renovate/test/helpers/npm.spec.js

const npmHelper = require('../../lib/helpers/npm');
const defaultConfig = require('../../lib/config/defaults').getConfig();

jest.mock('fs');
jest.mock('child_process');
jest.mock('tmp');

const fs = require('fs');
const cp = require('child_process');
const tmp = require('tmp');

describe('generateLockFile(newPackageJson, npmrcContent)', () => {
  tmp.dirSync = jest.fn(() => ({ name: 'somedir' }));
  fs.writeFileSync = jest.fn();
  fs.readFileSync = jest.fn(() => 'package-lock-contents');
  cp.spawnSync = jest.fn(() => ({
    stdout: '',
    stderror: '',
  }));
  it('generates lock files', async () => {
    const packageLock = await npmHelper.generateLockFile(
      'package-json-contents',
      'npmrc-contents'
    );
    expect(tmp.dirSync.mock.calls.length).toEqual(1);
    expect(fs.writeFileSync.mock.calls.length).toEqual(2);
    expect(fs.readFileSync.mock.calls.length).toEqual(1);
    expect(packageLock).toEqual('package-lock-contents');
  });
});
describe('getLockFile(packageJson, config)', () => {
  let api;
  beforeEach(() => {
    api = {
      getFileContent: jest.fn(),
    };
  });
  it('returns null if no existing package-lock.json', async () => {
    api.getFileContent.mockReturnValueOnce(false);
    expect(await npmHelper.getLockFile('package.json', '', api)).toBe(null);
  });
  it('returns package-lock.json file', async () => {
    api.getFileContent.mockReturnValueOnce('Existing package-lock.json');
    api.getFileContent.mockReturnValueOnce(null); // npmrc
    npmHelper.generateLockFile = jest.fn();
    npmHelper.generateLockFile.mockReturnValueOnce('New package-lock.json');
    const packageLockFile = {
      name: 'package-lock.json',
      contents: 'New package-lock.json',
    };
    expect(await npmHelper.getLockFile('package.json', '', api)).toMatchObject(
      packageLockFile
    );
  });
});

describe('maintainLockFile(inputConfig)', () => {
  let config;
  beforeEach(() => {
    config = Object.assign({}, defaultConfig);
    config.packageFile = 'package.json';
    config.api = {
      getFileContent: jest.fn(),
    };
    config.api.getFileContent.mockReturnValueOnce('oldPackageContent');
    npmHelper.getLockFile = jest.fn();
  });
  it('returns null if no file to maintain', async () => {
    const packageLock = await npmHelper.maintainLockFile(config);
    expect(config.api.getFileContent.mock.calls.length).toBe(2);
    expect(packageLock).toEqual(null);
  });
  it('returns null if contents match', async () => {
    config.api.getFileContent.mockReturnValueOnce('oldPackageLockContent');
    npmHelper.getLockFile.mockReturnValueOnce({
      contents: 'oldPackageLockContent',
    });
    const packageLock = await npmHelper.maintainLockFile(config);
    expect(config.api.getFileContent.mock.calls.length).toBe(2);
    expect(packageLock).toEqual(null);
  });
  it('returns new package lock if contents differ', async () => {
    config.api.getFileContent.mockReturnValueOnce('oldPackageLockContent');
    npmHelper.getLockFile.mockReturnValueOnce({
      contents: 'newPackageLockContent',
    });
    const packageLock = await npmHelper.maintainLockFile(config);
    expect(config.api.getFileContent.mock.calls.length).toBe(2);
    expect(packageLock).toEqual({ contents: 'newPackageLockContent' });
  });
});