forked from jestjs/jest
/
generateEmptyCoverage.test.js
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/
generateEmptyCoverage.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.
*/
import os from 'os';
import path from 'path';
import istanbulCoverage from 'istanbul-lib-coverage';
import libSourceMaps from 'istanbul-lib-source-maps';
import {makeGlobalConfig, makeProjectConfig} from '@jest/test-utils';
import {shouldInstrument} from '@jest/transform';
import generateEmptyCoverage from '../generateEmptyCoverage';
jest.mock('@jest/transform', () => ({
...jest.requireActual('@jest/transform'),
shouldInstrument: jest.fn(),
}));
describe('generateEmptyCoverage', () => {
const coverageMap = istanbulCoverage.createCoverageMap({});
const sourceMapStore = libSourceMaps.createSourceMapStore();
const rootDir = __dirname;
const filepath = path.join(rootDir, './sum.js');
it('generates an empty coverage object for a file without running it', async () => {
const src = `
throw new Error('this should not be thrown');
const a = (b, c) => {
if (b) {
return c;
} else {
return b;
}
};
module.exports = {
a,
};`;
shouldInstrument.mockReturnValueOnce(true);
const emptyCoverage = await generateEmptyCoverage(
src,
filepath,
makeGlobalConfig(),
makeProjectConfig({
cacheDirectory: os.tmpdir(),
cwd: rootDir,
rootDir,
transform: [['\\.js$', require.resolve('babel-jest')]],
}),
);
expect(emptyCoverage).not.toBeNull();
expect(typeof emptyCoverage).toBe('object');
let coverage = emptyCoverage.coverage;
if (emptyCoverage.sourceMapPath) {
coverageMap.addFileCoverage(emptyCoverage.coverage);
sourceMapStore.registerURL(filepath, emptyCoverage.sourceMapPath);
coverage = sourceMapStore.transformCoverage(coverageMap).map;
}
expect(coverage.data).toMatchSnapshot({
path: expect.any(String),
});
});
it('generates a null coverage result when using /* istanbul ignore file */', async () => {
const src = `
/* istanbul ignore file */
const a = (b, c) => {
if (b) {
return c;
} else {
return b;
}
};
module.exports = { a };
`;
shouldInstrument.mockReturnValueOnce(true);
const nullCoverage = await generateEmptyCoverage(
src,
filepath,
makeGlobalConfig(),
makeProjectConfig({
cacheDirectory: os.tmpdir(),
cwd: rootDir,
rootDir,
transform: [['\\.js$', require.resolve('babel-jest')]],
}),
);
expect(nullCoverage).toBeNull();
});
it('generates a null coverage result when collectCoverage global config is false', async () => {
const src = `
const a = (b, c) => {
if (b) {
return c;
} else {
return b;
}
};
module.exports = { a };
`;
shouldInstrument.mockReturnValueOnce(false);
const nullCoverage = await generateEmptyCoverage(
src,
filepath,
makeGlobalConfig(),
makeProjectConfig({
cacheDirectory: os.tmpdir(),
cwd: rootDir,
rootDir,
transform: [['\\.js$', require.resolve('babel-jest')]],
}),
);
expect(nullCoverage).toBeNull();
});
});