Guard Platform.isTesting under __DEV__

Summary: Testing is a __DEV__ time only, so let's optimize for prod bundles.

Reviewed By: ejanzer

Differential Revision: D13050583

fbshipit-source-id: a96e35e4d5f3bd09c235c11d4ece3e4d07882de7

Author: fkgozali

Libraries/Utilities/Platform.android.js

@@ -19,8 +19,11 @@ const Platform = {
     return constants && constants.Version;
   },
   get isTesting(): boolean {
-    const constants = NativeModules.PlatformConstants;
-    return constants && constants.isTesting;
+    if (__DEV__) {
+      const constants = NativeModules.PlatformConstants;
+      return constants && constants.isTesting;
+    }
+    return false;
   },
   get isTV(): boolean {
     const constants = NativeModules.PlatformConstants;

Libraries/Utilities/Platform.ios.js

@@ -33,8 +33,11 @@ const Platform = {
     return constants ? constants.interfaceIdiom === 'tv' : false;
   },
   get isTesting(): boolean {
-    const constants = NativeModules.PlatformConstants;
-    return constants && constants.isTesting;
+    if (__DEV__) {
+      const constants = NativeModules.PlatformConstants;
+      return constants && constants.isTesting;
+    }
+    return false;
   },
   select: (obj: Object) => ('ios' in obj ? obj.ios : obj.default),
 };