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

node_modules/@sinonjs/commons/lib/class-name.test.js

@@ -0,0 +1,37 @@
+"use strict";
+/* eslint-disable no-empty-function */
+
+var assert = require("@sinonjs/referee").assert;
+var className = require("./class-name");
+
+describe("className", function() {
+    it("returns the class name of an instance", function() {
+        // Because eslint-config-sinon disables es6, we can't
+        // use a class definition here
+        // https://github.com/sinonjs/eslint-config-sinon/blob/master/index.js
+        // var instance = new (class TestClass {})();
+        var instance = new function TestClass() {}();
+        var name = className(instance);
+        assert.equals(name, "TestClass");
+    });
+
+    it("returns 'Object' for {}", function() {
+        var name = className({});
+        assert.equals(name, "Object");
+    });
+
+    it("returns null for an object that has no prototype", function() {
+        var obj = Object.create(null);
+        var name = className(obj);
+        assert.equals(name, null);
+    });
+
+    it("returns null for an object whose prototype was mangled", function() {
+        // This is what Node v6 and v7 do for objects returned by querystring.parse()
+        function MangledObject() {}
+        MangledObject.prototype = Object.create(null);
+        var obj = new MangledObject();
+        var name = className(obj);
+        assert.equals(name, null);
+    });
+});