added unit testing, and started implementing unit tests...phew

node_modules/lodash/_setWrapToString.js

@@ -0,0 +1,21 @@
+var getWrapDetails = require('./_getWrapDetails'),
+    insertWrapDetails = require('./_insertWrapDetails'),
+    setToString = require('./_setToString'),
+    updateWrapDetails = require('./_updateWrapDetails');
+
+/**
+ * Sets the `toString` method of `wrapper` to mimic the source of `reference`
+ * with wrapper details in a comment at the top of the source body.
+ *
+ * @private
+ * @param {Function} wrapper The function to modify.
+ * @param {Function} reference The reference function.
+ * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
+ * @returns {Function} Returns `wrapper`.
+ */
+function setWrapToString(wrapper, reference, bitmask) {
+  var source = (reference + '');
+  return setToString(wrapper, insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask)));
+}
+
+module.exports = setWrapToString;