You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mux_test.go
    path of file: ./repos/glider/pkg/smux
    
    the code of the file until where you have to start completion: package smux

import (
	"bytes"
	"testing"
)

type buffer struct {
	bytes.Buffer
}

func (b *buffer) Close() error {
	b.Buffer.Reset()
	return nil
}

func TestConfig(t *testing.T) {
	VerifyConfig(DefaultConfig())

	config := DefaultConfig()
	config.KeepAliveInterval = 0
	err := VerifyConfig(config)
	t.Log(err)
	if err == nil {
		t.Fatal(err)
	}

	config = DefaultConfig()
	config.KeepAliveInterval = 10
	config.KeepAliveTimeout = 5
	err = VerifyConfig(config)
	t.Log(err)
	if err == nil {
		t.Fatal(err)
	}

	config = DefaultConfig()
	config.MaxFrameSize = 0
	err = VerifyConfig(config)
	t.Log(err)
	if err == nil {
		t.Fatal(err)
	}

	config = DefaultConfig()
	config.MaxFrameSize = 65536
	err = VerifyConfig(config)
	t.Log(err)
	if err == nil {
		t.Fatal(err)
	}

	config
    
func TestConfig(t *testing.T) {
	VerifyConfig(DefaultConfig())

	config := DefaultConfig()
	config.KeepAliveInterval = 0
	err := VerifyConfig(config)
	t.Log(err)
	if err == nil {
		t.Fatal(err)
	}

	config = DefaultConfig()
	config.KeepAliveInterval = 10
	config.KeepAliveTimeout = 5
	err = VerifyConfig(config)
	t.Log(err)
	if err == nil {
		t.Fatal(err)
	}

	config = DefaultConfig()
	config.MaxFrameSize = 0
	err = VerifyConfig(config)
	t.Log(err)
	if err == nil {
		t.Fatal(err)
	}

	config = DefaultConfig()
	config.MaxFrameSize = 65536
	err = VerifyConfig(config)
	t.Log(err)
	if err == nil {
		t.Fatal(err)
	}

	config = DefaultConfig()
	config.MaxReceiveBuffer = 0
	err = VerifyConfig(config)
	t.Log(err)
	if err == nil {
		t.Fatal(err)
	}

	config = DefaultConfig()
	config.MaxStreamBuffer = 0
	err = VerifyConfig(config)
	t.Log(err)
	if err == nil {
		t.Fatal(err)
	}

	config = DefaultConfig()
	config.MaxStreamBuffer = 100
	config.MaxReceiveBuffer = 99
	err = VerifyConfig(config)
	t.Log(err)
	if err == nil {
		t.Fatal(err)
	}

	var bts buffer
	if _, err := Server(&bts, config); err == nil {
		t.Fatal("server started with wrong config")
	}

	if _, err := Client(&bts, config); err == nil {
		t.Fatal("client started with wrong config")
	}
}