Unit Tests

src/app/services/cart.servic.spec.ts

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+import { TestBed } from '@angular/core/testing';
+import { CartService } from './cart.service';
+import { ToastrModule, ToastrService } from 'ngx-toastr';
+import { HttpClientModule } from '@angular/common/http';
+
+describe('CartService', () => {
+  let service: CartService;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({
+      imports: [
+        ToastrModule.forRoot(),
+        HttpClientModule
+      ],
+      providers: [
+        CartService,
+      ]
+    });
+    service = TestBed.inject(CartService);
+  });
+
+  it('should be created', () => {
+    expect(service).toBeTruthy();
+  });
+
+  it('#should format a value to the ch-CH price format', () => {
+    const result = service.formatPrice(594);
+    expect(result).toBe('Fr. 594.–');
+  });
+
+  it('#should return a placeholder for instock icon color', () => {
+    const result = service.inStock(10);
+    expect(result).toBe('bi-check-circle-fill stockgreen');
+  });
+});

tsconfig.spec.json

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+/* To learn more about this file see: https://angular.io/config/tsconfig. */
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./out-tsc/spec",
+    "types": [
+      "jasmine"
+    ]
+  },
+  "include": [
+    "src/**/*.spec.ts",
+    "src/**/*.d.ts"
+  ]
+}