How to test NGRS in Angular applications

If you need to avoid mocking of NGRS in your modules, you need to use .keep.

beforeEach(() =>
   MockBuilder(TargetComponent, TargetModule)
     .keep(NgxsModule.forRoot().ngModule) // keeps all NgxsModule.forRoot
     // add it only if your module imports NgxsModule.forFeature
     .keep(NgxsModule.forFeature().ngModule) // keeps all NgxsModule.forFeature
 );

if your module imports NgxsModule.forFeature only, you need to add NgxsModule.forRoot() manually:

beforeEach(() =>
   MockBuilder(TargetComponent, TargetModule)
     .keep(NgxsModule.forRoot()) // provides required services
     .keep(NgxsModule.forFeature().ngModule) // keeps all NgxsModule.forFeature
 );