File: union.rb

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describe :set_union, :shared => true do
  before :each do
    @set = Set[:a, :b, :c]
  end

  it "returns a new Set containing all elements of self and the passed Enumerable" do
    @set.send(@method, Set[:b, :d, :e]).should == Set[:a, :b, :c, :d, :e]
    @set.send(@method, [:b, :e]).should == Set[:a, :b, :c, :e]
  end

  it "raises an ArgumentError when passed a non-Enumerable" do
    lambda { @set.send(@method, 1) }.should raise_error(ArgumentError)
    lambda { @set.send(@method, Object.new) }.should raise_error(ArgumentError)
  end
end