addressed comments

Author: mmalerba

src/demo-app/sidenav/sidenav-demo.html

@@ -55,7 +55,7 @@ <h2>Dynamic Alignment Sidenav</h2>
   <md-sidenav #dynamicAlignSidenav2 mode="side" [align]="invert ? 'start' : 'end'">End</md-sidenav>
 
   <div class="demo-sidenav-content">
-    <button (click)="dynamicAlignSidenav1.toggle(); dynamicAlignSidenav2.toggle()">
+    <button (click)="toggleDynamicAlignSidenavs()">
       Toggle sidenavs
     </button>
     <button (click)="invert = !invert">Change sides</button>

src/demo-app/sidenav/sidenav-demo.ts

@@ -1,4 +1,5 @@
-import {Component, ViewEncapsulation} from '@angular/core';
+import {Component, ViewEncapsulation, ViewChild} from '@angular/core';
+import {MdSidenav} from '@angular/material';
 
 
 @Component({
@@ -9,5 +10,13 @@ import {Component, ViewEncapsulation} from '@angular/core';
   encapsulation: ViewEncapsulation.None,
 })
 export class SidenavDemo {
+  @ViewChild('dynamicAlignSidenav1') sidenav1 : MdSidenav;
+  @ViewChild('dynamicAlignSidenav2') sidenav2 : MdSidenav;
+
   invert = false;
+
+  toggleDynamicAlignSidenavs() {
+    this.sidenav1.toggle();
+    this.sidenav2.toggle();
+  }
 }

src/lib/sidenav/sidenav.spec.ts

@@ -5,6 +5,7 @@ import {MdSidenav, MdSidenavModule, MdSidenavToggleResult} from './sidenav';
 import {A11yModule} from '../core/a11y/index';
 import {PlatformModule} from '../core/platform/index';
 import {ESCAPE} from '../core/keyboard/keycodes';
+import {MdDuplicatedSidenavError} from '../../../dist/@angular/material/sidenav/sidenav';
 
 
 function endSidenavTransition(fixture: ComponentFixture<any>) {
@@ -380,7 +381,7 @@ describe('MdSidenav', () => {
       const testComponent: SidenavDynamicAlign = fixture.debugElement.componentInstance;
       testComponent.sidenav1Align = 'end';
 
-      expect(() => fixture.detectChanges()).toThrow();
+      expect(() => fixture.detectChanges()).toThrow(new MdDuplicatedSidenavError('end'));
     });
 
     it('should not throw when sidenavs swap sides', () => {