in x-test.js [865:871]
static requestCoverageValue(context) {
context.state.waiting = true;
Promise.race([context.state.coverageValuePromise, context.timeout(5000)])
.then(() => { XTestRoot.check(context); })
.catch(error => { XTestRoot.bail(context, error); });
context.publish('x-test-root-coverage-request');
}