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

node_modules/@sinonjs/commons/lib/order-by-first-call.js

@@ -0,0 +1,18 @@
+"use strict";
+
+var sort = require("./prototypes/array").sort;
+var slice = require("./prototypes/array").slice;
+
+function comparator(a, b) {
+    // uuid, won't ever be equal
+    var aCall = a.getCall(0);
+    var bCall = b.getCall(0);
+    var aId = (aCall && aCall.callId) || -1;
+    var bId = (bCall && bCall.callId) || -1;
+
+    return aId < bId ? -1 : 1;
+}
+
+module.exports = function orderByFirstCall(spies) {
+    return sort(slice(spies), comparator);
+};