feat: view test coverage in editor

[KnorpelSenf]

Deno

• can run tests.
• can generate test coverage reports.
• has an an editor integration (LSP).

It would be amazing if VSCode would display the test coverage right inside the editor.

The line coverage results are very useful when writing tests because they let me easily see which case are covered by tests and which ones are not. However, every time I add a test to cover some more code, I need to run deno test and deno coverage and then reload my browser window.

I am aware that there are third-party tools that should be able to consume the LCOV output and do this, but I would prefer if it would “just work” without any additional configuration.

[bartlomieju]

Seems like a useful feature and I would gladly accept a PR for this, but the core team doesn't have a bandwidth to work on this for a forseeable future.

[KnorpelSenf]

Since you are now focusing on making test coverage more easily accessible, such as via deno coverage --html, would you reconsider this feature request?

[KnorpelSenf]

@bartlomieju how should the user experience be for this? Do people need to run deno test from the command line and then the lsp picks up the output files? I don't want to simply execute the test files in the background all the time in order to update the coverage, that seems too opaque.

[nabby27]

I would like to see this feature, it would be super useful. I have created a $70 bounty for whoever implements it.