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require 'spec_helper'
describe Immutable::Hash do
describe '.new' do
it 'is amenable to overriding of #initialize' do
class SnazzyHash < Immutable::Hash
def initialize
super({'snazzy?' => 'oh yeah'})
end
end
SnazzyHash.new['snazzy?'].should == 'oh yeah'
end
context 'from a subclass' do
it 'returns a frozen instance of the subclass' do
subclass = Class.new(Immutable::Hash)
instance = subclass.new('some' => 'values')
instance.class.should be(subclass)
instance.frozen?.should be true
end
end
it 'accepts an array as initializer' do
H.new([['a', 'b'], ['c', 'd']]).should eql(H['a' => 'b', 'c' => 'd'])
end
it "returns a Hash which doesn't change even if initializer is mutated" do
rbhash = {a: 1, b: 2}
hash = H.new(rbhash)
rbhash[:a] = 'BAD'
hash.should eql(H[a: 1, b: 2])
end
end
describe '.[]' do
it 'accepts a Ruby Hash as initializer' do
hash = H[a: 1, b: 2]
hash.class.should be(Immutable::Hash)
hash.size.should == 2
hash.key?(:a).should == true
hash.key?(:b).should == true
end
it 'accepts a Immutable::Hash as initializer' do
hash = H[H.new(a: 1, b: 2)]
hash.class.should be(Immutable::Hash)
hash.size.should == 2
hash.key?(:a).should == true
hash.key?(:b).should == true
end
it 'accepts an array as initializer' do
hash = H[[[:a, 1], [:b, 2]]]
hash.class.should be(Immutable::Hash)
hash.size.should == 2
hash.key?(:a).should == true
hash.key?(:b).should == true
end
it 'can be used with a subclass of Immutable::Hash' do
subclass = Class.new(Immutable::Hash)
instance = subclass[a: 1, b: 2]
instance.class.should be(subclass)
instance.size.should == 2
instance.key?(:a).should == true
instance.key?(:b).should == true
end
end
end
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