Add tests for the new async types

internal/async/vector_test.go

@@ -0,0 +1,54 @@
+package async_test
+
+import (
+	"testing"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/internal/async"
+	"github.com/stretchr/testify/assert"
+)
+
+var globalSize fyne.Size
+
+func BenchmarkAtomicLoadAndStore(b *testing.B) {
+	local := fyne.Size{}
+	size := async.Size{}
+
+	// Each loop iteration replicates how .Resize() in BaseWidget checks size changes.
+	for i := 0; i < b.N; i++ {
+		new := fyne.Size{Width: float32(i), Height: float32(i)}
+		if new == size.Load() {
+			continue
+		}
+
+		size.Store(new)
+	}
+
+	globalSize = local
+}
+
+func TestSize(t *testing.T) {
+	size := async.Size{}
+	assert.Equal(t, fyne.Size{}, size.Load())
+
+	square := fyne.NewSquareSize(100)
+	size.Store(square)
+	assert.Equal(t, square, size.Load())
+
+	uneven := fyne.NewSize(125, 600)
+	size.Store(uneven)
+	assert.Equal(t, uneven, size.Load())
+}
+
+func TestPosition(t *testing.T) {
+	pos := async.Position{}
+	assert.Equal(t, fyne.Position{}, pos.Load())
+
+	even := fyne.NewSquareOffsetPos(100)
+	pos.Store(even)
+	assert.Equal(t, even, pos.Load())
+
+	uneven := fyne.NewPos(125, 600)
+	pos.Store(uneven)
+	assert.Equal(t, uneven, pos.Load())
+}