update worker idle memory limit

backend/jest.config.js

@@ -19,5 +19,6 @@ module.exports = {
     '!src/config/**',     /* exclude config and constants */
     '!src/logging/**'     /* exclude logging setup */
   ],
-  setupFilesAfterEnv: ['./jest.setup.js'] /* Global set up file */
+  setupFilesAfterEnv: ['./jest.setup.js'] /* Global set up file */,
+  workerIdleMemoryLimit: '512mb'
 };

backend/tests/routes/healthCheckRoutes.test.ts

@@ -0,0 +1,55 @@
+/* Unit tests for the health check routes */
+import request from 'supertest';
+import { API_URLS_V1, AUTH_RESPONSES } from '../../src/constants';
+import App from '../../src/app';
+import Config from 'simple-app-config';
+import HealthCheckController from '../../src/controllers/healthCheckController';
+
+/* Mock the controller functions */
+jest.mock('../../src/controllers/healthCheckController', () => ({
+  checkHealth: jest.fn().mockImplementation((req, res) => {
+    res.sendStatus(200);
+  })
+}));
+
+describe('Health Check Routes Tests', () => {
+  let appInstance: App;
+
+  beforeAll(() => {
+    appInstance = new App();
+  });
+
+  beforeEach(() => {
+    jest.restoreAllMocks();
+  });
+
+  describe('GET /healthCheck', () => {
+    it('should call HealthCheckController.checkHealth', async () => {
+      /* Make the API call */
+      const expressInstance = appInstance.getExpressApp();
+      await request(expressInstance).get(`${API_URLS_V1.HEALTH_CHECK}/healthCheck`).send({});
+
+      /* Test against expected */
+      expect(HealthCheckController.checkHealth).toHaveBeenCalled();
+    });
+
+    it('should fail when the rate limit is exceeded', async () => {
+      /* Call API `threshold` times so that next call will cause rating limiting */
+      const expressInstance = appInstance.getExpressApp();
+      const threshold: number = Config.get('RATE_LIMITING.HEALTH_CHECKS.HEALTH_CHECK.THRESHOLD');
+      for (let i = 0; i < threshold; i++) {
+        await request(expressInstance).get(`${API_URLS_V1.HEALTH_CHECK}/healthCheck`).send({});
+      }
+
+      /* Call API */
+      const response = await request(expressInstance)
+        .get(`${API_URLS_V1.HEALTH_CHECK}/healthCheck`)
+        .send({});
+
+      /* Test against expected */
+      expect(HealthCheckController.checkHealth).toHaveBeenCalled();
+      expect(response.statusCode).toBe(429);
+      expect(response.body.message).toBe(AUTH_RESPONSES._429_RATE_LIMIT_EXCEEDED);
+    });
+  });
+});