No provider for MatSnackBar error when trying to run "ng test"

Question

So I'm trying to run "ng test" on my Angular 4 Angular CLI. I'm having many problems such as the UI not loading any helpful message if a test fails, but fortunately the console works. Anyways, this error is occuring saying I did not give MatSnackBar a provider in the spec, but when I do, I get a different error.

Chrome 66.0.3359 (Linux 0.0.0) BranchNameCellComponent should create FAILED     Error: No provider for MatSnackBar! 

Error when I include MatSnackBar as an import

Chrome 66.0.3359 (Linux 0.0.0) BranchNameCellComponent should create FAILED     Failed: Unexpected value 'MatSnackBar' imported by the module 'DynamicTestModule'. Please add a @NgModule annotation. 

In my component code, I'm importing MatSnackBar and calling it in the constructor. It works fine.

import { MatSnackBar } from '@angular/material'; .... constructor(private httpClient: HttpClient, private fb: FormBuilder, public snackBar: MatSnackBar) { } 

But in the spec, I try this to no avail.

import { MatSnackBar } from '@angular/material'; .... describe('BranchNameCellComponent', () => {   let component: BranchNameCellComponent;   let fixture: ComponentFixture<BranchNameCellComponent>;    beforeEach(async(() => {     TestBed.configureTestingModule({       declarations: [ BranchNameCellComponent ],       imports: [ HttpClientTestingModule, ReactiveFormsModule, MatSnackBar ],       schemas: [ NO_ERRORS_SCHEMA ]     })     .compileComponents();   }));    it('should create', () => {     fixture = TestBed.createComponent(BranchNameCellComponent);     component = fixture.componentInstance;     expect(component).toBeTruthy();   }); }); 

After importing the module like Diego suggested, I now get a timeout error on that same test

08 06 2018 16:14:52.839:WARN [Chrome 66.0.3359 (Linux 0.0.0)]: Disconnected (1 times), because no message in 10000 ms. Chrome 66.0.3359 (Linux 0.0.0) ERROR Chrome 66.0.3359 (Linux 0.0.0) ERROR   Disconnected, because no message in 10000 ms. Chrome 66.0.3359 (Linux 0.0.0): Executed 16 of 56 DISCONNECTED (11.204 secs / 1.241 secs) Chrome 66.0.3359 (Linux 0.0.0) ERROR Chrome 66.0.3359 (Linux 0.0.0): Executed 16 of 56 DISCONNECTED (11.204 secs / 1.241 secs) 

Answer 1

You should import the module instead of the component.

import { MatSnackBar, MatSnackBarModule } from '@angular/material'; .... describe('BranchNameCellComponent', () => {   let component: BranchNameCellComponent;   let fixture: ComponentFixture<BranchNameCellComponent>;        beforeEach(async(() => {     TestBed.configureTestingModule({       declarations: [ BranchNameCellComponent ],       imports: [ HttpClientTestingModule, ReactiveFormsModule, MatSnackBarModule ],       schemas: [ NO_ERRORS_SCHEMA ]     }).compileComponents();   }));        it('should create', () => {     fixture = TestBed.createComponent(BranchNameCellComponent);     component = fixture.componentInstance;     expect(component).toBeTruthy();   }); }); 

For the issue related to the timeout, try adding this to your karma config file:

captureTimeout: 210000, browserDisconnectTolerance: 3,  browserDisconnectTimeout : 210000, browserNoActivityTimeout : 210000, 

Answer 2

This has happened to me recently and I decided like this::

Include file aap.module.ts

import { MatSnackBarModule } from '@angular/material/snack-bar'; ... ... imports: [     ...     MatSnackBarModule   ] ... 

On file component or service:

import { MatSnackBar } from '@angular/material/snack-bar'; ... ... constructor(private snackBar: MatSnackBar) { } ...