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require_relative '../../spec_helper'
require 'set'
describe "Set#merge" do
it "adds the elements of the passed Enumerable to self" do
Set[:a, :b].merge(Set[:b, :c, :d]).should == Set[:a, :b, :c, :d]
Set[1, 2].merge([3, 4]).should == Set[1, 2, 3, 4]
end
it "returns self" do
set = Set[1, 2]
set.merge([3, 4]).should equal(set)
end
it "raises an ArgumentError when passed a non-Enumerable" do
-> { Set[1, 2].merge(1) }.should raise_error(ArgumentError)
-> { Set[1, 2].merge(Object.new) }.should raise_error(ArgumentError)
end
end
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