tea-time/presentation/07_matchers.slides

!SLIDE
# Matchers

!SLIDE even-larger
``` ruby
cat.meow.should == "meow"
cat.should be_a_kind_of(Cat)
cat.should_not be_hungry
  # => cat.hungry?.should == false
```

!SLIDE even-larger
``` coffeescript
expect(cat.meow()).toEqual("meow")
expect(cat.constructor).toEqual(Cat)
expect(cat.isHungry()).not.toBeTruthy()
```

!SLIDE even-larger
# Lots of built in matchers

``` coffeescript
toEqual(object)
toBeTruthy()
toBeFalsy()
toBeGreaterThan()
toBeLessThan()
toBeUndefined()
toContain()
toMatch()
```

!SLIDE even-larger
``` coffeescript
expect(cat.isHungry()).not.toBeTruthy()
```

!SLIDE
# Create your own matchers!

!SLIDE even-larger
``` coffeescript
MyMatchers =
  toBeHungry: ->
    return @actual.isHungry() == true

beforeEach ->
  this.addMatchers(MyMatchers)
```

!SLIDE even-larger
``` coffeescript
describe 'Cat', ->
  beforeEach ->
    @cat = new Cat()

  it 'should not be hungry', ->
    expect(@cat).not.toBeHungry()
```