react-native/local-cli/core/__tests__/findPlugins.spec.js

/**
 * Copyright (c) 2013-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @format
 * @emails oncall+javascript_foundation
 */

'use strict';

const findPlugins = require('../findPlugins');
const path = require('path');

const ROOT = path.join(__dirname, '..', '..', '..');
const pjsonPath = path.join(ROOT, 'package.json');

describe('findPlugins', () => {
  beforeEach(() => {
    jest.resetModules();
  });

  it('returns an array of dependencies', () => {
    jest.mock(pjsonPath, () => ({
      dependencies: {'rnpm-plugin-test': '*'},
    }));

    expect(findPlugins([ROOT])).toHaveProperty('commands');
    expect(findPlugins([ROOT])).toHaveProperty('platforms');
    expect(findPlugins([ROOT]).commands).toHaveLength(1);
    expect(findPlugins([ROOT]).commands[0]).toBe('rnpm-plugin-test');
    expect(findPlugins([ROOT]).platforms).toHaveLength(0);
  });

  it('returns an empty array if there are no plugins in this folder', () => {
    jest.mock(pjsonPath, () => ({}));
    expect(findPlugins([ROOT])).toHaveProperty('commands');
    expect(findPlugins([ROOT])).toHaveProperty('platforms');
    expect(findPlugins([ROOT]).commands).toHaveLength(0);
    expect(findPlugins([ROOT]).platforms).toHaveLength(0);
  });

  it('returns an object with empty arrays if there is no package.json in the supplied folder', () => {
    expect(findPlugins(['fake-path'])).toHaveProperty('commands');
    expect(findPlugins(['fake-path'])).toHaveProperty('platforms');
    expect(findPlugins(['fake-path']).commands).toHaveLength(0);
    expect(findPlugins(['fake-path']).platforms).toHaveLength(0);
  });

  it('returns plugins from both dependencies and dev dependencies', () => {
    jest.mock(pjsonPath, () => ({
      dependencies: {'rnpm-plugin-test': '*'},
      devDependencies: {'rnpm-plugin-test-2': '*'},
    }));
    expect(findPlugins([ROOT])).toHaveProperty('commands');
    expect(findPlugins([ROOT])).toHaveProperty('platforms');
    expect(findPlugins([ROOT]).commands).toHaveLength(2);
    expect(findPlugins([ROOT]).platforms).toHaveLength(0);
  });

  it('returns unique list of plugins', () => {
    jest.mock(pjsonPath, () => ({
      dependencies: {'rnpm-plugin-test': '*'},
      devDependencies: {'rnpm-plugin-test': '*'},
    }));
    expect(findPlugins([ROOT]).commands).toHaveLength(1);
  });
});