emotionalplant * Hi, ng test is giving me errors:

"ERROR: ''mat-toolbar' is not a known element:

\1. If 'mat-toolbar' is an Angular component, then verify that it is part of this module."

but, ng serve build without errors (and everything works just fine). I have a nested module so I'm wondering if I need to import dependencies on app.module ontop of the child module? Or do they need to be exported by the child module? (I tried adding to app.module with no results)