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

node_modules/@sinonjs/commons/lib/called-in-order.js

@@ -0,0 +1,34 @@
+"use strict";
+
+var every = require("./prototypes/array").every;
+
+function hasCallsLeft(callMap, spy) {
+    if (callMap[spy.id] === undefined) {
+        callMap[spy.id] = 0;
+    }
+
+    return callMap[spy.id] < spy.callCount;
+}
+
+function checkAdjacentCalls(callMap, spy, index, spies) {
+    var calledBeforeNext = true;
+
+    if (index !== spies.length - 1) {
+        calledBeforeNext = spy.calledBefore(spies[index + 1]);
+    }
+
+    if (hasCallsLeft(callMap, spy) && calledBeforeNext) {
+        callMap[spy.id] += 1;
+        return true;
+    }
+
+    return false;
+}
+
+module.exports = function calledInOrder(spies) {
+    var callMap = {};
+    // eslint-disable-next-line no-underscore-dangle
+    var _spies = arguments.length > 1 ? arguments : spies;
+
+    return every(_spies, checkAdjacentCalls.bind(null, callMap));
+};