fix length comparisons on xxxToProps functions

Testing finalMap{State|Dispatch}ToProps.length > 1 breaks when these functions are wrapped in generic decorator functions. Instead, test for !== 1.

Author: planetcohen

src/components/connect.js

@@ -28,8 +28,8 @@ export default function connect(mapStateToProps, mapDispatchToProps, mergeProps,
     wrapActionCreators(mapDispatchToProps) :
     mapDispatchToProps || defaultMapDispatchToProps
   const finalMergeProps = mergeProps || defaultMergeProps
-  const shouldUpdateStateProps = finalMapStateToProps.length > 1
-  const shouldUpdateDispatchProps = finalMapDispatchToProps.length > 1
+  const shouldUpdateStateProps = finalMapStateToProps.length !== 1
+  const shouldUpdateDispatchProps = finalMapDispatchToProps.length !== 1
   const { pure = true, withRef = false } = options
 
   // Helps track hot reloading.

test/components/connect.spec.js

@@ -426,10 +426,12 @@ describe('React', () => {
 
       let invocationCount = 0
 
-      @connect(() => {
+      /*eslint-disable no-unused-vars */
+      @connect((arg1) => {
         invocationCount++
         return {}
       })
+      /*eslint-enable no-unused-vars */
       class WithoutProps extends Component {
         render() {
           return <Passthrough {...this.props}/>
@@ -524,10 +526,12 @@ describe('React', () => {
 
       let invocationCount = 0
 
-      @connect(null, () => {
+      /*eslint-disable no-unused-vars */
+      @connect(null, (arg1) => {
         invocationCount++
         return {}
       })
+      /*eslint-enable no-unused-vars */
       class WithoutProps extends Component {
         render() {
           return <Passthrough {...this.props}/>