2901

Author: dakshitcodes

models/Notification.mock-integrations.test.ts

@@ -0,0 +1,131 @@
+import { describe, it, expect, beforeEach, vi, afterEach } from 'vitest';
+
+describe('Notification.ts - Asynchronous Service Layer Mocking & Local Cache Stubs', () => {
+  beforeEach(() => {
+    vi.useFakeTimers();
+  });
+
+  afterEach(() => {
+    vi.useRealTimers();
+    vi.clearAllMocks();
+  });
+
+  it('Mock standard asynchronous imports and databases using stubs', async () => {
+    // 1st condition: Mock standard async databases
+    const dbStub = {
+      fetchNotifications: vi.fn().mockResolvedValue([{ id: 1, title: 'Mock Notification' }]),
+    };
+
+    const result = await dbStub.fetchNotifications();
+
+    expect(dbStub.fetchNotifications).toHaveBeenCalledOnce();
+    expect(result).toHaveLength(1);
+    expect(result[0].title).toBe('Mock Notification');
+  });
+
+  it('Test service loading paths to ensure pending state overlays render', () => {
+    // 2nd condition: Ensure loading path updates overlay display
+    const overlay = document.createElement('div');
+    overlay.id = 'loading-overlay';
+    overlay.style.display = 'none';
+
+    const fetchServiceData = async () => {
+      // Trigger pending state
+      overlay.style.display = 'block';
+      await new Promise((resolve) => setTimeout(resolve, 500));
+      // Stop pending state
+      overlay.style.display = 'none';
+    };
+
+    const fetchPromise = fetchServiceData();
+
+    // Assert immediately before promise resolution
+    expect(overlay.style.display).toBe('block');
+  });
+
+  it('Assert local cache layers are queried before triggering database retrievals', async () => {
+    // 3rd condition: Assert local cache layers are queried strictly first
+    const callOrder: string[] = [];
+
+    const localCacheMock = {
+      get: vi.fn().mockImplementation(() => {
+        callOrder.push('query_cache');
+        return null;
+      }),
+    };
+
+    const remoteDbMock = {
+      retrieve: vi.fn().mockImplementation(async () => {
+        callOrder.push('trigger_db');
+        return 'Server Data';
+      }),
+    };
+
+    const getSynchronizedData = async () => {
+      const cached = localCacheMock.get('data_key');
+      if (cached) return cached;
+      return await remoteDbMock.retrieve();
+    };
+
+    const data = await getSynchronizedData();
+
+    expect(localCacheMock.get).toHaveBeenCalledOnce();
+    expect(remoteDbMock.retrieve).toHaveBeenCalledOnce();
+    // Cache must come first
+    expect(callOrder).toEqual(['query_cache', 'trigger_db']);
+    expect(data).toBe('Server Data');
+  });
+
+  it('Verify correct fallback procedures during fake endpoint timeout blocks', async () => {
+    // 4th condition: Fallback procedures during fake endpoint timeouts
+    const unstableEndpoint = {
+      fetch: vi.fn().mockImplementation(() => {
+        return new Promise((_, reject) => {
+          setTimeout(() => reject(new Error('Connection Timeout!')), 5000);
+        });
+      }),
+    };
+
+    let caughtTimeoutError = false;
+    let fallbackRendered = false;
+
+    const requestWithSafetyNet = async () => {
+      try {
+        await unstableEndpoint.fetch();
+      } catch (e: unknown) {
+        caughtTimeoutError = true;
+        fallbackRendered = true; // procedure trigger
+      }
+    };
+
+    const reqPromise = requestWithSafetyNet();
+
+    // Fast forward timeline to force the 5000ms fake-timeout block
+    vi.advanceTimersByTime(5000);
+    await reqPromise;
+
+    expect(caughtTimeoutError).toBe(true);
+    expect(fallbackRendered).toBe(true);
+  });
+
+  it('Assert complete cache sync is written on success callbacks', async () => {
+    // 5th condition: Assert complete cache sync object is written on success
+    const localCache = {
+      sync: vi.fn(),
+    };
+
+    const fetchAndSync = async () => {
+      // successful retrieval simulation
+      const dbResponseList = [{ id: 99, parsed: true }];
+
+      // writes directly on success callback
+      localCache.sync('notification_schema', dbResponseList);
+      return dbResponseList;
+    };
+
+    await fetchAndSync();
+
+    // verifies exactly that the object structure sync happened correctly
+    expect(localCache.sync).toHaveBeenCalledWith('notification_schema', [{ id: 99, parsed: true }]);
+  });
+});