wip select tests

Author: jelbourn

src/lib/select/select.spec.ts

@@ -1630,20 +1630,22 @@ fdescribe('MdSelect', () => {
             `Expected trigger label to align along x-axis, accounting for the padding in rtl.`);
       }));
 
-      fit('should not adjust if all options are within a group, except the selected one',
-        fakeAsync(() => {
+      it('should not adjust if all options are within a group, except the selected one',
+        async(() => {
           groupFixture.componentInstance.control.setValue('mime-11');
           groupFixture.detectChanges();
 
           trigger.click();
           groupFixture.detectChanges();
 
-          const selected = document.querySelector('.cdk-overlay-pane md-option.mat-selected')!;
-          const selectedOptionLeft = selected.getBoundingClientRect().left;
-          const triggerLeft = trigger.getBoundingClientRect().left;
+          fixture.whenStable().then(() => {
+            const selected = document.querySelector('.cdk-overlay-pane md-option.mat-selected')!;
+            const selectedOptionLeft = selected.getBoundingClientRect().left;
+            const triggerLeft = trigger.getBoundingClientRect().left;
 
-          // 16px is the default option padding
-          expect(Math.floor(selectedOptionLeft)).toEqual(Math.floor(triggerLeft - 16));
+            // 16px is the default option padding
+            expect(Math.floor(selectedOptionLeft)).toEqual(Math.floor(triggerLeft - 16));
+          });
         }));
 
       it('should align the first option to the trigger, if nothing is selected', fakeAsync(() => {

src/lib/select/select.ts

@@ -48,6 +48,7 @@ import {
   ViewportRuler
 } from '@angular/cdk/overlay';
 import {merge} from 'rxjs/observable/merge';
+import {first} from 'rxjs/operator/first';
 import {Observable} from 'rxjs/Observable';
 import {Subscription} from 'rxjs/Subscription';
 import {fadeInContent, transformPanel, transformPlaceholder} from './select-animations';
@@ -648,8 +649,10 @@ export class MdSelect extends _MdSelectMixinBase implements AfterContentInit, On
    * Callback that is invoked when the overlay panel has been attached.
    */
   _onAttached(): void {
-    this._calculateOverlayOffsetX();
-    this._setScrollTop();
+    first.call(this.overlayDir.positionChange).subscribe(() => {
+      this._calculateOverlayOffsetX();
+      this._setScrollTop();
+    });
   }
 
   /** Whether the select has a value. */