Add tests

And update max icon even if disabled

container/innerwindow.go

@@ -241,18 +241,18 @@ func (i *innerWindowRenderer) Refresh() {
 		i.buttons[1].SetOnTapped(i.win.OnMinimized)
 		i.buttons[1].Enable()
 	}
+
+	max := i.buttons[2]
 	if i.win.OnMaximized == nil {
 		i.buttons[2].Disable()
 	} else {
-		max := i.buttons[2]
 		max.SetOnTapped(i.win.OnMaximized)
 		max.Enable()
-
-		if i.win.maximized {
-			max.b.SetIcon(theme.ViewRestoreIcon())
-		} else {
-			max.b.SetIcon(theme.WindowMaximizeIcon())
-		}
+	}
+	if i.win.maximized {
+		max.b.SetIcon(theme.ViewRestoreIcon())
+	} else {
+		max.b.SetIcon(theme.WindowMaximizeIcon())
 	}
 
 	title := i.bar.Objects[0].(*fyne.Container).Objects[0].(*draggableLabel)

container/innerwindow_test.go

@@ -3,14 +3,31 @@ package container
 import (
 	"testing"
 
+	"github.com/stretchr/testify/assert"
+
 	"fyne.io/fyne/v2"
 	"fyne.io/fyne/v2/internal/cache"
 	"fyne.io/fyne/v2/test"
 	"fyne.io/fyne/v2/theme"
 	"fyne.io/fyne/v2/widget"
-	"github.com/stretchr/testify/assert"
 )
 
+func TestInnerWindow_Alignment(t *testing.T) {
+	w := NewInnerWindow("Title", widget.NewLabel("Content"))
+	w.Resize(fyne.NewSize(150, 100))
+	assert.Equal(t, widget.ButtonAlignCenter, w.Alignment)
+	assert.NotEqual(t, widget.ButtonAlignCenter, w.buttonPosition())
+
+	buttons := test.WidgetRenderer(w).(*innerWindowRenderer).buttonBox
+	w.Alignment = widget.ButtonAlignLeading
+	w.Refresh()
+	assert.Zero(t, buttons.Position().X)
+
+	w.Alignment = widget.ButtonAlignTrailing
+	w.Refresh()
+	assert.Greater(t, buttons.Position().X, float32(100))
+}
+
 func TestInnerWindow_Close(t *testing.T) {
 	w := NewInnerWindow("Thing", widget.NewLabel("Content"))
 
@@ -60,6 +77,16 @@ func TestInnerWindow_SetContent(t *testing.T) {
 	assert.Equal(t, "Content2", title.Objects[0].(*widget.Label).Text)
 }
 
+func TestInnerWindow_SetMaximized(t *testing.T) {
+	w := NewInnerWindow("Title", widget.NewLabel("Content"))
+
+	icon := test.WidgetRenderer(w).(*innerWindowRenderer).buttons[2]
+	assert.Equal(t, "foreground_maximize.svg", icon.b.Icon.Name())
+
+	w.SetMaximized(true)
+	assert.Equal(t, "foreground_view-zoom-fit.svg", icon.b.Icon.Name())
+}
+
 func TestInnerWindow_SetPadded(t *testing.T) {
 	w := NewInnerWindow("Title", widget.NewLabel("Content"))
 	minPadded := w.MinSize()