Add Range#minmax specs #777
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To replace the monkey-patch, let's use a Maybe 2.7.2/2.7.3 could be used as upper bound, but first we need ruby/ruby#3285 (comment) then. We can always adjust it later. |
core/range/minmax_spec.rb
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| describe 'without enumerating the range' do | ||
| before(:each) do | ||
| # Prevent enumeration, but allow members to respond_to? :succ |
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Could you clarify like: to respond_to?(:succ) => false?
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It's actually the opposite. This ensures they respond_to? :succ, but that if it is ever actually called, the test fails.
The MRI implementation checks that it could iterate from the range beginning via .succ, even if it does not actually end up calling it, so we need to ensure the objects respond to it.
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Either way, it means I should clarify the comment.
core/range/minmax_spec.rb
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| @x = mock('x') | ||
| @y = mock('y') | ||
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| @x.should_receive(:<=>).with(@y).any_number_of_times.and_return(-1) |
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A comment like # x < y would be helpful to read to understand the intent of those lines faster
This adds specs for Range#minmax, since the implementation provided by Enumerable is overidden as of 2.7, to try to skip enumerating the range.
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After going through the code a little more, I realized there were some edge cases I didn't include. I'll update with those soon, but I got distracted by stumbling across another bug in one of the edge cases, this time in both |
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The structure looks more readable now, thanks!
Regarding CI, Range#minmax on an inclusive range should raise RangeError on a beginless range seems a bug, can you file a ticket & use ruby_bug?
For Range#minmax on an exclusive range should raise RangeError on a beginless range it's just a different error message, so the spec should be adapted.
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@sambostock could you address my latest comments? Then it should be ready to merge. |
* Interestingly the previous commit worked fine on Ruby 2.7.2 on Linux but failed on macOS.
This adds specs documenting the behaviour of
Range#minmax, as updated in Ruby 2.7 (see #745). The specs specifically check that as of 2.7, simple ranges have theirminmaxcomputed in an optimized manner, without enumerating the range. They also check a few other cases, to ensure otherminmaxfunctionality works as expected.While writing these specs, I discovered a bug in the handling of non-numeric exclusive ranges in MRI, which I have submitted a fix for in ruby/ruby#3285. In the meantime, I have included a temporary monkey-patch, so the correct specs can be written.
Range#minmaxfix is releasedQuestions for Reviewers
Enumerable#minmax's specs should be duplicated?I initially had completely separate specs, but tried to reduce duplication by grouping them. I also experimented with shared examples, but I couldn't really get it to work and it produced specs that were unclear.