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rOACCT/node_modules/webpack-cli/lib/utils/__tests__/get-package-manager.test.js
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get-package-manager.test.js
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const fs = require('fs');
const path = require('path');
const syncMock = jest.fn(() => {
return {
stdout: '1.0.0',
};
});
jest.setMock('execa', {
sync: syncMock,
});
const getPackageManager = require('../get-package-manager');
jest.mock('cross-spawn');
const globalModulesNpmValue = 'test-npm';
jest.setMock('global-modules', globalModulesNpmValue);
jest.setMock('enquirer', {
prompt: jest.fn(),
});
describe('packageUtils', () => {
describe('getPackageManager', () => {
const testYarnLockPath = path.resolve(__dirname, 'test-yarn-lock');
const testNpmLockPath = path.resolve(__dirname, 'test-npm-lock');
const testBothPath = path.resolve(__dirname, 'test-both');
const cwdSpy = jest.spyOn(process, 'cwd');
beforeAll(() => {
// package-lock.json is ignored by .gitignore, so we simply
// write a lockfile here for testing
if (!fs.existsSync(testNpmLockPath)) {
fs.mkdirSync(testNpmLockPath);
}
fs.writeFileSync(path.resolve(testNpmLockPath, 'package-lock.json'), '');
fs.writeFileSync(path.resolve(testBothPath, 'package-lock.json'), '');
});
beforeEach(() => {
syncMock.mockClear();
});
it('should find yarn.lock', () => {
cwdSpy.mockReturnValue(testYarnLockPath);
expect(getPackageManager()).toEqual('yarn');
expect(syncMock.mock.calls.length).toEqual(0);
});
it('should find package-lock.json', () => {
cwdSpy.mockReturnValue(testNpmLockPath);
expect(getPackageManager()).toEqual('npm');
expect(syncMock.mock.calls.length).toEqual(0);
});
it('should prioritize yarn with many lock files', () => {
cwdSpy.mockReturnValue(testBothPath);
expect(getPackageManager()).toEqual('yarn');
expect(syncMock.mock.calls.length).toEqual(0);
});
it('should use yarn if yarn command works', () => {
// yarn should output a version number to stdout if
// it is installed
cwdSpy.mockReturnValue(path.resolve(__dirname));
expect(getPackageManager()).toEqual('yarn');
expect(syncMock.mock.calls.length).toEqual(1);
});
it('should use npm if yarn command fails', () => {
syncMock.mockImplementation(() => {
throw new Error();
});
cwdSpy.mockReturnValue(path.resolve(__dirname));
expect(getPackageManager()).toEqual('npm');
expect(syncMock.mock.calls.length).toEqual(1);
});
});
});
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