forked from jestjs/jest
/
coverage_worker.test.js
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/
coverage_worker.test.js
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/**
* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
'use strict';
jest.mock('fs').mock('../generateEmptyCoverage');
const globalConfig = {collectCoverage: true};
const config = {};
const workerOptions = {config, globalConfig, path: 'banana.js'};
let fs;
let generateEmptyCoverage;
let worker;
beforeEach(() => {
jest.resetModules();
fs = require('fs');
generateEmptyCoverage = require('../generateEmptyCoverage').default;
worker = require('../coverage_worker').worker;
});
test('resolves to the result of generateEmptyCoverage upon success', async () => {
expect.assertions(2);
const validJS = 'function(){}';
fs.readFileSync.mockImplementation(() => validJS);
generateEmptyCoverage.mockImplementation(() => 42);
const result = await worker(workerOptions);
expect(generateEmptyCoverage).toBeCalledWith(
validJS,
'banana.js',
globalConfig,
config,
undefined,
undefined,
);
expect(result).toEqual(42);
});
test('throws errors on invalid JavaScript', async () => {
expect.assertions(1);
generateEmptyCoverage.mockImplementation(() => {
throw new Error('SyntaxError');
});
// We intentionally expect the worker to fail!
try {
await worker(workerOptions);
} catch (error) {
expect(error).toBeInstanceOf(Error);
}
});