10 specs, 10 failures - Can't bind to 'routerLink' since it isn't a known property of 'button'

I decided to experiment the testing features of Angular. I have an app already so I just ran ng test and instantly it has errors that I don't understand. This is my first time running angular testing.

Here is the output:

AppComponent should create the app
Failed: Template parse errors:
Can't bind to 'routerLink' since it isn't a known property of 'button'. ("<mat-toolbar color="primary">
    <mat-toolbar-row>
        <button mat-button [ERROR ->][routerLink]="'/'"></button>
        <button mat-button (click)="login()" *ngIf="!user">Logi"): ng:///DynamicTestModule/AppComponent.html@2:27
'mat-toolbar-row' is not a known element:
1. If 'mat-toolbar-row' is an Angular component, then verify that it is part of this module.
2. If 'mat-toolbar-row' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. ("<mat-toolbar color="primary">

Here is the HTML snippet in app.component.html:

<button mat-button [routerLink]="[ ... ]"></button>

And I definitely imported RouterModule into app.module.ts:

@NgModule({
    declarations: [
        ...
    ],
    imports: [
        RouterModule.forRoot(routes),
        ...
    ],
    ...
})
export class AppModule {}