message: Add missing imports of Material modules
diff: import { TranslateModule } from '@ngx-translate/core'
  import { HttpClientTestingModule } from '@angular/common/http/testing'
  -import { MatDialogRef } from '@angular/material'
  +import { MatDialogRef, MatIconModule, MatTooltipModule } from '@angular/material'
  import { CookieModule, CookieService } from 'ngx-cookie'
  import { async, ComponentFixture, TestBed } from '@angular/core/testing'
  @@ -19,7 +19,9 @@ describe('WelcomeBannerComponent', () => {
  imports: [
  TranslateModule.forRoot(),
  CookieModule.forRoot(),
  - HttpClientTestingModule
  + HttpClientTestingModule,
  + MatIconModule,
  + MatTooltipModule
  ],
  declarations: [WelcomeBannerComponent],
  providers: [
  