Handle Promise rejections in RecentSearchesService spec (!11206)

spec/javascripts/filtered_search/services/recent_searches_service_spec.js

-/* eslint-disable promise/catch-or-return */
-
 import RecentSearchesService from '~/filtered_search/services/recent_searches_service';
+import RecentSearchesServiceError from '~/filtered_search/services/recent_searches_service_error';
 import AccessorUtilities from '~/lib/utils/accessor';
 
 describe('RecentSearchesService', () => {
@@ -22,11 +21,9 @@ describe('RecentSearchesService', () => {
       fetchItemsPromise
         .then((items) => {
           expect(items).toEqual([]);
-          done();
         })
-        .catch((err) => {
-          done.fail('Shouldn\'t reject with empty localStorage key', err);
-        });
+        .then(done)
+        .catch(done.fail);
     });
 
     it('should reject when unable to parse', (done) => {
@@ -34,19 +31,24 @@ describe('RecentSearchesService', () => {
       const fetchItemsPromise = service.fetch();
 
       fetchItemsPromise
+        .then(done.fail)
         .catch((error) => {
           expect(error).toEqual(jasmine.any(SyntaxError));
-          done();
-        });
+        })
+        .then(done)
+        .catch(done.fail);
     });
 
     it('should reject when service is unavailable', (done) => {
       RecentSearchesService.isAvailable.and.returnValue(false);
 
-      service.fetch().catch((error) => {
+      service.fetch()
+        .then(done.fail)
+        .catch((error) => {
           expect(error).toEqual(jasmine.any(Error));
-        done();
-      });
+        })
+        .then(done)
+        .catch(done.fail);
     });
 
     it('should return items from localStorage', (done) => {
@@ -56,8 +58,9 @@ describe('RecentSearchesService', () => {
       fetchItemsPromise
         .then((items) => {
           expect(items).toEqual(['foo', 'bar']);
-          done();
-        });
+        })
+        .then(done)
+        .catch(done.fail);
     });
 
     describe('if .isAvailable returns `false`', () => {
@@ -65,12 +68,17 @@ describe('RecentSearchesService', () => {
         RecentSearchesService.isAvailable.and.returnValue(false);
 
         spyOn(window.localStorage, 'getItem');
-
-        RecentSearchesService.prototype.fetch();
       });
 
-      it('should not call .getItem', () => {
+      it('should not call .getItem', (done) => {
+        RecentSearchesService.prototype.fetch()
+          .then(done.fail)
+          .catch((err) => {
+            expect(err).toEqual(new RecentSearchesServiceError());
             expect(window.localStorage.getItem).not.toHaveBeenCalled();
+          })
+          .then(done)
+          .catch(done.fail);
       });
     });
   });
@@ -105,11 +113,11 @@ describe('RecentSearchesService', () => {
         RecentSearchesService.isAvailable.and.returnValue(true);
 
         spyOn(JSON, 'stringify').and.returnValue(searchesString);
-
-        RecentSearchesService.prototype.save.call(recentSearchesService);
       });
 
       it('should call .setItem', () => {
+        RecentSearchesService.prototype.save.call(recentSearchesService);
+
         expect(window.localStorage.setItem).toHaveBeenCalledWith(localStorageKey, searchesString);
       });
     });
@@ -117,11 +125,11 @@ describe('RecentSearchesService', () => {
     describe('if .isAvailable returns `false`', () => {
       beforeEach(() => {
         RecentSearchesService.isAvailable.and.returnValue(false);
-
-        RecentSearchesService.prototype.save();
       });
 
       it('should not call .setItem', () => {
+        RecentSearchesService.prototype.save();
+
         expect(window.localStorage.setItem).not.toHaveBeenCalled();
       });
     });