options.spacing must be >= 0, #650

phetsims · Dec 16, 2020 · 126c62a · 126c62a
1 parent 71fd693
commit 126c62a
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/js/ZoomButtonGroup.js b/js/ZoomButtonGroup.js
@@ -65,6 +65,7 @@ class ZoomButtonGroup extends LayoutBox {
 
     assert && assert( !options.buttonOptions.content, 'ZoomButtonGroup sets buttonOptions.content' );
     assert && assert( !options.buttonOptions.listener, 'ZoomButtonGroup sets buttonOptions.listener' );
+    assert && assert( options.spacing >= 0, `invalid spacing: ${options.spacing}` );
 
     // zoom in
     const zoomInButton = new RectangularPushButton( merge( {}, options.buttonOptions, {