Fix Jest mocks

Summary: Since we started relying on NativeModules' getConstants() method to access constants, we need to update our jest mocks of these NativeModules, so that the tests still pass. I do that in this diff.

Reviewed By: fkgozali

Differential Revision: D13561376

fbshipit-source-id: eaef3de82d842fd97d04be741d55bdded73c6a11

jest/setup.js

@@ -115,6 +115,12 @@ const mockNativeModules = {
   BuildInfo: {
     appVersion: '0',
     buildVersion: '0',
+    getConstants() {
+      return {
+        appVersion: '0',
+        buildVersion: '0',
+      };
+    },
   },
   Clipboard: {
     setString: jest.fn(),