`ng test` breaks when module.id is set

[filipesilva]

ng test will break on apps that have moduleId: module.id in the @Component metadata.

Error: moduleId should be a string in "AppComponent". See https://goo.gl/wIDDiL for more information.
If you're using Webpack you should inline the template and the styles, see https://goo.gl/X2J8zc.

This is due to ng test using a different setup of AoTplugin that does not strip module.id.

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