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require File.expand_path('../../../../spec_helper', __FILE__)
require 'set'
# Note: Flatten make little sens on sorted sets, because SortedSets are not (by default)
# comparable. For a SortedSet to be both valid and nested, we need to define a comparison operator:
module SortedSet_FlattenSpecs
class ComparableSortedSet < SortedSet
def <=>(other)
return puts "#{other} vs #{self}" unless other.is_a?(ComparableSortedSet)
to_a <=> other.to_a
end
end
end
describe "SortedSet#flatten" do
it "returns a copy of self with each included SortedSet flattened" do
klass = SortedSet_FlattenSpecs::ComparableSortedSet
set = klass[klass[1,2], klass[3,4], klass[5,6,7], klass[8]]
flattened_set = set.flatten
flattened_set.should_not equal(set)
flattened_set.should == klass[1, 2, 3, 4, 5, 6, 7, 8]
end
end
describe "SortedSet#flatten!" do
it "flattens self" do
klass = SortedSet_FlattenSpecs::ComparableSortedSet
set = klass[klass[1,2], klass[3,4], klass[5,6,7], klass[8]]
set.flatten!
set.should == klass[1, 2, 3, 4, 5, 6, 7, 8]
end
it "returns self when self was modified" do
klass = SortedSet_FlattenSpecs::ComparableSortedSet
set = klass[klass[1,2], klass[3,4]]
set.flatten!.should equal(set)
end
it "returns nil when self was not modified" do
set = SortedSet[1, 2, 3, 4]
set.flatten!.should be_nil
end
end
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