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def should_be_a_subset(superset, records_selected_by_scope, &condition)
flunk "Your superset is empty" if superset.empty?
flunk "Your scope did not select any records" if records_selected_by_scope.empty?
records_selected_by_block, records_excluded_by_block = superset.partition(&condition)
flunk "Your test condition did not select any records" if records_selected_by_block.empty?
flunk "Your test condition did not exclude any records" if records_excluded_by_block.empty?
records_selected_by_scope.map(&:id).should =~ records_selected_by_block.map(&:id)
end
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seako commented Mar 22, 2013

so handy.

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