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require 'spec_helper'
describe Immutable::Hash do
describe '#key' do
let(:hash) { H[a: 1, b: 1, c: 2, d: 3] }
it 'returns a key associated with the given value, if there is one' do
[:a, :b].include?(hash.key(1)).should == true
hash.key(2).should be(:c)
hash.key(3).should be(:d)
end
it 'returns nil if there is no key associated with the given value' do
hash.key(5).should be_nil
hash.key(0).should be_nil
end
it 'uses #== to compare values for equality' do
hash.key(EqualNotEql.new).should_not be_nil
hash.key(EqlNotEqual.new).should be_nil
end
it "doesn't use default block if value is not found" do
H.new(a: 1) { fail }.key(2).should be_nil
end
end
end
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