Function captureAssertion

scripts/jest/reactTestMatchers.js:6–20

(fn)

const SchedulerMatchers = require('./schedulerTestMatchers');

function captureAssertion(fn) {
	// Trick to use a Jest matcher inside another Jest matcher. `fn` contains an
	// assertion; if it throws, we capture the error and return it, so the stack
	// trace presented to the user points to the original assertion in the
	// test file.
	try {
		fn();
	} catch (error) {
		return {
			pass: false,
			message: () => error.message
		};
	}
	return { pass: true };
}

function assertYieldsWereCleared(Scheduler) {
	const actualYields = Scheduler.unstable_clearYields();