Add Running ES6 Specs With Mocha as a javascript til

README.md

@@ -138,6 +138,7 @@ _379 TILs and counting..._
 - [Numbers Are Empty](javascript/numbers-are-empty.md)
 - [Object Initialization With Shorthand Property Names](javascript/object-initialization-with-shorthand-property-names.md)
 - [Random Cannot Be Seeded](javascript/random-cannot-be-seeded.md)
+- [Running ES6 Specs With Mocha](javascript/running-es6-specs-with-mocha.md)
 - [Splat Arguments To A Function](javascript/splat-arguments-to-a-function.md)
 - [Throttling A Function Call](javascript/throttling-a-function-call.md)
 - [Transforming ES6 and JSX With Babel 6](javascript/transforming-es6-and-jsx-with-babel-6.md)

javascript/running-es6-specs-with-mocha.md

@@ -0,0 +1,16 @@
+# Running ES6 Specs With Mocha
+
+If your JavaScript specs contain ES6 syntax, [Mocha](https://mochajs.org/),
+by default, will not be able to interpret and run them. In order to run them
+with Mocha, you will need to tell Mocha to use something like
+[Babel](http://babeljs.io/) to compile them. The `--compile` flag can be
+used to point Mocha to the `babel-core/register` package.
+
+```
+$ mocha --compilers js:babel-core/register path/to/specs/*.spec.js
+```
+
+If you already have a test command specified in your `package.json` file,
+you can update it with the `--compile` portion of the above command.
+
+[source](http://jamesknelson.com/testing-in-es6-with-mocha-and-babel-6/)