Ah good, thanks for the correction
On Nov 15, 2013 1:13 PM, "Myron Marston" <[email protected]> wrote:
> I believe the expectation matchers also now support === in RSpec 3.
>
>
> Not yet. Still on the list, but we haven't implemented it yet.
>
> That said, some matchers (such as the `yield` matchers) have supported
> `===` for a long time. In fact, that's how Maurizio's original example
> worked:
>
> expect { |b| described_class.new &b }.to yield_with_args described_class
>
> Class#=== returns true when given an instance of the class. No
> `instance_of` needed.
>
> However, Maurizio specifically said:
>
> But it tests only the yield argument type, not the object identity.
>
>
> Myron
>
> On Friday, November 15, 2013 9:53:02 AM UTC-8, Aaron Kromer wrote:
>>
>> Though that's not as explicit as Myron's example. I'd probably go with
>> his.
>>
>>
>> On Fri, Nov 15, 2013 at 12:52 PM, Aaron Kromer <[email protected]>wrote:
>>
>>> I believe the expectation matchers also now support === in RSpec 3. So
>>> you could write it as:
>>>
>>> it "works using expectation matcher" do
>>> expect{ |b| Foo.new(&b) }.to yield_with_args instance_of Fooend
>>>
>>>
>>>
>>> On Fri, Nov 15, 2013 at 10:59 AM, Myron Marston <[email protected]>wrote:
>>>
>>>> Thanks for trying out the 3.0 beta :).
>>>>
>>>> The yield matchers try to match the args with both `===` (for case
>>>> equality) and `==` (for exact equality) and in 1.9+, lambda's respond to
>>>> `===` by invoking their logic. So while it's a bit of a hack, this works:
>>>>
>>>> it 'works using a lambda' do
>>>> instance = nil
>>>> equals_the_instance = ->(arg) { arg.equal?(instance) }
>>>> expect { |b|
>>>> instance = Test.new(&b)
>>>> }.to yield_with_args(equals_the_instance)
>>>> end
>>>>
>>>> It works because passing the lambda causes it to be lazily evaluated.
>>>>
>>>> That said, I don't think the `yield_with_args` matcher offers you much
>>>> advantage in this case. It's simpler to do this:
>>>>
>>>> it 'works without the matcher' do
>>>> yielded = []
>>>> instance = Test.new { |a| yielded << a }
>>>> expect(yielded).to eq([instance])
>>>> end
>>>>
>>>> HTH,
>>>> Myron
>>>>
>>>> On Friday, November 15, 2013 2:36:20 AM UTC-8, Maurizio De Santis wrote:
>>>>>
>>>>> Hello,
>>>>>
>>>>> I'm using rspec 3.0.0.beta1. I'm trying to test for yield self.
>>>>> Example:
>>>>>
>>>>> class Test
>>>>> def initialize
>>>>> yield self if block_given?
>>>>> end
>>>>> end
>>>>>
>>>>> I can't figure out how to test it. This is the closest successful test
>>>>> I wrote:
>>>>>
>>>>> describe Test do
>>>>> context 'giving a block with one argument' do
>>>>> it 'yields itself'
>>>>> expect { |b| described_class.new &b }.to yield_with_args
>>>>> described_class
>>>>> end
>>>>> end
>>>>> end
>>>>>
>>>>> But it tests only the yield argument type, not the object identity.
>>>>>
>>>>> This is a failing test that goes close to the wanted result:
>>>>>
>>>>> describe Test do
>>>>> context 'giving a block with one argument' do
>>>>> it 'yields itself'
>>>>> instance = nil
>>>>> expect { |b|
>>>>> instance = described_class.new &b
>>>>> }.to yield_with_args instance
>>>>> end
>>>>> end
>>>>> end
>>>>>
>>>>> Indeed it fails, since that at the time that the last instanceoccurrence
>>>>> is evaluated its value is
>>>>> nil, so it doesn't match with instance value at the block evaluation
>>>>> time.
>>>>>
>>>>> Do you have some ideas about?
>>>>>
>>>>> Thank you
>>>>>
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>>>
>>>
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