i-spy

A super simple spying library that mimics the jasmine spy API for use with other frameworks. Doesn't force you into the stub / mock / fake choice like sinon.js.

Installation (nodejs)

  npm install i-spy

Api

createSpy()

Returns a function spy, optionally takes a function that will be executed when the spy is called.

var iSpy = require('i-spy');
var spy = iSpy.createSpy();
var spyWithAction(function () {
  console.log('hi');
});

spy();
spyWithAction(); //-> hi

spy.calls

A 2 dimentional array of all the recorded calls to the spy.

var spy = iSpy.createSpy();
 
spy('hello', 'world');
spy({foo: 'bar'});
 
spy.calls[0][0] // -> 'hello'
spy.calls[0][1] // -> 'world'
spy.calls[1][0] // -> '{foo: 'bar'}'

spy.wasCalled()

Returns a boolean that determines whether a spy has been called

var spy = iSpy.createSpy();
 
spy.wasCalled(); // -> false
 
spy('anything');
spy.wasCalled(); // -> true

spy.reset()

Clears any recorded calls on the spy

var spy = iSpy.createSpy();
 
spy(1);
spy.calls.length; // -> 1
 
spy.reset();
 
spy.calls.length; // -> 0

Usage

Simple usage:

   var iSpy = require('i-spy');
   var spy = iSpy.createSpy(function fake() {
     // do stuff
     return 'foo';
   });
 
   describe('frobnicator', function () {
 
      it('frobnicates', function () {
         frob.fronicate(spy);
         assert(spy.wasCalled());
         assert(spy.calls.length === 1);
         assert(spy.calls[0].length, 2);
      });
 
   });

Asynchronous tests:

   var iSpy = require('i-spy');
 
   describe('frobnicator', function () {
 
      it('frobnicates', function (done) {
        var spy = iSpy.createSpy(function fake(err, frobs) {
          // do stuff with frobs
          done(err);
        });
 
        frob.fronicate(spy);
 
        assert(spy.wasCalled());
        assert(spy.calls.length === 1);
        assert(spy.calls[0].length, 2);
        // Assert on err and frobs which are available through spy.calls
      });
 
   });

Spy behaviour can also be controlled via a fluent interface:

   var iSpy = require('i-spy');
 
   var erroringSpy = iSpy.createSpy().thatThrows(new Error('Oops'));
 
   var returningSpy = iSpy.createSpy().thatReturns('Woohoo');
 
   var callThroughSpy = iSpy.createSpy().thatCalls(function () {
       // Do some stuff
   });