Tests if the book is initialized with a rating of 0

Author: Gregor Woiwode

book-rating/src/app/shared/book.spec.ts

@@ -9,6 +9,10 @@ import {Book} from './book';
 
 describe('Book', () => {
   it('should create an instance', () => {
-    expect(new Book()).toBeTruthy();
+    expect(new Book('a', 'b', 1)).toBeTruthy();
+  });
+
+  it('has a rating of 0', () => {
+    expect(new Book('a', 'b').rating).toEqual(0);
   });
 });

book-rating/src/app/shared/book.ts

@@ -1,5 +1,5 @@
 export class Book {
   constructor(public title: string, 
               public description: string,
-              public rating: number) { }
+              public rating: number = 0) { }
 }