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

node_modules/just-extend/README.md

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+## just-extend
+
+Part of a [library](../../../../) of zero-dependency npm modules that do just do one thing.  
+Guilt-free utilities for every occasion.
+
+[Try it now](http://anguscroll.com/just/just-extend)
+
+```js
+import extend from 'just-extend';
+
+var obj = {a: 3, b: 5};
+extend(obj, {a: 4, c: 8}); // {a: 4, b: 5, c: 8}
+obj; // {a: 4, b: 5, c: 8}
+
+var obj = {a: 3, b: 5};
+extend({}, obj, {a: 4, c: 8}); // {a: 4, b: 5, c: 8}
+obj; // {a: 3, b: 5}
+
+var arr = [1, 2, 3];
+var obj = {a: 3, b: 5};
+extend(obj, {c: arr}); // {a: 3, b: 5, c: [1, 2, 3]}
+arr.push(4);
+obj; // {a: 3, b: 5, c: [1, 2, 3, 4]}
+
+var arr = [1, 2, 3];
+var obj = {a: 3, b: 5};
+extend(true, obj, {c: arr}); // {a: 3, b: 5, c: [1, 2, 3]}
+arr.push(4);
+obj; // {a: 3, b: 5, c: [1, 2, 3]}
+
+extend({a: 4, b: 5}); // {a: 4, b: 5}
+extend({a: 4, b: 5}, 3); {a: 4, b: 5}
+extend({a: 4, b: 5}, true); {a: 4, b: 5}
+extend('hello', {a: 4, b: 5}); // throws
+extend(3, {a: 4, b: 5}); // throws
+```