diff --git a/Gruntfile.js b/Gruntfile.js
index 60d02efd0d8..d913c20944b 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -180,10 +180,14 @@ grunt.initConfig({
 	},
 	qunit: {
 		files: expandFiles( "tests/unit/**/*.html" ).filter(function( file ) {
-			// disabling everything that doesn't (quite) work with PhantomJS for now
 			// TODO except for all|index|test, try to include more as we go
-			return !( /(all|index|test|dialog|tooltip)\.html$/ ).test( file );
-		})
+			return !( /(all|index|test)\.html$/ ).test( file );
+		}),
+		options: {
+			page: {
+				viewportSize: { width: 700, height: 500 }
+			}
+		}
 	},
 	jshint: {
 		options: {
diff --git a/tests/unit/dialog/dialog_events.js b/tests/unit/dialog/dialog_events.js
index 1384500f68e..2af9990a898 100644
--- a/tests/unit/dialog/dialog_events.js
+++ b/tests/unit/dialog/dialog_events.js
@@ -361,9 +361,9 @@ test("ensure dialog keeps focus when clicking modal overlay", function() {
 	var element = $( "<div></div>" ).dialog({
 			modal: true
 		});
-	ok( $(":focus").closest(".ui-dialog").length, "focus is in dialog" );
+	equal( $( document.activeElement ).closest( ".ui-dialog" ).length, 1, "focus is in dialog" );
 	$(".ui-widget-overlay").simulate("mousedown");
-	ok( $(":focus").closest(".ui-dialog").length, "focus is still in dialog" );
+	equal( $( document.activeElement ).closest( ".ui-dialog" ).length, 1, "focus is still in dialog" );
 	element.remove();
 });
 
diff --git a/tests/unit/dialog/dialog_options.js b/tests/unit/dialog/dialog_options.js
index 66aeebde0be..87f3553bedc 100644
--- a/tests/unit/dialog/dialog_options.js
+++ b/tests/unit/dialog/dialog_options.js
@@ -558,7 +558,7 @@ asyncTest( "#4421 - Focus lost from dialog which uses show-effect", function() {
 	var element = $( "<div></div>" ).dialog({
 		show: "blind",
 		focus: function() {
-			equal( element.dialog( "widget" ).find( ":focus" ).length, 1, "dialog maintains focus" );
+			equal( element.dialog( "widget" ).find( document.activeElement ).length, 1, "dialog maintains focus" );
 			element.remove();
 			start();
 		}