Use native as the source of truth to decide if a test should use Fabric

Reviewed By: fkgozali

Differential Revision: D7304221

fbshipit-source-id: cdd7053e6ce6522474df261db5710e2d9c013be6

Libraries/Components/View/TestFabricView.js

@@ -0,0 +1,24 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @providesModule TestFabricView
+ * @flow
+ * @format
+ */
+'use strict';
+
+/**
+ * This is a switch on the correct View to use for Fabric testing purposes
+ */
+let TestFabricView;
+const FabricTestModule = require('NativeModules').FabricTestModule;
+if (FabricTestModule && FabricTestModule.IS_FABRIC_ENABLED) {
+  TestFabricView = require('FabricView');
+} else {
+  TestFabricView = require('View');
+}
+
+module.exports = TestFabricView;

ReactAndroid/src/androidTest/java/com/facebook/react/testing/ReactInstrumentationTest.java

@@ -12,6 +12,7 @@ import android.test.ActivityInstrumentationTestCase2;
 import android.view.View;
 import android.view.ViewGroup;
 import com.facebook.react.bridge.ReactContext;
+import com.facebook.react.testing.fabric.FabricTestModule;
 import com.facebook.react.testing.idledetection.IdleWaiter;
 
 /**
@@ -110,7 +111,11 @@ public abstract class ReactInstrumentationTest extends
    * Override this method to provide extra native modules to be loaded before the app starts
    */
   protected ReactInstanceSpecForTest createReactInstanceSpecForTest() {
-    return new ReactInstanceSpecForTest();
+    ReactInstanceSpecForTest instanceSpec = new ReactInstanceSpecForTest();
+    if (isFabricTest()) {
+      instanceSpec.addNativeModule(new FabricTestModule(isFabricTest()));
+    }
+    return instanceSpec;
   }
 
   /**

ReactAndroid/src/androidTest/java/com/facebook/react/testing/fabric/FabricTestModule.java

@@ -0,0 +1,39 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.testing.fabric;
+
+import com.facebook.react.common.MapBuilder;
+import java.util.Map;
+import javax.annotation.Nullable;
+
+import com.facebook.react.bridge.BaseJavaModule;
+import com.facebook.react.bridge.ReactMethod;
+import com.facebook.react.bridge.ReadableArray;
+import com.facebook.react.bridge.ReadableMap;
+
+/**
+ * Module to indicate if a test is using Fabric
+ */
+public final class FabricTestModule extends BaseJavaModule {
+
+  private final boolean mIsFabricEnabled;
+
+  public FabricTestModule(boolean isFabricEnabled) {
+    mIsFabricEnabled = isFabricEnabled;
+  }
+
+  @Override
+  public String getName() {
+    return "FabricTestModule";
+  }
+
+  @Override
+  public Map<String, Object> getConstants() {
+    return MapBuilder.<String, Object>of("IS_FABRIC_ENABLED", mIsFabricEnabled);
+  }
+}