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require 'spec_helper'
describe Immutable::Hash do
[:map, :collect].each do |method|
describe "##{method}" do
context 'when empty' do
it 'returns self' do
H.empty.send(method) {}.should equal(H.empty)
end
end
context 'when not empty' do
let(:hash) { H['A' => 'aye', 'B' => 'bee', 'C' => 'see'] }
context 'with a block' do
let(:mapped) { hash.send(method) { |key, value| [key.downcase, value.upcase] }}
it 'preserves the original values' do
mapped
hash.should eql(H['A' => 'aye', 'B' => 'bee', 'C' => 'see'])
end
it 'returns a new hash with the mapped values' do
mapped.should eql(H['a' => 'AYE', 'b' => 'BEE', 'c' => 'SEE'])
end
end
context 'with no block' do
it 'returns an Enumerator' do
hash.send(method).class.should be(Enumerator)
hash.send(method).each { |k,v| [k.downcase, v] }.should == hash.map { |k,v| [k.downcase, v] }
end
end
end
context 'from a subclass' do
it 'returns an instance of the subclass' do
subclass = Class.new(Immutable::Hash)
instance = subclass.new('a' => 'aye', 'b' => 'bee')
instance.map { |k,v| [k, v.upcase] }.class.should be(subclass)
end
end
end
end
end
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