Add test for sync methods (type=sync)

Summary: Adds a test for synchronous methods (`type === 'sync'`) in NativeModules. This doesn't modify any behaviour.

Reviewed By: amnn

Differential Revision: D15804757

fbshipit-source-id: 4db76dbd0b0b111ed9311d4b7ec35a077c377f01

Author: motiz88

Libraries/BatchedBridge/__mocks__/MessageQueueTestConfig.js

@@ -18,16 +18,16 @@ const remoteModulesConfig: $ReadOnlyArray<ModuleConfig> = [
   [
     'RemoteModule1',
     null,
-    ['remoteMethod', 'promiseMethod', 'promiseReturningMethod'],
+    ['remoteMethod', 'promiseMethod', 'promiseReturningMethod', 'syncMethod'],
     [2 /* promiseReturningMethod */],
-    null,
+    [3 /* syncMethod */],
   ],
   [
     'RemoteModule2',
     null,
-    ['remoteMethod', 'promiseMethod', 'promiseReturningMethod'],
+    ['remoteMethod', 'promiseMethod', 'promiseReturningMethod', 'syncMethod'],
     [2 /* promiseReturningMethod */],
-    null,
+    [3 /* syncMethod */],
   ],
 ];
 

Libraries/BatchedBridge/__tests__/NativeModules-test.js

@@ -181,6 +181,53 @@ describe('MessageQueue', function() {
     }).toThrow();
     await promise2;
   });
+
+  describe('sync methods', () => {
+    afterEach(function() {
+      delete global.nativeCallSyncHook;
+    });
+
+    it('throwing an exception', function() {
+      global.nativeCallSyncHook = jest.fn(() => {
+        throw new Error('firstFailure');
+      });
+
+      let error;
+      try {
+        NativeModules.RemoteModule1.syncMethod('paloAlto', 'menloPark');
+      } catch (e) {
+        error = e;
+      }
+
+      expect(global.nativeCallSyncHook).toBeCalledTimes(1);
+      expect(global.nativeCallSyncHook).toBeCalledWith(
+        0, // `RemoteModule1`
+        3, // `syncMethod`
+        ['paloAlto', 'menloPark'],
+      );
+      expect(error).toBeInstanceOf(Error);
+      expect(error).toMatchObject({
+        message: 'firstFailure',
+      });
+    });
+
+    it('returning a value', function() {
+      global.nativeCallSyncHook = jest.fn(() => {
+        return 'secondSucc';
+      });
+
+      const result = NativeModules.RemoteModule2.syncMethod('mac', 'windows');
+
+      expect(global.nativeCallSyncHook).toBeCalledTimes(1);
+      expect(global.nativeCallSyncHook).toBeCalledWith(
+        1, // `RemoteModule2`
+        3, // `syncMethod`
+        ['mac', 'windows'],
+      );
+
+      expect(result).toBe('secondSucc');
+    });
+  });
 });
 
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