Change 'platform.SAFARI || platform.EDGE || platform.FIREFOX' to '!platform.IS_TRIDENT'

Author: sllethe

src/lib/list/selection-list.spec.ts

@@ -1,4 +1,4 @@
-import {async, TestBed, ComponentFixture} from '@angular/core/testing';
+import {async, TestBed, ComponentFixture, inject} from '@angular/core/testing';
 import {Component, DebugElement} from '@angular/core';
 import {By} from '@angular/platform-browser';
 import {MdSelectionList, MdListOption, MdListModule} from './index';
@@ -169,6 +169,7 @@ describe('test selection list with single option', () => {
   let listOption: DebugElement;
   let listItemEl: DebugElement;
   let selectionList: DebugElement;
+  let platform: Platform;
 
   beforeEach(async(() => {
     TestBed.configureTestingModule({
@@ -192,12 +193,16 @@ describe('test selection list with single option', () => {
     fixture.detectChanges();
   }));
 
+  beforeEach(inject([Platform], (p: Platform) => {
+    platform = p;
+  }));
+
   it('should be focused when focus on nativeElements', () => {
     listOption.nativeElement.focus();
     fixture.detectChanges();
 
     expect(listItemEl.nativeElement).toBe(document.activeElement);
-    if (!fixture.componentInstance.isIE) {
+    if (!platform.IS_TRIDENT) {
       expect(listItemEl.nativeElement.className).toContain('mat-list-item-focus');
     }
 
@@ -345,12 +350,4 @@ class SelectionListWithListDisabled {
     </md-list-option>
   </mat-selection-list>`})
 class SelectionListWithOnlyOneOption {
-  isIE: boolean = true;
-  constructor(public platform: Platform) {
-    if (platform.SAFARI || platform.EDGE || platform.FIREFOX) {
-      this.isIE = false;
-    } else {
-      this.isIE = true;
-    }
-  }
 }