fix(tests): Directionality imports update in slider and stepper tests

Author: rkaraivanov

projects/igniteui-angular/slider/src/slider/slider.component.spec.ts

@@ -3,7 +3,7 @@ import { ComponentFixture, fakeAsync, TestBed, tick, waitForAsync } from '@angul
 import { FormsModule, ReactiveFormsModule, UntypedFormControl } from '@angular/forms';
 import { By, HammerModule } from '@angular/platform-browser';
 import { NoopAnimationsModule } from '@angular/platform-browser/animations';
-import { DIR_DOCUMENT, IgxDirectionality } from 'igniteui-angular/core';
+import { ɵDIR_DOCUMENT, ɵIgxDirectionality } from 'igniteui-angular/core';
 import { UIInteractions, wait } from '../../../test-utils/ui-interactions.spec';
 import { IgxSliderType, IgxThumbFromTemplateDirective, IgxThumbToTemplateDirective, IRangeSliderValue, TickLabelsOrientation, TicksOrientation } from './slider.common';
 import { IgxSliderComponent } from './slider.component';
@@ -51,7 +51,7 @@ describe('IgxSlider', () => {
                 SliderWithValueAdjustmentComponent
             ],
             providers: [
-                { provide: DIR_DOCUMENT, useFactory: () => fakeDoc }
+                { provide: ɵDIR_DOCUMENT, useFactory: () => fakeDoc }
             ]
         }).compileComponents();
     }));
@@ -2076,7 +2076,7 @@ export class SliderRtlComponent {
 
     public type: IgxSliderType = IgxSliderType.RANGE;
 
-    constructor(public dir: IgxDirectionality) { }
+    constructor(public dir: ɵIgxDirectionality) { }
 }
 
 @Component({

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

@@ -6,7 +6,7 @@ import { NoopAnimationsModule } from '@angular/platform-browser/animations';
 import { take } from 'rxjs/operators';
 import { IgxIconComponent } from 'igniteui-angular/icon';
 import { IgxInputDirective, IgxInputGroupComponent } from '../../../input-group/src/public_api';
-import { Direction } from 'igniteui-angular/core';
+import { ɵDirection } from 'igniteui-angular/core';
 import { UIInteractions } from '../../../test-utils/ui-interactions.spec';
 import { IgxStepComponent } from './step/step.component';
 import {
@@ -996,7 +996,7 @@ describe('Stepper service unit tests', () => {
         };
 
         mockDir = {
-            value: (): Direction => 'rtl',
+            value: (): ɵDirection => 'rtl',
             document: () => mockDocument,
             rtl: () => true
         };