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: factory_test.go
    path of file: ./repos/RxGo
    
    the code of the file until where you have to start completion: package rxgo

import (
	"context"
	"errors"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"go.uber.org/goleak"
)

func collect(ctx context.Context, ch <-chan Item) ([]interface{}, error) {
	s := make([]interface{}, 0)
	for {
		select {
		case <-ctx.Done():
			return nil, ctx.Err()
		case item, ok := 
    
func Test_Create_ContextCancelled(t *testing.T) {
	defer goleak.VerifyNone(t)
	closed1 := make(chan struct{})
	ctx, cancel := context.WithCancel(context.Background())
	Create([]Producer{
		func(ctx context.Context, next chan<- Item) {
			cancel()
		}, func(ctx context.Context, next chan<- Item) {
			<-ctx.Done()
			closed1 <- struct{}{}
		},
	}, WithContext(ctx)).Run()

	select {
	case <-time.Tick(time.Second):
		assert.FailNow(t, "producer not closed")
	case <-closed1:
	}
}