[ACS-4411] updateTag method added to tags service (#8200)

* [ACS-4411] added updateTag method to tags service & tests & docs

* [ACS-4411] docs formatting fix

* [ACS-4411] unit test fix

docs/content-services/services/tag.service.md

@@ -35,6 +35,11 @@ Manages tags in Content Services.
     Creates tags.
     -   _tags:_ `TagBody[]`  - List of tags to create.
     -   **Returns** [`Observable`](http://reactivex.io/documentation/observable.html)`<TagEntry[]>` - List of created tags.
+-   **updateTag**(tagId: `string`, tagBody: `TagBody`): [`Observable`](http://reactivex.io/documentation/observable.html)`<TagEntry>`<br/>
+    Updates a tag.
+    -   _tagId:_ `string`  - The identifier of a tag.
+    -   _tagBody:_ `TagBody`  - The updated tag.
+    -   **Returns** [`Observable`](http://reactivex.io/documentation/observable.html)`<TagEntry>` - Updated tag.
 -   **searchTags**(name: `string`, skipCount: `number`): [`Observable`](http://reactivex.io/documentation/observable.html)`<ResultSetPaging>`<br/>
     Find tags which name contains searched name.
     -   _name:_ `string`  - Value for name which should be used during searching tags.

lib/content-services/src/lib/tag/services/tag.service.spec.ts

@@ -168,5 +168,46 @@ describe('TagService', () => {
                 tick();
             }));
         });
+
+        describe('updateTag', () => {
+            const tag: TagEntry = {
+                entry: {
+                    tag: 'fake-tag',
+                    id: 'fake-node-id'
+                }
+            };
+            const tagBody: TagBody = {tag: 'updated-tag'};
+            const updatedTag: TagEntry = {
+                entry: {
+                    ...tagBody,
+                    id: 'fake-node-id'
+                }
+            };
+
+            it('should call updateTag on tagsApi', () => {
+                spyOn(service.tagsApi, 'updateTag').and.returnValue(Promise.resolve(updatedTag));
+
+                service.updateTag(tag.entry.id, tagBody);
+                expect(service.tagsApi.updateTag).toHaveBeenCalledWith(tag.entry.id, tagBody);
+            });
+
+            it('should emit refresh when tag updated successfully', fakeAsync(() => {
+                spyOn(service.refresh, 'emit');
+                spyOn(service.tagsApi, 'updateTag').and.returnValue(Promise.resolve(updatedTag));
+                service.updateTag(tag.entry.id, tagBody);
+                tick();
+                expect(service.refresh.emit).toHaveBeenCalledWith(updatedTag);
+            }));
+
+            it('should call error on logService when error occurs during tag update', fakeAsync(() => {
+                const logService: LogService = TestBed.inject(LogService);
+                spyOn(logService, 'error');
+                const error: string = 'Some error';
+                spyOn(service.tagsApi, 'updateTag').and.returnValue(Promise.reject(error));
+                service.updateTag(tag.entry.id, tagBody);
+                tick();
+                expect(logService.error).toHaveBeenCalledWith(error);
+            }));
+        });
     });
 });

lib/content-services/src/lib/tag/services/tag.service.ts

@@ -132,6 +132,22 @@ export class TagService {
         return observableAdd$;
     }
 
+    /**
+     * Update a tag
+     *
+     * @param tagId The identifier of a tag.
+     * @param tagBody The updated tag.
+     * @returns Updated tag.
+     */
+    updateTag(tagId: string, tagBody: TagBody): Observable<TagEntry> {
+        const observableUpdate$: Observable<TagEntry> = from(this.tagsApi.updateTag(tagId, tagBody));
+        observableUpdate$.subscribe(
+            (tagEntry: TagEntry) => this.refresh.emit(tagEntry),
+            (err) => this.handleError(err)
+        );
+        return observableUpdate$;
+    }
+
     /**
      * Find tags which name contains searched name.
      *