feat(modal-backdrop): added tests to modal-backdrop component

src/spec/modal-backdrop.component.spec.ts

@@ -1,6 +1,9 @@
-import { ModalBackdropComponent } from '../modal';
+import { DebugElement } from '@angular/core';
 import { ComponentFixture, TestBed } from '@angular/core/testing';
 
+import { ModalBackdropComponent } from '../modal';
+import { window } from '../utils/facade/browser';
+
 describe('ModalBackdropComponent tests', () => {
   let fixture: ComponentFixture<ModalBackdropComponent>;
   let component: ModalBackdropComponent;
@@ -11,15 +14,41 @@ describe('ModalBackdropComponent tests', () => {
     });
     fixture = TestBed.createComponent(ModalBackdropComponent);
     component = fixture.componentInstance;
+    component.isAnimated = true;
     fixture.detectChanges();
   });
 
   it('should get and set isAnimated correctly', () => {
+    component.isAnimated = false;
+    expect(component.isAnimated).toBeFalsy();
     component.isAnimated = true;
     expect(component.isAnimated).toBeTruthy();
   });
 
-  it('isShown() tests', () => {
+  it('should get and set isShown correctly', () => {
+    component.isShown = false;
+    expect(component.isShown).toBeFalsy();
+    component.isShown = true;
+    expect(component.isShown).toBeTruthy();
+  });
+
+  it('isShown() tests, when bs4', () => {
+    const tempVal = window.__theme;
+    window.__theme = 'bs4';
+    component.isShown = true;
+    fixture.detectChanges();
+    let modalClass = component.element.nativeElement.classList.contains('show');
+    expect(modalClass).toBeTruthy();
+    component.isShown = false;
+    fixture.detectChanges();
+    modalClass = component.element.nativeElement.classList.contains('show');
+    expect(modalClass).toBeFalsy();
+    window.__theme = tempVal;
+  });
+
+  it('isShown() tests, when bs3', () => {
+    const tempVal = window.__theme;
+    window.__theme = 'bs3';
     component.isShown = true;
     fixture.detectChanges();
     let modalClass = component.element.nativeElement.classList.contains('in');
@@ -28,5 +57,6 @@ describe('ModalBackdropComponent tests', () => {
     fixture.detectChanges();
     modalClass = component.element.nativeElement.classList.contains('in');
     expect(modalClass).toBeFalsy();
+    window.__theme = tempVal;
   });
 });