refactor(frontend): separate furniture inventory client (#7)

frontend/src/app/services/furniture-inventory.service.spec.ts

@@ -0,0 +1,30 @@
+import { provideHttpClient } from '@angular/common/http';
+import { HttpTestingController, provideHttpClientTesting } from '@angular/common/http/testing';
+import { TestBed } from '@angular/core/testing';
+import { FurnitureInventoryService } from './furniture-inventory.service';
+
+describe('FurnitureInventoryService', () => {
+  let service: FurnitureInventoryService;
+  let http: HttpTestingController;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({
+      providers: [provideHttpClient(), provideHttpClientTesting()],
+    });
+    service = TestBed.inject(FurnitureInventoryService);
+    http = TestBed.inject(HttpTestingController);
+  });
+
+  afterEach(() => http.verify());
+
+  it('uses the versioned furniture-inventory contract', () => {
+    service.getInventory('lease-1').subscribe();
+    http.expectOne('/api/leases/lease-1/inventory').flush({});
+
+    service.saveInventory('lease-1', { version: 4, lines: [] }).subscribe();
+    const request = http.expectOne('/api/leases/lease-1/inventory');
+    expect(request.request.method).toBe('PUT');
+    expect(request.request.body).toEqual({ version: 4, lines: [] });
+    request.flush({});
+  });
+});