feat: add SecretManager mocking

src/main.ts

@@ -45,6 +45,8 @@ type HttpsFunctionOrCloudFunctionV1<T, U> = U extends HttpsFunction &
   ? HttpsFunction & Runnable<T>
   : CloudFunctionV1<T>;
 
+export { mockSecretManager } from './secretManager';
+
 // Re-exporting V1 (to reduce breakage)
 export {
   ContextOptions,

src/secretManager.ts

@@ -0,0 +1,6 @@
+/** Mock values returned by `functions.config()`. */
+export function mockSecretManager(conf: { [key: string]: any }) {
+  for (const [key, value] of Object.entries(conf)) {
+    process.env[key] = value;
+  }
+}