Mock 与测试桩实战教程

def test_coupon_timeout_does_not_create_order(monkeypatch):
    def timeout_stub(*args, **kwargs):
        raise TimeoutError("coupon service timeout")

    monkeypatch.setattr(
        "order_service.coupon_client.calculate",
        timeout_stub,
    )

    result = create_order(user_id="u-1", sku_id="sku-1")

    assert result.code == "COUPON_SERVICE_UNAVAILABLE"
    assert result.order_id is None

{
  "request": {
    "method": "POST",
    "urlPath": "/payments/confirm",
    "bodyPatterns": [
      { "matchesJsonPath": "$.order_id" }
    ]
  },
  "response": {
    "status": 200,
    "jsonBody": {
      "payment_id": "pay-test-001",
      "status": "SUCCESS"
    },
    "fixedDelayMilliseconds": 800
  }
}

test('当库存不足时，页面提示用户修改数量', async ({ page }) => {
  await page.route('**/api/orders', async (route) => {
    await route.fulfill({
      status: 200,
      contentType: 'application/json',
      body: JSON.stringify({
        code: 'OUT_OF_STOCK',
        message: '库存不足'
      })
    });
  });

  await page.goto('/checkout');
  await page.getByRole('button', { name: '提交订单' }).click();

  await expect(page.getByText('库存不足')).toBeVisible();
  await expect(page.getByRole('button', { name: '修改数量' })).toBeVisible();
});