feat(ratingMenu): implement canRefine (#4691)

* feat(ratingMenu): implement canRefine

* update canRefine

Author: Eunjae Lee

src/connectors/rating-menu/__tests__/connectRatingMenu-test.js

@@ -467,6 +467,7 @@ See documentation: https://www.algolia.com/doc/api-reference/widgets/rating-menu
         grade: {
           items: [],
           createURL: expect.any(Function),
+          canRefine: false,
           refine: expect.any(Function),
           sendEvent: expect.any(Function),
           hasNoResults: true,
@@ -546,6 +547,7 @@ See documentation: https://www.algolia.com/doc/api-reference/widgets/rating-menu
             },
           ],
           createURL: expect.any(Function),
+          canRefine: true,
           refine: expect.any(Function),
           sendEvent: renderState1.ratingMenu.grade.sendEvent,
           hasNoResults: true,
@@ -581,6 +583,7 @@ See documentation: https://www.algolia.com/doc/api-reference/widgets/rating-menu
       expect(renderState1).toEqual({
         items: [],
         createURL: expect.any(Function),
+        canRefine: false,
         refine: expect.any(Function),
         sendEvent: expect.any(Function),
         hasNoResults: true,
@@ -658,6 +661,7 @@ See documentation: https://www.algolia.com/doc/api-reference/widgets/rating-menu
           },
         ],
         createURL: expect.any(Function),
+        canRefine: true,
         refine: expect.any(Function),
         sendEvent: renderState1.sendEvent,
         hasNoResults: true,

src/connectors/rating-menu/connectRatingMenu.js

@@ -66,6 +66,7 @@ const createSendEvent = ({
  * @property {StarRatingItems[]} items Possible star ratings the user can apply.
  * @property {function(string): string} createURL Creates an URL for the next
  * state (takes the item value as parameter). Takes the value of an item as parameter.
+ * @property {boolean} canRefine Indicates if search state can be refined.
  * @property {function(string)} refine Selects a rating to filter the results
  * (takes the filter value as parameter). Takes the value of an item as parameter.
  * @property {boolean} hasNoResults `true` if the last search contains no result.
@@ -328,6 +329,7 @@ ${
         return {
           items: facetValues,
           hasNoResults: results ? results.nbHits === 0 : true,
+          canRefine: facetValues.length > 0,
           refine: connectorState.toggleRefinementFactory(helper),
           sendEvent,
           createURL: connectorState.createURLFactory({ state, createURL }),