Contributions are welcome, but since development is so active, we request that you file an issue and claim it before starting to work on something. Otherwise, it is likely that we might already be working on a fix for your issue.
All gopls issues are labeled as such (see the gopls label). Issues that are suitable for contributors are additionally tagged with the help-wanted label.
Before you begin working on an issue, please leave a comment that you are claiming it.
To run tests for just gopls/, run,
cd /path/to/tools/gopls go test ./...
But, much of the gopls work involves internal/lsp too, so you might want to run both:
cd /path/to/tools cd gopls && go test ./... cd .. go test ./internal/lsp/...