t.Errorf("want %q, got %q", testPayload, string(resp))
		}
		t.Log("Roundtrip:", time.Since(start))
	})

	t.Run("localToRemoteErr", func(t *testing.T) {
		const testPayload = "Hello Grid World!"
		start := time.Now()
		resp, err := remoteConn.Request(context.Background(), handlerTest2, []byte(testPayload))
		t.Log("Roundtrip:", time.Since(start))
		if len(resp) != 0 {
			t.Errorf("want nil, got %q", string(resp))
		}

		LastPong:           time.Now().UnixNano(),
		BaseFlags:          parent.baseFlags,
		clientPingInterval: parent.clientPingInterval,
	}
}

// roundtrip performs a roundtrip, returning the first response.
// This cannot be used concurrently.
func (m *muxClient) roundtrip(h HandlerID, req []byte) ([]byte, error) {
	if m.init {
		return nil, errors.New("mux client already used")
	}
	m.init = true
	m.singleResp = true

}

// RoundTripper provides an interface for type roundtrip serialization.
type RoundTripper interface {
	msgp.Unmarshaler
	msgp.Marshaler
	msgp.Sizer

	comparable
}

// SingleHandler is a type safe handler for single roundtrip requests.
type SingleHandler[Req, Resp RoundTripper] struct {
	id            HandlerID
	sharedResp    bool

    component[builder] = codePointString
    val url = builder.build()
    val expected = component.canonicalize(codePointString)
    val actual = component[url]
    if (expected != actual) {
      fail("Roundtrip $component $codePoint $url $expected != $actual")
    }
  }

  private fun testParseOriginal(
    codePoint: Int,
    codePointString: String,
    encoding: Encoding,
    component: Component,
  ) {

				return entries, io.EOF
			}
			if c.status == scanStateError || c.status == scanStateNone {
				o.ID = ""
				o.Create = false
				o.debugln("scan status", c.status, " - waiting a roundtrip to create")
			} else {
				// Continue listing
				o.ID = c.id
				go c.keepAlive(ctx, rpc)
			}
		}
	}

	if o.ID != "" && !o.Transient {
		// We have an existing list ID, continue streaming.

		}
		// Will get index or nil if closed.
		gotIdx = <-indexCh
		return gotIdx
	}
}

// compressSelfTest performs a self-test to ensure that compression
// algorithms completes a roundtrip. If any algorithm
// produces an incorrect checksum it fails with a hard error.
//
// compressSelfTest tries to catch any issue in the compression implementation
// early instead of silently corrupting data.

	failOnErr(xl.AddVersion(fi))

	fi.VersionID = mustGetUUID()
	fi.DataDir = mustGetUUID()
	fi.Data = data2
	failOnErr(xl.AddVersion(fi))

	serialized, err := xl.AppendTo(nil)
	failOnErr(err)
	// Roundtrip data
	var xl2 xlMetaV2
	failOnErr(xl2.Load(serialized))

	// We should have one data entry
	list, err := xl2.data.list()
	failOnErr(err)
	if len(list) != 2 {
		t.Fatalf("want 1 entry, got %d", len(list))

			var decBuf bytes.Buffer
			decRdr := s2.NewReader(&rdrBuf)
			_, err = io.Copy(&decBuf, decRdr)
			if err != nil {
				t.Fatal(err)
			}

			if !bytes.Equal(tt.data, decBuf.Bytes()) {
				t.Errorf("roundtrip failed\n\t%q\n\t%q", tt.data, decBuf.Bytes())
			}
		})
	}
}

func Test_pathNeedsClean(t *testing.T) {
	type pathTest struct {
		path, result string
	}

	cleantests := []pathTest{