jest.dontMock('../src/utils/VirtualBoxUtil'); var virtualBox = require('../src/utils/VirtualBoxUtil'); var util = require('../src/utils/Util'); describe('VirtualBox', function () { describe('version 4.3.20r96996', function () { pit('correctly parses virtualbox version', function () { util.exec.mockImplementation(function () { return Promise.resolve('4.3.20r96996'); }); return virtualBox.version().then(function (version) { expect(version).toBe('4.3.20'); }); }); }); });