ReferenceError: defineEventHandler is not defined errors. defineEventHandler is a Nitro-specific runtime utility that is not available in my test environment. The way my test is currently set up, I am trying to execute the middleware file directly, but defineEventHandler is not properly mocked. How could I do that? I haven't found any working online resources for examples of testing Nuxt server routes / Nitro routes with Vitest in a Nuxt project :/