Setup the test suite

[jneira]

• For now it has a dummy test, testing the configuration works. It compiles and runs the test with
• Will make progress on Create a test suite and setup ci to run them #473

npm test

• Readings:
  • Write "Working with Extensions / Bundling Extension" topic microsoft/vscode-docs#2254
  • https://github.com/microsoft/vscode-extension-samples/blob/main/helloworld-test-sample
  • https://github.com/microsoft/vscode-extension-samples/blob/main/webpack-sample/package.json

[jneira]

Plan for the initial test suite:

• Test the happy path, no the error handling (although it is important too)
• Dont test things already tested in hls (diagnostics, code actions, etc)

[jneira]

Next step is figure out how to test the setup of the server (downloading the wrapper, querying the project ghc version, downloading hls, calling it)

• One alternative could be capture the output channel and wait for some meesage but it seems is not easily accesible see Add ability to read outputChannel text. microsoft/vscode#65108

[jneira]

I think the pr is useful as is, cause it at least compile and check the extension can be activated. Will add more tests in future prs