>
> 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]<javascript:>
> > 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]<javascript:>
>> > 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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