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require 'spec_helper'
describe Immutable::Hash do
let(:hash) { H['a' => 3, 'b' => 2, 'c' => 1] }
describe '#min' do
it 'returns the smallest key/val pair' do
hash.min.should == ['a', 3]
end
end
describe '#max' do
it 'returns the largest key/val pair' do
hash.max.should == ['c', 1]
end
end
describe '#min_by' do
it 'returns the smallest key/val pair (after passing it through a key function)' do
hash.min_by { |k,v| v }.should == ['c', 1]
end
it 'returns the first key/val pair yielded by #each in case of a tie' do
hash.min_by { 0 }.should == hash.each.first
end
it 'returns nil if the hash is empty' do
H.empty.min_by { |k,v| v }.should be_nil
end
end
describe '#max_by' do
it 'returns the largest key/val pair (after passing it through a key function)' do
hash.max_by { |k,v| v }.should == ['a', 3]
end
it 'returns the first key/val pair yielded by #each in case of a tie' do
hash.max_by { 0 }.should == hash.each.first
end
it 'returns nil if the hash is empty' do
H.empty.max_by { |k,v| v }.should be_nil
end
end
end
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