Moved React Native Android unit tests to open source

Reviewed By: mkonicek

Differential Revision: D2685799

fb-gh-sync-id: 56f061df58641c8cb13fc16bad5f87039f0c49fb

ReactAndroid/src/test/java/com/facebook/react/bridge/CatalystTestHelper.java

@@ -0,0 +1,64 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+package com.facebook.react.bridge;
+
+import com.facebook.react.bridge.queue.CatalystQueueConfiguration;
+import com.facebook.react.bridge.queue.CatalystQueueConfigurationImpl;
+import com.facebook.react.bridge.queue.CatalystQueueConfigurationSpec;
+import com.facebook.react.bridge.queue.MessageQueueThreadSpec;
+import com.facebook.react.bridge.queue.QueueThreadExceptionHandler;
+import com.facebook.react.uimanager.UIManagerModule;
+
+import org.robolectric.RuntimeEnvironment;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+/**
+ * Utility for creating pre-configured instances of core react components for tests.
+ */
+public class CatalystTestHelper {
+
+  /**
+   * @return a ReactApplicationContext that has a CatalystInstance mock returned by
+   * {@link #createMockCatalystInstance}
+   */
+  public static ReactApplicationContext createCatalystContextForTest() {
+    ReactApplicationContext context =
+        new ReactApplicationContext(RuntimeEnvironment.application);
+    context.initializeWithInstance(createMockCatalystInstance());
+    return context;
+  }
+
+  /**
+   * @return a CatalystInstance mock that has a default working CatalystQueueConfiguration.
+   */
+  public static CatalystInstance createMockCatalystInstance() {
+    CatalystQueueConfigurationSpec spec = CatalystQueueConfigurationSpec.builder()
+        .setJSQueueThreadSpec(MessageQueueThreadSpec.mainThreadSpec())
+        .setNativeModulesQueueThreadSpec(MessageQueueThreadSpec.mainThreadSpec())
+        .build();
+    CatalystQueueConfiguration catalystQueueConfiguration = CatalystQueueConfigurationImpl.create(
+        spec,
+        new QueueThreadExceptionHandler() {
+          @Override
+          public void handleException(Exception e) {
+            throw new RuntimeException(e);
+          }
+        });
+
+    CatalystInstance reactInstance = mock(CatalystInstance.class);
+    when(reactInstance.getCatalystQueueConfiguration()).thenReturn(catalystQueueConfiguration);
+    when(reactInstance.getNativeModule(UIManagerModule.class))
+        .thenReturn(mock(UIManagerModule.class));
+
+    return reactInstance;
+  }
+}