webpack: Failed to compile with two warinings and one error

hi eddyerburgh. @eddyerburgh
I have pull code and intergrate to my project . After
```
npm install
npm run test
```
There are two warnings and one error . and

> webpack: Failed to compile.

log as follow:

> WARNING in ./node_modules/_vue-server-renderer@2.5.16@vue-server-renderer/build.js
> 8330:15-8333:9 Critical dependency: the request of a dependency is an expression
> @ ./node_modules/_vue-server-renderer@2.5.16@vue-server-renderer/build.js
> @ ./node_modules/_vue-server-renderer@2.5.16@vue-server-renderer/index.js
> @ ./node_modules/@vue/test-utils/dist/vue-test-utils.js
> @ ./test/Counter.spec.js
>
> WARNING in ./node_modules/_vue-server-renderer@2.5.16@vue-server-renderer/build.js
> 8335:15-28 Critical dependency: the request of a dependency is an expression
> @ ./node_modules/_vue-server-renderer@2.5.16@vue-server-renderer/build.js
> @ ./node_modules/_vue-server-renderer@2.5.16@vue-server-renderer/index.js
> @ ./node_modules/@vue/test-utils/dist/vue-test-utils.js
> @ ./test/Counter.spec.js
>
> ERROR in ./node_modules/_vue-server-renderer@2.5.16@vue-server-renderer/build.js
> Module not found: Error: Can't resolve 'module' in 'E:\vue\vue-test-utils-karma-example\node_modules\_vue-server-renderer@2.5.16@vue-server-renderer'
> @ ./node_modules/_vue-server-renderer@2.5.16@vue-server-renderer/build.js 8276:19-36
> @ ./node_modules/_vue-server-renderer@2.5.16@vue-server-renderer/index.js
> @ ./node_modules/@vue/test-utils/dist/vue-test-utils.js
> @ ./test/Counter.spec.js

Although webpack failed to compile, Karma still work.

> 22 03 2018 19:48:16.897:INFO [karma]: Front-end scripts not present. Compiling...
> 22 03 2018 19:48:20.331:INFO [karma]: Karma v2.0.0 server started at http://0.0.0.0:9876/
> 22 03 2018 19:48:20.332:INFO [launcher]: Launching browser Chrome with unlimited concurrency
> 22 03 2018 19:48:20.344:INFO [launcher]: Starting browser Chrome
> 22 03 2018 19:48:23.181:INFO [Chrome 64.0.3282 (Windows 7.0.0)]: Connected on socket YtU4azNnotfeG8rTAAAA with id 90404201
>
> Counter.vue
> √ increments count when button is clicked
>
> Chrome 64.0.3282 (Windows 7.0.0): Executed 1 of 1 SUCCESS (0.109 secs / 0.018 secs)
> TOTAL: 1 SUCCESS
>
>
> Coverage summary
> Statements : 100% ( 2/2 )
> Branches : 100% ( 0/0 )
> Functions : 100% ( 0/0 )
> Lines : 100% ( 2/2 )

so why webpack fail to compile and how to solve it? Thanks!