test: set up test coverage with c8 - #563
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Add a `test:coverage` script that wraps the existing test command with `c8`, and run it in CI so missing coverage is easy to spot. `all: true` surfaces source files with no coverage at all. Ignore the generated `coverage/` directory in git and Prettier; ESLint already ignores it via `.gitignore`.
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Description
Set up test coverage with
c8:test:coveragescript that wraps the existingnpm testcommand withc8.test:coveragein the CI test job so missing coverage is easy to spot.c8via.c8rc.jsonwithall: true(so source files with no coverage at all are still reported) and excludes foreslint.config.js,coverage/,node_modules/, andtest/.coverage/directory in git and Prettier. ESLint already ignores it via.gitignore(includeIgnoreFile).Motivation
Make it easy to identify missing test coverage.
Additional details
c8uses its defaulttextreporter, printing a coverage summary at the end of the test run.Unlike mdn/dex#263, the test exclude is
test/**rather than**/*.test.js, because this repo keeps test helpers (test/helpers.js,test/helpers/db.js) alongside the*.test.jsfiles.Related issues and pull requests
Similar to mdn/dex#263.