add: unit and integration testing

app/node_modules/jest-cli/bin/jest.js

@@ -0,0 +1,17 @@
+#!/usr/bin/env node
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+const importLocal = require('import-local');
+
+if (!importLocal(__filename)) {
+  if (process.env.NODE_ENV == null) {
+    process.env.NODE_ENV = 'test';
+  }
+
+  require('..').run();
+}