ERROR in 'mat-checkbox' is not a known element: 1. If 'mat-checkbox' is an Angular component, then verify that it is part of this module. code example

Example: 'mat-checkbox' is not a known element

import { MatCheckboxModule } from '@angular/material/checkbox';

TestBed.configureTestingModule({
   imports: [
        MatCheckboxModule
   ],
   declarations: [AddAlarmsFormComponent]
})