test: add an empty node to the sample tree

Author: eush77

test/lib/ast.json

@@ -497,6 +497,15 @@
           "value": "MIT"
         }
       ]
+    },
+    {
+      "type": "div",
+      "children": [
+        {
+          "type": "div",
+          "children": []
+        }
+      ]
     }
   ]
-}
+}

test/select.js

@@ -165,9 +165,14 @@ test('structural pseudo-classes', function (t) {
       path(ast, [10, 2, 1]),
       path(ast, [10, 2, 2])
     ]);
-    t.deepEqual(select(ast, 'definition:nth-last-child(odd)')
+    t.deepEqual(select(ast, 'definition:nth-last-child(even)')
                 .map(function (node) { return node.identifier }),
                 ['viverra', 'interdum']);
+    t.deepEqual(select(ast,
+                       ':root > :nth-last-child(n+2):nth-last-child(-n+3)'), [
+                         path(ast, [16]),
+                         path(ast, [17])
+                       ]);
     t.end();
   });