Add tests for error handling in backup, notification, and proxy host handlers; enhance certificate service with persistence tests; refactor backup service for scheduled backups; improve frontend form handling and add API tests for certificates, domains, and proxy hosts; implement frontend test coverage script.

frontend/src/api/__tests__/certificates.test.ts

@@ -0,0 +1,52 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import client from '../client';
+import { getCertificates, uploadCertificate, deleteCertificate, Certificate } from '../certificates';
+
+vi.mock('../client', () => ({
+  default: {
+    get: vi.fn(),
+    post: vi.fn(),
+    delete: vi.fn(),
+  },
+}));
+
+describe('certificates API', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  const mockCert: Certificate = {
+    id: 1,
+    domain: 'example.com',
+    issuer: 'Let\'s Encrypt',
+    expires_at: '2023-01-01',
+    status: 'valid',
+    provider: 'letsencrypt',
+  };
+
+  it('getCertificates calls client.get', async () => {
+    vi.mocked(client.get).mockResolvedValue({ data: [mockCert] });
+    const result = await getCertificates();
+    expect(client.get).toHaveBeenCalledWith('/certificates');
+    expect(result).toEqual([mockCert]);
+  });
+
+  it('uploadCertificate calls client.post with FormData', async () => {
+    vi.mocked(client.post).mockResolvedValue({ data: mockCert });
+    const certFile = new File(['cert'], 'cert.pem', { type: 'text/plain' });
+    const keyFile = new File(['key'], 'key.pem', { type: 'text/plain' });
+    
+    const result = await uploadCertificate('My Cert', certFile, keyFile);
+    
+    expect(client.post).toHaveBeenCalledWith('/certificates', expect.any(FormData), {
+      headers: { 'Content-Type': 'multipart/form-data' },
+    });
+    expect(result).toEqual(mockCert);
+  });
+
+  it('deleteCertificate calls client.delete', async () => {
+    vi.mocked(client.delete).mockResolvedValue({ data: {} });
+    await deleteCertificate(1);
+    expect(client.delete).toHaveBeenCalledWith('/certificates/1');
+  });
+});