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require 'spec_helper'
describe Immutable::Hash do
let(:hash) { H['A' => 'aye', 'B' => 'bee', 'C' => 'see'] }
[:each, :each_pair].each do |method|
describe "##{method}" do
context 'with a block (internal iteration)' do
it 'returns self' do
hash.send(method) {}.should be(hash)
end
it 'yields all key/value pairs' do
actual_pairs = {}
hash.send(method) { |key, value| actual_pairs[key] = value }
actual_pairs.should == { 'A' => 'aye', 'B' => 'bee', 'C' => 'see' }
end
it 'yields key/value pairs in the same order as #each_key and #each_value' do
hash.each.to_a.should eql(hash.each_key.zip(hash.each_value))
end
it 'yields both of a pair of colliding keys' do
yielded = []
hash = H[DeterministicHash.new('a', 1) => 1, DeterministicHash.new('b', 1) => 1]
hash.each { |k,v| yielded << k }
yielded.size.should == 2
yielded.map(&:value).sort.should == ['a', 'b']
end
it 'yields only the key to a block expecting |key,|' do
keys = []
hash.each { |key,| keys << key }
keys.sort.should == ['A', 'B', 'C']
end
end
context 'with no block' do
it 'returns an Enumerator' do
@result = hash.send(method)
@result.class.should be(Enumerator)
@result.to_a.should == hash.to_a
end
end
end
end
describe '#each_key' do
it 'yields all keys' do
keys = []
hash.each_key { |k| keys << k }
keys.sort.should == ['A', 'B', 'C']
end
context 'with no block' do
it 'returns an Enumerator' do
hash.each_key.class.should be(Enumerator)
hash.each_key.to_a.sort.should == ['A', 'B', 'C']
end
end
end
describe '#each_value' do
it 'yields all values' do
values = []
hash.each_value { |v| values << v }
values.sort.should == ['aye', 'bee', 'see']
end
context 'with no block' do
it 'returns an Enumerator' do
hash.each_value.class.should be(Enumerator)
hash.each_value.to_a.sort.should == ['aye', 'bee', 'see']
end
end
end
end
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