Go test coverage in VS Code

README.md

Requirements

• Coverage Gutters: vscode extension to display language-agnostic coverage from lcov reports
• Reflex: to watch files and perform actions on change
• gcov2lcov: to convert from Go's coverage report format to lcov
• gotest: optional, you could just use go test

Usage

The path to what you want to test is required.

The rest is optional, but you can pass whatever you'd pass to go test.

# Watch and test all packages
retest ./...

# Watch and test a specific path
retest ./tokenizer

# Watch and test a subset of tests
retest -run=TestSomething/Foo ./tokenizer

retest.fish

function retest
  set coverage_folder "./.coverage"
  set coverage_output "$coverage_folder/cover.out"
  set lcov_path "$coverage_folder/lcov.info"
  set default_test_flags "-v -count=1"

  set cmd_prepare_folder "mkdir -p $coverage_folder"
  set cmd_run_tests "(gotest -cover -covermode=count -coverprofile=$coverage_output -coverpkg=./... $default_test_flags $argv[1..-1] || true)"
  set cmd_print_total "go tool cover -func=$coverage_output | tail -1 | awk '{printf \"%s   %s   %s\\n\", \$1, \$2, \$3}'"
  set cmd_convert_report "gcov2lcov -infile $coverage_output -outfile $lcov_path"

  reflex -s --decoration=none -r "\\.(go|yml)\$" -- sh -c "clear \
&& $cmd_prepare_folder \
&& $cmd_run_tests \
&& $cmd_print_total \
&& echo Converting coverage... \
&& $cmd_convert_report \
&& echo Done."
end