Added CatImageService to get the image url

projects/cat-service/src/lib/cat-image.service.spec.ts

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+import { CatImageService } from './cat-image.service';
+import { TestBed } from '@angular/core/testing';
+import { CatSearchMockService } from './cat-search-mock.service';
+import { CatSearchService } from './cat-search.service';
+import { of } from 'rxjs';
+
+describe('CatImageService', () => {
+
+    let service: CatImageService;
+    let mockService: CatSearchMockService;
+
+    beforeEach(() => {
+        TestBed.configureTestingModule({
+            imports: [],
+            providers: [{ provide: CatSearchService, useClass: CatSearchMockService }]
+        });
+
+        service = TestBed.get(CatImageService);
+        mockService = TestBed.get(CatSearchService);
+
+
+    });
+
+    it('should create the service', () => {
+        expect(service).toBeDefined();
+    });
+
+    describe('#getImageUrl', () => {
+
+        it('should return an url', () => {
+            spyOn(mockService, 'settings').and.returnValue(of({
+                result: { imageUrl: 'https://produktbilder.ihugendubel.de/{ean}_150x150.jpg?showDummy=true' }
+            }));
+            service.getImageUrl('testean123').subscribe((url) => {
+                expect(url).toBe('https://produktbilder.ihugendubel.de/testean123_150x150.jpg?showDummy=true');
+            });
+        });
+
+    });
+
+});

projects/cat-service/src/lib/cat-image.service.ts

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+import { Injectable } from '@angular/core';
+import { ItemDTO } from './dtos';
+import { CatSearchService } from './cat-search.service';
+import { Observable, of } from 'rxjs';
+import { map, catchError } from 'rxjs/operators';
+
+@Injectable({ providedIn: 'root' })
+export class CatImageService {
+
+    constructor(private catSearch: CatSearchService) { }
+
+    getImageUrl(ean: string): Observable<string> {
+        return this.catSearch.settings().pipe(
+            map(response => response.result.imageUrl),
+            map(url => url.replace('{ean}', ean)),
+            catchError(() => of(''))
+        );
+    }
+}