* move 'identical' tests to separate file
* move 'identity' tests to separate file
* move 'ifElse' tests to separate file
* move 'includes' tests to separate file
* move 'indexBy' tests to separate file
* move 'indexOf' tests to separate file
* move 'init' tests to separate file
* move 'innerJoin' tests to separate file
* move 'insert' tests to separate file
* move 'insertAll' tests to separate file
* move 'intersection' tests to separate file
* move 'intersperse' tests to separate file
* move 'into' tests to separate file
* move 'invert' tests to separate file
* move 'invertObj' tests to separate file
* move 'invoker' tests to separate file
* move 'is' tests to separate file
* move 'isArrayLike' tests to separate file
* move 'isEmpty' tests to separate file
* move 'isNaN' tests to separate file