Add failing connect test

Author: istarkov

test/components/connect.spec.js

@@ -180,6 +180,51 @@ describe('React', () => {
       expect(div.props.pass).toEqual('through');
     });
 
+    it('should remove undefined props', () => {
+      const store = createStore(() => ({}));
+      let props = {x: true};
+      let container;
+
+      @connect(()=>({}), ()=>({}))
+      class ConnectContainer extends Component {
+        render() {
+          return (
+              <div {...this.props} />
+          );
+        }
+      }
+
+      class HolderContainer extends Component {
+        render() {
+          return (
+            <ConnectContainer {...props} />
+          );
+        }
+      }
+
+      TestUtils.renderIntoDocument(
+        <Provider store={store}>
+          {() => (
+            <HolderContainer ref={instance => container = instance} />
+          )}
+        </Provider>
+      );
+
+      const propsBefore = {
+        ...TestUtils.findRenderedDOMComponentWithTag(container, 'div').props
+      };
+
+      props = {};
+      container.forceUpdate();
+
+      const propsAfter = {
+        ...TestUtils.findRenderedDOMComponentWithTag(container, 'div').props
+      };
+
+      expect(propsBefore.x).toEqual(true);
+      expect(propsAfter.x).toNotEqual(true);
+    });
+
     it('should ignore deep mutations in props', () => {
       const store = createStore(() => ({
         foo: 'bar'