# Task

Override a specified method of an object with new functionality while still maintaining all of the old behaviour.

Create a spy that keeps track of how many times a function is called.

## Example

```js
var spy = Spy(console, 'error')

console.error('calling console.error')
console.error('calling console.error')
console.error('calling console.error')

console.log(spy.count) // 3
```

## Arguments

* target: an object containing the method `method`
* method: a string with the name of the method on `target` to spy on.

## Conditions

* Do not use any for/while loops or Array#forEach.
* Do not create any unnecessary functions e.g. helpers.

## Hint

* Functions have context, input and output. Make sure you consider the context, input to *and output from* the function you are spying on.

## Boilerplate

```js
function Spy(target, method) {
  // SOLUTION GOES HERE
}

module.exports = Spy
```