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require 'spec_helper'
describe Immutable::Hash do
describe '#invert' do
let(:hash) { H[a: 3, b: 2, c: 1] }
it 'uses the existing keys as values and values as keys' do
hash.invert.should eql(H[3 => :a, 2 => :b, 1 => :c])
end
it 'will select one key/value pair among multiple which have same value' do
[H[1 => :a],
H[1 => :b],
H[1 => :c]].include?(H[a: 1, b: 1, c: 1].invert).should == true
end
it "doesn't change the original Hash" do
hash.invert
hash.should eql(H[a: 3, b: 2, c: 1])
end
context 'from a subclass of Hash' do
it 'returns an instance of the subclass' do
subclass = Class.new(Immutable::Hash)
instance = subclass.new(a: 1, b: 2)
instance.invert.class.should be(subclass)
end
end
end
end
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