Updated the files.

my-app/node_modules/less/test/browser/runner-main-options.js

@@ -0,0 +1,17 @@
+var less = {
+    logLevel: 4,
+    errorReporting: 'console'
+};
+less.functions = {
+    add: function(a, b) {
+        return new(less.tree.Dimension)(a.value + b.value);
+    },
+    increment: function(a) {
+        return new(less.tree.Dimension)(a.value + 1);
+    },
+    _color: function(str) {
+        if (str.value === 'evil red') {
+            return new(less.tree.Color)('600');
+        }
+    }
+};