error: BadResource: Bad resource ID

import { describe, expect, it, run } from 'https://deno.land/x/tincan@1.0.1/mod.ts'
import { App } from '../../app.ts'

describe('Request properties', () => {
  it.only('should have default HTTP Request properties', async () => {
    const app = new App()
    app.get('/', (req, res) => {
      res.json({ url: req.url })
    })
    const listener = Deno.listen({ port: 8080, hostname: 'localhost' })

    setTimeout(() => {
      fetch(`http://localhost:8080`).then((res) => res.json()).then((json) => {
        expect(json).toEqual({ url: `http://localhost:8080/` }) 
      })
    }, 0)

    const conn = await listener.accept()
    const requests = Deno.serveHttp(conn)
    const { request, respondWith } = (await requests.nextRequest())!
    const response = await app.handler(request, conn)
    if (response) {
      respondWith(response)
      // Deno.close(conn.rid)
      
      listener.close()
    }
  })
})

Request properties > should have default HTTP Request properties => https://deno.land/x/tincan@1.0.1/src/runner.ts:166:10
error: BadResource: Bad resource ID
      Deno.close(conn.rid)
           ^
    at Object.close (ext:core/01_core.js:396:25)
    at ItNode.fn (file:///home/v1rtl/Coding/deno-libs/tinyhttp/tests/core/request.test.ts:29:12)
    at async wrappedFn (https://deno.land/x/tincan@1.0.1/src/runner.ts:141:9)

error: AssertionError: Test case is leaking 1 resource:
 - An inbound HTTP connection (rid 8) was accepted during the test, but not closed during the test. Close the inbound HTTP connection by calling `httpConn.close()`.
    at assert (ext:deno_web/00_infra.js:353:11)
    at resourceSanitizer (ext:cli/40_testing.js:414:5)
    at async Object.exitSanitizer [as fn] (ext:cli/40_testing.js:432:7)