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describe :set_difference, shared: true do
before :each do
@set = Set[:a, :b, :c]
end
it "returns a new Set containing self's elements excluding the elements in the passed Enumerable" do
@set.send(@method, Set[:a, :b]).should == Set[:c]
@set.send(@method, [:b, :c]).should == Set[:a]
end
it "raises an ArgumentError when passed a non-Enumerable" do
-> { @set.send(@method, 1) }.should raise_error(ArgumentError)
-> { @set.send(@method, Object.new) }.should raise_error(ArgumentError)
end
end
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