Add a test case for bug 659109

third_party/WebKit/LayoutTests/editing/inserting/insert-space.html

Index: third_party/WebKit/LayoutTests/editing/inserting/insert-space.html
diff --git a/third_party/WebKit/LayoutTests/editing/inserting/insert-space.html b/third_party/WebKit/LayoutTests/editing/inserting/insert-space.html
index f48cd44b7aba646402334cf283cafd2a74dbb39c..b207f0bf48a0768eb6570d30acfce8f0770eed44 100644
--- a/third_party/WebKit/LayoutTests/editing/inserting/insert-space.html
+++ b/third_party/WebKit/LayoutTests/editing/inserting/insert-space.html
@@ -47,4 +47,14 @@ test(() => assert_selection(
   },
   '<div contenteditable><p id="para">A\u00A0| B</p></div>'),
   'Insert a &nbsp; instead of plain space when it is inserted before the text node that has a leading plain space');
+
+test(() => assert_selection(
+  '<div contenteditable>|<br> </div>',
+  selection => {
+    selection.document.execCommand('insertText', false, ' ');
+    selection.document.execCommand('insertText', false, ' ');
+    selection.document.execCommand('insertText', false, ' ');
+  },
+  '<div contenteditable>\u00A0 \u00A0| </div>'),
+  'Insert spaces into the editable <div> that only has <br> and space as child');
 </script>