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https://github.com/puppeteer/puppeteer
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a5db6d412c
This patch migrates tests so that they can be run concurrently. - By default, tests still run in one thread. - To run tests in 4 parallel threads, run node test/test.js -j 4 or npm run unit -- -j 4 - Environment variable PPTR_PARALLEL_TESTS could be set to override default parallelization Every test gets passed in a state. State is set up in the beforeAll and beforeEach callbacks, and should be teared down in the afterAll and afterEach callbacks. By default, state has a parallelIndex variable initialized that defines the thread index that runs the execution.
46 lines
1.2 KiB
Markdown
46 lines
1.2 KiB
Markdown
# TestRunner
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- testrunner is a library: no additional binary required; tests are `node.js` scripts
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- parallel wrt IO operations
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- supports async/await
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- modular
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- well-isolated state per execution thread
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Example
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```js
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const {TestRunner, Reporter, Matchers} = require('../utils/testrunner');
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// Runner holds and runs all the tests
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const runner = new TestRunner({
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parallel: 2, // run 2 parallel threads
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timeout: 1000, // setup timeout of 1 second per test
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});
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// Simple expect-like matchers
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const {expect} = new Matchers();
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// Extract jasmine-like DSL into the global namespace
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const {describe, xdescribe, fdescribe} = runner;
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const {it, fit, xit} = runner;
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const {beforeAll, beforeEach, afterAll, afterEach} = runner;
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beforeAll(state => {
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state.parallelIndex; // either 0 or 1 in this example, depending on the executing thread
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state.foo = 'bar'; // set state for every test
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});
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describe('math', () => {
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it('to be sane', async (state, test) => {
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state.parallel; // Very first test will always be ran by the 0's thread
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state.foo; // this will be 'bar'
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expect(2 + 2).toBe(4);
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});
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});
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// Reporter subscribes to TestRunner events and displays information in terminal
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const reporter = new Reporter(runner);
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// Run all tests.
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runner.run();
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```
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