[Media Router] Allow casting new media to sink with existing route.

chrome/test/data/webui/media_router/route_details_tests.js

Index: chrome/test/data/webui/media_router/route_details_tests.js
diff --git a/chrome/test/data/webui/media_router/route_details_tests.js b/chrome/test/data/webui/media_router/route_details_tests.js
index 2d8d0741f9dd6ba16169181b6ef33dccbfaac771..da0f878d56e811d44be58bbc315fb19bcbb2d887 100644
--- a/chrome/test/data/webui/media_router/route_details_tests.js
+++ b/chrome/test/data/webui/media_router/route_details_tests.js
@@ -95,10 +95,22 @@ cr.define('route_details', function() {
       });
 
       // Tests for 'start-casting-to-route-click' event firing when the
-      // 'start-casting-to-route-button' button is clicked.
+      // 'start-casting-to-route-button' button is clicked when the current
+      // route is joinable.
       test('start casting to route button click', function(done) {
         details.addEventListener(
             'start-casting-to-route-click', function() { done(); });
+        details.route = fakeRouteTwo;
+        MockInteractions.tap(details.$['start-casting-to-route-button']);
+      });
+
+      // Tests for 'cast-new-media-click' event firing when the
+      // 'start-casting-to-route-button' button is clicked when the current
+      // route is not joinable.
+      test('start casting button click starts new media', function(done) {
+        details.addEventListener(
+            'cast-new-media-click', function() { done(); });
+        details.route = fakeRouteOne;
         MockInteractions.tap(details.$['start-casting-to-route-button']);
       });
 
@@ -117,6 +129,7 @@ cr.define('route_details', function() {
       test('route is undefined or set', function() {
         // |route| is initially undefined.
         assertEquals(undefined, details.route);
+        assertEquals(0, details.availableCastModes);
         checkDefaultViewIsShown();
 
         // Set |route|.
@@ -136,6 +149,23 @@ cr.define('route_details', function() {
         checkStartCastButtonIsShown();
       });
 
+      // Tests when |availableCastModes| is undefined or set.
+      test('route available cast modes undefined or set', function() {
+        details.route = fakeRouteOne;
+        assertEquals(0, details.availableCastModes);
+        assertFalse(details.route.canJoin);
+        checkStartCastButtonIsNotShown();
+
+        details.availableCastModes = 1;
+        checkStartCastButtonIsShown();
+
+        details.availableCastModes = 2;
+        checkStartCastButtonIsShown();
+
+        details.availableCastModes = 3;
+        checkStartCastButtonIsShown();
+      });
+
       // Tests when |route| exists, has a custom controller, and it loads.
       test('route has custom controller and loading succeeds', function(done) {
         var loadInvoked = false;