e6725e15af
This patch introduces a tiny test runner to run puppeteer tests. The test runner is self-container and allows parallel (wrt IO) test execution. It will also allow us to split tests into multiple files if necessary. Comparing to the jasmine, the testrunner supports parallel execution, properly handles "unhandled promise rejection" event and signals. Comparing to ava/jest, the testrunner doesn't run multiple node processes, which makes it simpler but sufficient for our goals.
1.2 KiB
1.2 KiB
TestRunner
- no additional binary required; tests are
node.jsscripts - parallel wrt IO operations
- supports async/await
- modular
- well-isolated state per execution thread
Example
const {TestRunner, Reporter, Matchers} = require('../utils/testrunner');
// Runner holds and runs all the tests
const runner = new TestRunner({
parallel: 2, // run 2 parallel threads
timeout: 1000, // setup timeout of 1 second per test
});
// Simple expect-like matchers
const {expect} = new Matchers();
// Extract jasmine-like DSL into the global namespace
const {describe, xdescribe, fdescribe} = runner;
const {it, fit, xit} = runner;
const {beforeAll, beforeEach, afterAll, afterEach} = runner;
beforeAll(state => {
state.parallel; // this will be set with the execution thread id, either 0 or 1 in this example
state.foo = 'bar'; // set state for every test
});
describe('math', () => {
it('to be sane', async (state, test) => {
state.parallel; // Very first test will always be ran by the 0's thread
state.foo; // this will be 'bar'
expect(2 + 2).toBe(4);
});
});
// Reporter subscribes to TestRunner events and displays information in terminal
const reporter = new Reporter(runner);
// Run all tests.
runner.run();