Next.js API Routes Not Testable in Unit Tests

Your v0-generated Next.js API routes cannot be unit tested because they are tightly coupled to the Next.js request/response objects, database connections, and external service calls. Attempting to import and call route handlers in Jest or Vitest results in errors about missing Next.js runtime, unresolvable module imports, or database connection failures.

V0 generates API routes as standalone functions that directly use NextRequest, NextResponse, Prisma queries, and environment variables without any dependency injection or abstraction layer. This makes it impossible to test the business logic independently of the framework and infrastructure.

Without testable API routes, bugs slip into production because there is no automated way to verify that request validation, data transformation, error handling, and response formatting work correctly across all edge cases.