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: queue_test.go
    path of file: ./repos/fyne/internal/async
    
    the code of the file until where you have to start completion: package async_test

import (
	"image/color"
	"testing"

	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/canvas"
	"fyne.io/fyne/v2/internal/async"
)

func TestQueue(t *testing.T) {
	t.Run("empty", func(t *testing.T) {
		q := async.NewCanvasObjectQueue()
		if q.Out() != nil {
			t.Fatalf("dequeue empty queue returns non-nil")
		}
	})

	t.Run("length", func(t *testing.T) {
		q := async.NewCanvasObjectQueue()
		if q.Len() != 0 {
			t.Fatalf("empty queue has non-zero length")
		}

		obj := canvas.NewRectangle(color.Black)

		q.In(obj)
		if q.Len() != 1 {
			t.Fatalf("count of enqueue wrong, want %d, got %d.", 1, q.Len())
		}

		q.Out()
		if q.Len() != 0 {
			t.Fatalf("count of dequeue wrong, want %d, got %d", 0, q.Len())
		}
	})

	t.Run("in-out", func(t *testing.T) {
		q := async.NewCanvasObjectQueue()

		want :=
    
func TestQueue(t *testing.T) {
	t.Run("empty", func(t *testing.T) {
		q := async.NewCanvasObjectQueue()
		if q.Out() != nil {
			t.Fatalf("dequeue empty queue returns non-nil")
		}
	})

	t.Run("length", func(t *testing.T) {
		q := async.NewCanvasObjectQueue()
		if q.Len() != 0 {
			t.Fatalf("empty queue has non-zero length")
		}

		obj := canvas.NewRectangle(color.Black)

		q.In(obj)
		if q.Len() != 1 {
			t.Fatalf("count of enqueue wrong, want %d, got %d.", 1, q.Len())
		}

		q.Out()
		if q.Len() != 0 {
			t.Fatalf("count of dequeue wrong, want %d, got %d", 0, q.Len())
		}
	})

	t.Run("in-out", func(t *testing.T) {
		q := async.NewCanvasObjectQueue()

		want := []fyne.CanvasObject{
			canvas.NewRectangle(color.Black),
			canvas.NewRectangle(color.Black),
			canvas.NewRectangle(color.Black),
		}

		for i := 0; i < len(want); i++ {
			q.In(want[i])
		}

		var x []fyne.CanvasObject
		for {
			e := q.Out()
			if e == nil {
				break
			}
			x = append(x, e)
		}

		for i := 0; i < len(want); i++ {
			if x[i] != want[i] {
				t.Fatalf("input does not match output, want %+v, got %+v", want[i], x[i])
			}
		}
	})
}