Testing

client/mocks/services/mock.api.service.ts

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+import { of } from "rxjs";
+
+export class MockApiService {
+  getCylinders = jest.fn().mockReturnValue(of([{ name: 'Cylinder 1' }]));
+  getKeys = jest.fn().mockReturnValue(of([{ name: 'Key 1' }]));
+  deleteKey = jest.fn().mockReturnValue(of({}));
+  updateKey = jest.fn().mockReturnValue(
+      of([])
+    );
+  getKeyArchive = jest.fn().mockReturnValue(of([{ name: 'Key 1' }]));
+}

client/mocks/services/mock.hottoast.service.ts

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+import { map } from "rxjs";
+
+jest.mock('@ngxpert/hot-toast', () => ({
+  HotToastService: {
+    observe:  jest.fn().mockImplementation(() => map(x => x))
+  },
+}));
+
+export class MockHotToastService {
+  observe = jest.fn().mockImplementation(() => map(x => x))
+};