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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Hash#invert" do
it "returns a new hash where keys are values and vice versa" do
new_hash(1 => 'a', 2 => 'b', 3 => 'c').invert.should ==
new_hash('a' => 1, 'b' => 2, 'c' => 3)
end
it "handles collisions by overriding with the key coming later in keys()" do
h = new_hash(:a => 1, :b => 1)
override_key = h.keys.last
h.invert[1].should == override_key
end
it "compares new keys with eql? semantics" do
h = new_hash(:a => 1.0, :b => 1)
i = h.invert
i[1.0].should == :a
i[1].should == :b
end
it "does not return subclass instances for subclasses" do
HashSpecs::MyHash[1 => 2, 3 => 4].invert.class.should == hash_class
HashSpecs::MyHash[].invert.class.should == hash_class
end
end
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