test(material/snack-bar): clean up unnecessary imports in tests

Removes imports from tests that aren't necessary anymore, because we're using standalone.

Author: crisbeto

src/material/snack-bar/snack-bar.spec.ts

@@ -16,7 +16,6 @@ import {
   MAT_SNACK_BAR_DATA,
   MatSnackBar,
   MatSnackBarConfig,
-  MatSnackBarModule,
   MatSnackBarRef,
   SimpleSnackBar,
 } from './index';
@@ -39,12 +38,6 @@ describe('MatSnackBar', () => {
 
   beforeEach(fakeAsync(() => {
     TestBed.configureTestingModule({
-      imports: [
-        MatSnackBarModule,
-        ComponentWithChildViewContainer,
-        BurritosNotification,
-        DirectiveWithViewContainer,
-      ],
       providers: [{provide: MATERIAL_ANIMATIONS, useValue: {animationsDisabled: true}}],
     });
 
@@ -671,10 +664,6 @@ describe('MatSnackBar with parent MatSnackBar', () => {
   let fixture: ComponentFixture<ComponentThatProvidesMatSnackBar>;
 
   beforeEach(fakeAsync(() => {
-    TestBed.configureTestingModule({
-      imports: [MatSnackBarModule, ComponentThatProvidesMatSnackBar, DirectiveWithViewContainer],
-    });
-
     parentSnackBar = TestBed.inject(MatSnackBar);
     overlayContainerElement = TestBed.inject(OverlayContainer).getContainerElement();
     fixture = TestBed.createComponent(ComponentThatProvidesMatSnackBar);
@@ -741,10 +730,6 @@ describe('MatSnackBar Positioning', () => {
   let simpleActionLabel = 'pickup';
 
   beforeEach(fakeAsync(() => {
-    TestBed.configureTestingModule({
-      imports: [MatSnackBarModule, ComponentWithChildViewContainer, DirectiveWithViewContainer],
-    });
-
     snackBar = TestBed.inject(MatSnackBar);
     overlayContainerEl = TestBed.inject(OverlayContainer).getContainerElement();
     viewContainerFixture = TestBed.createComponent(ComponentWithChildViewContainer);

src/material/snack-bar/snack-bar.zone.spec.ts

@@ -9,7 +9,6 @@ import {
   inject,
 } from '@angular/core';
 import {ComponentFixture, TestBed, fakeAsync, flush, tick} from '@angular/core/testing';
-import {MatSnackBarModule} from './snack-bar-module';
 import {MatSnackBar} from './snack-bar';
 import {MatSnackBarConfig} from './snack-bar-config';
 import {MATERIAL_ANIMATIONS} from '../core';
@@ -20,7 +19,6 @@ describe('MatSnackBar Zone.js integration', () => {
 
   beforeEach(fakeAsync(() => {
     TestBed.configureTestingModule({
-      imports: [MatSnackBarModule, ComponentWithChildViewContainer, DirectiveWithViewContainer],
       providers: [
         provideZoneChangeDetection(),
         {provide: MATERIAL_ANIMATIONS, useValue: {animationsDisabled: true}},