Method coverage

lib/internal/test_runner/tests_stream.js:152–159

(nesting, loc, summary)

  }

  coverage(nesting, loc, summary) {
    this[kEmitMessage]('test:coverage', {
      __proto__: null,
      nesting,
      summary,
      ...loc,
    });
  }

  summary(nesting, file, success, counts, duration_ms) {
    this[kEmitMessage]('test:summary', {