仅在travis上出现此错误，在我的本地计算机上可以正常工作。将Karma与Webpack和gulp一起用于角度测试用例。
Module not found: Error: Cannot resolve 'file' or 'directory' ../HTTPmocks/userService.mock.js in /home/travis/build/node-app/client-test-dest/factories
@ ./client-test-dest/factories/UserFactory.spec.js 3:23-66
已经尝试使用“路径”作为path.join和path.resolve。但是webpack在本地失败并出现错误，
WARNING in ./client-test-dest/factories/UserFactory.spec.js
Critical dependencies:
9:9-84 the request of a dependency is an expression
10:9-89 the request of a dependency is an expression
@ ./client-test-dest/factories/UserFactory.spec.js 9:9-84 10:9-89
WARNING in ./client-test-dest/factories ^\.\/.*$
Module not found: Error: a dependency to an entry point is not allowed
@ ./client-test-dest/factories ^\.\/.*$
节点：4.4.7