func BenchmarkFixedFIFOEnqueueSingleGR(b *testing.B) {
	fifo := NewFixedFIFO(5)
	for i := 0; i < b.N; i++ {
		fifo.Enqueue(i)
	}
}
***************************************************************************************
** Enqueue
***************************************************************************************
single goroutine - enqueue 1 element
package goconcurrentqueue
import (
	"testing"
)