Angular NullInjectorError No provider for Router!

If you are getting the following error while running ng test:

NullInjectorError: R3InjectorError(DynamicTestModule)[Router -> Router]: 
  NullInjectorError: No provider for Router!	NullInjectorError: R3InjectorError(DynamicTestModule)[Router -> Router]: 
	  NullInjectorError: No provider for Router!
	error properties: Object({ ngTempTokenPath: null, ngTokenPath: [ 'Router', 'Router' ] })
	NullInjectorError: R3InjectorError(DynamicTestModule)[Router -> Router]: 
	  NullInjectorError: No provider for Router!
	    at NullInjector.get (node_modules/@angular/core/fesm2020/core.mjs:9091:27)
	    at R3Injector.get (node_modules/@angular/core/fesm2020/core.mjs:9258:33)
	    at R3Injector.get (node_modules/@angular/core/fesm2020/core.mjs:9258:33)
	    at NgModuleRef.get (node_modules/@angular/core/fesm2020/core.mjs:22413:33)
	    at ChainedInjector.get (node_modules/@angular/core/fesm2020/core.mjs:22217:36)
	    at lookupTokenUsingModuleInjector (node_modules/@angular/core/fesm2020/core.mjs:3379:39)
	    at getOrCreateInjectable (node_modules/@angular/core/fesm2020/core.mjs:3424:12)
	    at ɵɵdirectiveInject (node_modules/@angular/core/fesm2020/core.mjs:10407:12)
	    at NodeInjectorFactory.factory (ng:///HeaderNavigationComponent/ɵfac.js:6:7)
	    at getNodeInjectable (node_modules/@angular/core/fesm2020/core.mjs:3609:44)

The solution is to import RouterTestingModule in your spec file of your component

  beforeEach(async () => {
    await TestBed.configureTestingModule({
      imports:[RouterTestingModule]
    }).compileComponents();

The complete file will look like this:

import { ComponentFixture, TestBed } from '@angular/core/testing';
import { RouterTestingModule } from '@angular/router/testing';

import { YourComponent } from './YourComponent.component';

describe('YourComponent', () => {
  let component: YourComponent;
  let fixture: ComponentFixture<YourComponent>;

  beforeEach(async () => {
    await TestBed.configureTestingModule({
      imports:[RouterTestingModule],
      declarations:[....YourDeclarationsIfNeeded]
    }).compileComponents();

    fixture = TestBed.createComponent(YourComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
  });

  it('should create', () => {
    expect(component).toBeTruthy();
  });
});