rspec - why does this array key comparison fail?

Question

Failure/Error: @group.attributes.keys.should include (Group.first.attributes.keys)     
   expected 

["id", "duration", "frequency", "period", "group_size", "location", "service", "area_of_need", "created_at", "updated_at", "therapist_id", "start_date", "end_date", "student_id", "adhoc"] 
to include  
["id", "duration", "frequency", "period", "group_size", "location", "service", "area_of_need", "created_at", "updated_at", "therapist_id", "start_date", "end_date", "student_id", "adhoc"]

Test:

@group.attributes.keys.should include (Group.first.attributes.keys)

Nick Colgan · Accepted Answer · 2012-10-10 01:46:31Z

2

Because a.should includes(b) asserts that a.include? b is true andinclude? checks to see if an array's elements includes an object, not whether one array equals another

[1].include? [1]
=> false

[1].include? 1
=> true

[[1]].include? [1]
=> true

answered Oct 10, 2012 at 1:46

Nick Colgan

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Comments

Michael Durrant · Accepted Answer · 2012-10-26 01:29:47Z

1

Te answer was that the hash comparison fails on Ubuntu but works on Mac's.

My workaround is:

i=0
  while i < @group.attributes.count
  assert_equal @group.attributes[i], Group.first.attributes[i]
  i+= 1
end

# Comparing field by field as ruby hash comparison isn't working right - 
# but only on Ubuntu!

answered Oct 26, 2012 at 1:29

Michael Durrant

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