feat(stepper): update to latest changes

Author: ddaribo

projects/igniteui-angular/src/lib/stepper/stepper.component.spec.ts

@@ -1,4 +1,4 @@
-import { Component, ViewChild } from '@angular/core';
+import { ChangeDetectorRef, Component, ViewChild } from '@angular/core';
 import { fakeAsync, ComponentFixture, TestBed, waitForAsync, tick } from '@angular/core/testing';
 import { configureTestSuite } from '../test-utils/configure-suite';
 import { IgxStepperComponent, IgxStepperModule } from './stepper.component';
@@ -9,13 +9,17 @@ import { IgxStepperOrienatation, IgxStepperTitlePosition, IgxStepType,  IStepCha
 import { Subject } from 'rxjs';
 import { takeUntil } from 'rxjs/operators';
 import { IgxIconModule } from '../icon/public_api';
+import { IgxStepperService } from './stepper.service';
+import { AnimationBuilder } from '@angular/animations';
+import { IgxDirectionality } from '../services/direction/directionality';
+import { IgxStepComponent } from './step/step.component';
 
 const STEPPER_CLASS = 'igx-stepper';
 const STEPPER_HEADER = 'igx-stepper__header';
 const STEP_TAG = 'IGX-STEP';
 const STEP_HEADER = 'igx-stepper__step-header';
 
-fdescribe('Rendering Tests', () => {
+describe('Rendering Tests', () => {
     configureTestSuite();
     let fix: ComponentFixture<IgxStepperSampleTestComponent>;
     let stepper: IgxStepperComponent;
@@ -631,6 +635,8 @@ fdescribe('Rendering Tests', () => {
     });
 });
 
+describe('Stepper service unit tests', () => {
+});
 
 @Component({
     template: `