VS Code NYC test coverage example

An example on how to get test coverage with NYC for VS Code extensions.

Features

• GUI to pick a test suite files
• Preselect

  • Preselects currently open module's .test.ts suite file

    

  • Preselects currently open .test.ts suite file

    

Additions to 'yo code' template

• Added nyc to devDependencies

  npm install --save-dev nyc
  

• Added npm: pretest task which is used by 'Extension Tests (Coverage)' configuration

• Added Extension Tests (Select) configuration

  • Shows GUI to pick a test suite files
  • Preselects with currently open file

• Added Extension Tests (Coverage) configuration

  • Shows GUI to pick a test suite files
  • Preselects with currently open file
  • Generates a test coverage report

• Added nyc-coverage-test-runner.ts

These additions make it easier to see coverage report in isolation.

For example:

Running test coverage for module-c in this example will show 100% coverage.

While running test coverage for module-a & module-b will show

as their test suites are missing some branches.

Known Issues

Coverage report will be empty with * as one of the activationEvents in package.json.