Testing Server Functions with vitest (including validation + middleware)

const createUserSchema = z
  .object({
    name: z.string(),
    email: z.string().email(),
    role: z.enum(user_roles),
  })
  .strict()

export const createUser = createServerFn({ method: "POST" })
  .middleware([adminAuthorizationMiddleware])
  .validator(createUserSchema)
  .handler(async ({ data }) => {
    const result = await db
      .insert(user_table)
      .values({
        name: data.name,
        email: data.email,
        email_verified: false,
        role: data.role,
      })
      .returning()
      .then(res => res[0])

    console.log("Created user", result)
    return result
  })

test("validates email format", async () => {
  const name = "_TEST_" + faker.person.fullName()
  const invalidData = {
    name: name,
    email: name,
    role: "driver" as const,
  }

  // ERROR BELOW IS ALWAYS UNDEFINED
  const error = await createUser({
    data: invalidData,
  }).catch(e => e)

  // Check for specific validation error
  expect(error.message).toContain("Invalid email")
})