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: trylock_test.go
    path of file: ./repos/turn/internal/client
    
    the code of the file until where you have to start completion: // SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
// SPDX-License-Identifier: MIT

package client

import (
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
)

func TestTryLock(t *testing.T) {
	t.Run("success case", func(t *testing.T) {
		cl := &TryLock{}
		testFunc := func() error {
			if err := cl.Lock(); err != nil {
				return err
			}
			defer cl.Unlock()
			return nil
		}

		err := testFunc()
		assert.NoError(t, err, "should succeed")
		assert.Equal(t, int32(0), cl.n, "should match")
	})

	t.Run("failure case", func(t *testing.T) {
		cl := &TryLock{}
		testFunc := func() error {
			if err := cl.Lock(); err != nil {
				return err
			}
			defer cl.Unlock()
			time.Sleep(50 * time.Millisecond)
			return nil
		}

		var err1, er
    
func TestTryLock(t *testing.T) {
	t.Run("success case", func(t *testing.T) {
		cl := &TryLock{}
		testFunc := func() error {
			if err := cl.Lock(); err != nil {
				return err
			}
			defer cl.Unlock()
			return nil
		}

		err := testFunc()
		assert.NoError(t, err, "should succeed")
		assert.Equal(t, int32(0), cl.n, "should match")
	})

	t.Run("failure case", func(t *testing.T) {
		cl := &TryLock{}
		testFunc := func() error {
			if err := cl.Lock(); err != nil {
				return err
			}
			defer cl.Unlock()
			time.Sleep(50 * time.Millisecond)
			return nil
		}

		var err1, err2 error
		doneCh1 := make(chan struct{})
		doneCh2 := make(chan struct{})

		go func() {
			err1 = testFunc()
			close(doneCh1)
		}()
		go func() {
			err2 = testFunc()
			close(doneCh2)
		}()

		<-doneCh1
		<-doneCh2

		// Either one of them should fail
		if err1 == nil {
			assert.Error(t, err2, "should fail")
		} else {
			assert.Error(t, err1, "should fail")
		}
		assert.Equal(t, int32(0), cl.n, "should match")
	})
}