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: set_table_driven_concurrent_test.go
    path of file: ./repos/go-in-5-minutes/episode16
    
    the code of the file until where you have to start completion: // +build race_cond

package main

import (
	"fmt"
	"math/rand"
	"strconv"
	"testing"
	"time"
)

func init() {
	ran
    
func TestTableDrivenConcurrent(t *testing.T) {
	elts := []setElement{
		setElement{val: strconv.Itoa(rand.Int())},
		setElement{val: strconv.Itoa(rand.Int())},
		setElement{val: strconv.Itoa(rand.Int())},
		setElement{val: strconv.Itoa(rand.Int())},
		setElement{val: strconv.Itoa(rand.Int())},
		setElement{val: strconv.Itoa(rand.Int())},
	}
	st := newSet()
	for i, elt := range elts {
		go func(i int, elt setElement) {
			t.Run(fmt.Sprintf("element%d", i), func(t *testing.T) {
				if st.exists(elt) {
					t.Errorf("element %d reported as existing", i)
					return
				}
				if !st.add(elt) {
					t.Errorf("element %d reported as existing", i)
				}
				if !st.exists(elt) {
					t.Errorf("element %d reported as missing", i)
					return
				}
				if !st.remove(elt) {
					t.Errorf("element %d reported as not removed", i)
					return
				}
			})
		}(i, elt)
	}
}