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require 'spec_helper'
describe Immutable::Hash do
let(:hash) { H['a' => 1, 'b' => 2, 'c' => 3, 'd' => 4] }
let(:partition) { hash.partition { |k,v| v % 2 == 0 }}
describe '#partition' do
it 'returns a pair of Immutable::Hashes' do
partition.each { |h| h.class.should be(Immutable::Hash) }
partition.should be_frozen
end
it 'returns key/val pairs for which predicate is true in first Hash' do
partition[0].should == {'b' => 2, 'd' => 4}
end
it 'returns key/val pairs for which predicate is false in second Hash' do
partition[1].should == {'a' => 1, 'c' => 3}
end
it "doesn't modify the original Hash" do
partition
hash.should eql(H['a' => 1, 'b' => 2, 'c' => 3, 'd' => 4])
end
context 'from a subclass' do
it 'should return instances of the subclass' do
subclass = Class.new(Immutable::Hash)
instance = subclass.new('a' => 1, 'b' => 2, 'c' => 3, 'd' => 4)
partition = instance.partition { |k,v| v % 2 == 0 }
partition.each { |h| h.class.should be(subclass) }
end
end
end
end
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