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require_relative '../../spec_helper'
require 'set'
describe "Set#flatten_merge" do
it "is protected" do
Set.should have_protected_instance_method("flatten_merge")
end
it "flattens the passed Set and merges it into self" do
set1 = Set[1, 2]
set2 = Set[3, 4, Set[5, 6]]
set1.send(:flatten_merge, set2).should == Set[1, 2, 3, 4, 5, 6]
end
it "raises an ArgumentError when trying to flatten a recursive Set" do
set1 = Set[1, 2, 3]
set2 = Set[5, 6, 7]
set2 << set2
lambda { set1.send(:flatten_merge, set2) }.should raise_error(ArgumentError)
end
end
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