spy 0.1.1

Rust spy functions for testing purposes
Documentation 
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# Spy [![Build Status](https://travis-ci.org/AlexPikalov/spy.svg?branch=master)](https://travis-ci.org/AlexPikalov/spy)
---
[Documentation](https://docs.rs/spy)

Spy crate is inspired by such famous Javascript testing tools
as Jasmine and Sinon.js. It provides easy configurable spies
with predefined behaviour.

```rust
#[test]
fn iterator_all_test() {
   let integers = vec![0i32, 1i32, 2i32];

   // create spy function that returns true if provided
   // argument is an even number
   let (spy_fn, spy) = spy!(|n| n % 2 == 0);

   // test call
   let res = integers.iter().all(spy_fn);

   // check Iterator::all result
   assert!(!res, "should be false");

   // take a snapshot of made calls
   let snapshot = spy.snapshot();

   // make assertions
   assert!(snapshot.called(), "should be called");
   assert!(
       snapshot.called_with(&(&1i32)),
       "should be called with 1i32 at least once"
   );
   assert!(
       !snapshot.each_called_with(&(&1i32)),
       "should be called with different arguments"
   );
   assert_eq!(snapshot.all_calls(), &vec![(&0i32), (&1i32)]);
   assert_eq!(snapshot.first_call().expect("should be Some"), &(&0i32));
   assert_eq!(snapshot.last_call().expect("should be Some"), &(&1i32));
   assert_eq!(snapshot.nth_call(1).expect("should be Some"), &(&1i32));
}
```

## LICENSE

Spy is licensed under [MIT](./LICENSE_MIT) and [Apache-2.0](./LICENSE_APACHE) license