Provide Unit test guidance

[jsgoupil]

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I'm submitting a ...

• [ ] bug report

• [X] feature request

• [ ] question about the decisions made in the repository

• What is the expected behavior? There is no documentation or code to help out mock the Analytics. If there are, please put them in your README or wiki.

• What is the motivation / use case for changing the behavior? I have written a mock for the following, but maybe it would need more.

@Injectable()
export class Angulartics2Mock {
    settings = {};
    setUsername = new ReplaySubject<string | {
        userId: string | number;
    }>();
    setUserProperties = new ReplaySubject<any>();
}

@Injectable()
export class Angulartics2GoogleAnalyticsMock extends Angulartics2GoogleAnalytics {
    constructor(
        angulartics2: Angulartics2
    ) {
        super(angulartics2);
    }

    startTracking(): void { }
    pageTrack(path: string): void { }
    eventTrack(action: string, properties: any): void { }
    exceptionTrack(properties: any): void { }
    userTimings(properties: UserTimings): void { }
    setUsername(userId: string): void { }
    setUserProperties(properties: any): void { }
}

• Environment:

Angular CLI: 9.1.0
Node: 12.3.1
OS: win32 x64

Angular: 9.1.0
... animations, cli, common, compiler, compiler-cli, core, forms
... language-service, localize, platform-browser
... platform-browser-dynamic, router
Ivy Workspace: Yes

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.901.0
@angular-devkit/build-angular     0.901.0
@angular-devkit/build-optimizer   0.901.0
@angular-devkit/build-webpack     0.901.0
@angular-devkit/core              9.1.0
@angular-devkit/schematics        9.1.0
@angular/cdk                      9.2.0
@angular/material                 9.2.0
@ngtools/webpack                  9.1.0
@schematics/angular               9.1.0
@schematics/update                0.901.0
rxjs                              6.5.4
typescript                        3.8.3
webpack                           4.42.0