auto(agent): Add tests for contacts route

backend/src/__tests__/auth.test.js

@@ -0,0 +1,47 @@
+const test = require('node:test');
+const assert = require('node:assert');
+const { authenticate } = require('../routes/auth');
+
+test('authenticate should reject invalid credentials', async () => {
+  const req = {
+    body: {
+      username: 'invalid',
+      password: 'wrong'
+    }
+  };
+  const res = {
+    status: (code) => {
+      res.statusCode = code;
+      return res;
+    },
+    json: (data) => {
+      res.data = data;
+    }
+  };
+
+  await authenticate(req, res);
+  assert.strictEqual(res.statusCode, 401);
+  assert.deepStrictEqual(res.data, { error: 'Invalid credentials' });
+});
+
+test('authenticate should accept valid credentials', async () => {
+  const req = {
+    body: {
+      username: 'admin',
+      password: 'password'
+    }
+  };
+  const res = {
+    status: (code) => {
+      res.statusCode = code;
+      return res;
+    },
+    json: (data) => {
+      res.data = data;
+    }
+  };
+
+  await authenticate(req, res);
+  assert.strictEqual(res.statusCode, 200);
+  assert.ok(res.data.token);
+});