test cases for summaries

WeatherWatch/backend/__tests__/weatherSummary.test.js

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+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import request from 'supertest';
+
+// Mock OpenAI client so tests stay offline and deterministic
+const mockCreate = vi.fn();
+
+describe('POST /api/weather-summary', () => {
+  let app;
+
+  beforeEach(async () => {
+    process.env.OPENAI_API_KEY = 'test-key';
+    process.env.NODE_ENV = 'test';
+    vi.resetModules();
+    mockCreate.mockReset().mockResolvedValue({ output_text: 'AI says hello.' });
+    global.__mockOpenAI = { responses: { create: mockCreate } };
+    const module = await import('../server');
+    app = module.default || module;
+  });
+
+  afterEach(() => {
+    delete global.__mockOpenAI;
+  });
+
+  it('returns AI summary when OpenAI responds', async () => {
+    const payload = { weatherData: { temp: 72, condition: 'Sunny' } };
+
+    const res = await request(app).post('/api/weather-summary').send(payload);
+
+    expect(res.status).toBe(200);
+    expect(res.body.summary).toBe('AI says hello.');
+    expect(mockCreate).toHaveBeenCalledWith(
+      expect.objectContaining({
+        model: 'gpt-5-nano',
+        input: expect.stringContaining('weather summary'),
+        store: true,
+      })
+    );
+  });
+
+  it('returns 400 when weatherData is missing', async () => {
+    const res = await request(app).post('/api/weather-summary').send({});
+
+    expect(res.status).toBe(400);
+    expect(res.body.error).toMatch(/weatherData is required/i);
+    expect(mockCreate).not.toHaveBeenCalled();
+  });
+
+  it('returns 500 when OpenAI call fails', async () => {
+    mockCreate.mockRejectedValueOnce(new Error('OpenAI down'));
+    const res = await request(app)
+      .post('/api/weather-summary')
+      .send({ weatherData: { temp: 60 } });
+
+    expect(res.status).toBe(500);
+    expect(res.body.error).toMatch(/failed to generate summary/i);
+  });
+});