Critical dependency: the request of a dependency is an expression

[delasteve]

1. OS? Windows 7, 8 or 10. Linux (which distribution). Mac OSX (Yosemite? El Capitan?)
   macOS El Capitan

2. Versions. Please run ng --version. If there's nothing outputted, please run in a Terminal: node --version and paste the result here:

   angular-cli: 1.0.0-beta.15
   node: 6.4.0
   os: darwin x64
   

3. Repro steps. Was this an app that wasn't created using the CLI? What change did you
   do on your code? etc.
   ng new testapp
cd testapp
ng test

4. The log given by the failure. Normally this include a stack trace and some
   more information.

   WARNING in ./~/@angular/core/src/linker/system_js_ng_module_factory_loader.js
   45:15 Critical dependency: the request of a dependency is an expression
   
   WARNING in ./~/@angular/core/src/linker/system_js_ng_module_factory_loader.js
   57:15 Critical dependency: the request of a dependency is an expression
   

5. Mention any other details that might be useful.
   I believe this is the fix for it. Webpack Warning in system_js_ng_module_factory_loader.js angular#11580 (comment)
   The warning only happens while running ng test but not when doing ng build or ng serve

[TheLarkInn]

Need to add ContextReplacementPlugin in test configs. A PR would be welcomed for this.

[JohannesRudolph]

With #2362 closed, this can be closed as well, right?

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