Adding unittests for media casting sink observation and route handling

chrome/android/junit/src/org/chromium/chrome/browser/media/router/cast/TestUtils.java

Index: chrome/android/junit/src/org/chromium/chrome/browser/media/router/cast/TestUtils.java
diff --git a/chrome/android/junit/src/org/chromium/chrome/browser/media/router/cast/TestUtils.java b/chrome/android/junit/src/org/chromium/chrome/browser/media/router/cast/TestUtils.java
new file mode 100644
index 0000000000000000000000000000000000000000..2ced15f650ad86549b8e12d65c2d44d07c730e0d
--- /dev/null
+++ b/chrome/android/junit/src/org/chromium/chrome/browser/media/router/cast/TestUtils.java
@@ -0,0 +1,33 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.media.router.cast;
+
+import android.support.v7.media.MediaRouter;
+import android.support.v7.media.MediaRouter.RouteInfo;
+
+import org.robolectric.internal.ReflectionHelpers;
+
+/**
+ * Utility classes and methods for MediaRouterTests.
+ */
+public class TestUtils {
+    /**
+     * Creates a mock {@link RouteInfo} to supply where needed in the tests.
+     * @param id The id of the route
+     * @param name The user friendly name of the route
+     * @return The initialized mock RouteInfo instance
+     */
+    static RouteInfo createMockRouteInfo(String id, String name) {
+        Class<?>[] paramClasses = new Class[] {
+                MediaRouter.ProviderInfo.class, String.class, String.class};
+        Object[] paramValues = new Object[] {null, "", ""};
+        RouteInfo routeInfo = ReflectionHelpers.callConstructorReflectively(
+                RouteInfo.class,
+                ReflectionHelpers.ClassParameter.fromComponentLists(paramClasses, paramValues));
+        ReflectionHelpers.setFieldReflectively(routeInfo, "mUniqueId", id);
+        ReflectionHelpers.setFieldReflectively(routeInfo, "mName", name);
+        return routeInfo;
+    }
+}