[rspec-users] Stubbing Scopes

Christoph Schiessl chs at proactive.cc
Tue Feb 15 13:14:06 EST 2011


Thanks for your suggestion Justin, but I don't believe that the problem is time zone related. Time objects usually don't "loose" their Time Zone when performing operations on them. Here's an example for illustration:

$ rails console
Loading development environment (Rails 3.0.4)
ruby-1.8.7-p330 :001 > Time.zone.name
 => "Vienna" 
ruby-1.8.7-p330 :002 > t = Time.zone.now.beginning_of_month
 => Tue, 01 Feb 2011 00:00:00 CET +01:00 
ruby-1.8.7-p330 :003 > t += 3.hours
 => Tue, 01 Feb 2011 03:00:00 CET +01:00 
ruby-1.8.7-p330 :004 > t.beginning_of_day
 => Tue, 01 Feb 2011 00:00:00 CET +01:00 

If the should_receive arguments and actual arguments wouldn't be the same, then I would expect both examples below to fail.

  context ".on_day" do
    let(:start_of_day) { Time.zone.now.beginning_of_day }
    before { Interval.should_receive(:in_interval).with(start_of_day, start_of_day + 1.day).and_return("result") }
    # (1) Passing example:
    it { Interval.on_day(start_of_day + 3.hours) }
    # (2) Failing example:
    it { Interval.on_day(start_of_day + 3.hours).should == "result" }
  end

However, (1) is passing and (2) is failing. Output as before:

>>   Failure/Error: Allocation.on_day(start_of_day + 3.hours).should == "result"
>>   NoMethodError:
>>     undefined method `includes_values' for "result":String

Any ideas?

Best regards,
Christoph Schiessl

On Feb 15, 2011, at 18:51 , Justin Ko wrote:

> Your expectation (should_receive) is expecting "start_of_day", which
> uses Time.zone. The actual "on_day" scope does
> "day.to_time.beginning_of_day", which does not use any time zone.
> Therefore, the arguments to in_interval are not the same as the
> expectation. And because they are not the same, the mock does not get
> set. They must be exactly the same, since you are using a specific
> values.
> 
> You are not seeing a "the in_interval method was not called"
> expectation ouput message because of the "includes_values" error. This
> is because RSpec is comparing "result" with an array. This is because
> Rails scopes return arrays, not strings (it is not returning a string
> because the mock was never set).
> 
> Are you setting the time zone in a before block?
> 
> Here are two really nice gems for dealing with Time sensitive code:
> https://github.com/jtrupiano/timecop
> https://github.com/bebanjo/delorean
> 
> On Feb 15, 9:35 am, Christoph Schiessl <c... at proactive.cc> wrote:
>> Hi!
>> 
>> I'm trying to test the following (simplified) model:
>> 
>> class Allocation < ActiveRecord::Base
>>   scope :in_interval, (proc do |start_of_interval, end_of_interval|
>>     params = {:s => start_of_interval, :e => end_of_interval}
>>     where("(starts_at > :s AND starts_at < :e) OR (ends_at > :s AND ends_at < :e) OR (starts_at <= :s AND ends_at >= :e)", params)
>>   end)
>> 
>>   scope :on_day, (proc do |day|
>>     day = day.to_time.beginning_of_day
>>     in_interval(day, day + 1.day)
>>   end)
>> 
>>   # validations and other scopes...
>> end
>> 
>> I wrote a lot of specs for :in_interval - however testing :on_day is kind of problem. I don't want to duplicate any :in_interval specs - therefore I'm trying to stub :in_interval like this:
>> 
>> let(:start_of_day) { Time.zone.now.beginning_of_day }
>> it do
>>   Allocation.should_receive(:in_interval).with(start_of_day, start_of_day + 1.day).and_return("result")
>> 
>>   # working assertion - the :in_interval stub seems to get called as expected:
>>   # Allocation.on_day(start_of_day + 3.hours)
>> 
>>   # failing assertion:
>>   Allocation.on_day(start_of_day + 3.hours).should == "result"
>> end
>> 
>> RSpec Output:
>> 
>>   Failure/Error: Allocation.on_day(start_of_day + 3.hours).should == "result"
>>   NoMethodError:
>>     undefined method `includes_values' for "result":String
>> 
>> I'm using Rails 3.0.4 and RSpec 2.5 (latest versions).
>> 
>> Best regards,
>> Christoph Schiessl
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>> rspec-users mailing list
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