Angular Testing Course

Author: Your Name

src/app/courses/services/courses.service.ts

@@ -26,7 +26,6 @@ export class CoursesService {
             );
     }
 
-
     saveCourse(courseId:number, changes: Partial<Course>): Observable<Course> {
         return this.http.put<Course>(`/api/courses/${courseId}`, changes);
     }

src/app/courses/services/courses.services.spec.ts

@@ -3,6 +3,7 @@ import {TestBed} from '@angular/core/testing';
 import {HttpClientTestingModule, HttpTestingController} from '@angular/common/http/testing';
 import {COURSES} from '../../../../server/db-data';
 import {Course} from '../model/course';
+import {HttpErrorResponse} from '@angular/common/http';
 
 
 describe('CoursesService', () => {
@@ -69,8 +70,6 @@ describe('CoursesService', () => {
 
     });
 
-
-
     it('should save the course data', () => {
 
         const changes :Partial<Course> =
@@ -97,6 +96,27 @@ describe('CoursesService', () => {
 
     });
 
+    it('should give an error if save course fails', () => {
+
+        const changes :Partial<Course> =
+            {titles:{description: 'Testing Course'}};
+
+        coursesService.saveCourse(12, changes)
+            .subscribe(
+                () => fail("the save course operation should have failed"),
+
+                (error: HttpErrorResponse) => {
+                    expect(error.status).toBe(500);
+                }
+            );
+
+        const req = httpTestingController.expectOne('/api/courses/12');
+
+        expect(req.request.method).toEqual("PUT");
+
+        req.flush('Save course failed', {status:500,
+            statusText:'Internal Server Error'});
+    });
 
 
     afterEach(() => {
@@ -108,3 +128,15 @@ describe('CoursesService', () => {
 
 
 
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