fix type error in tests

Author: alicewriteswrongs

static/js/util/redux_test.js

@@ -68,7 +68,12 @@ describe('redux helpers', () => {
     }));
     let actionList = [asyncActionCreator];
     let dispatchSpy = sinon.stub().returns(Promise.resolve());
-    let asyncDispatch = createdActionFunc => createdActionFunc(dispatchSpy);
+    let asyncDispatch = (createdActionFunc) => {
+      if ( typeof(createdActionFunc) === 'function' ) {
+        return createdActionFunc(dispatchSpy);
+      }
+    };
+
 
     let actions;
     beforeEach(() => {
@@ -84,7 +89,6 @@ describe('redux helpers', () => {
 
     it('should return an array of asyncActionCreators', () => {
       let [ { asyncActionCreator } ] = actions;
-      // (args) => dispatch(
       let dispatched = asyncActionCreator(2);
       assert.isFulfilled(dispatched);
       assert(dispatchSpy.calledWith({