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require 'spec_helper'
describe Immutable::Hash do
describe '#empty?' do
[
[[], true],
[['A' => 'aye'], false],
[['A' => 'aye', 'B' => 'bee', 'C' => 'see'], false],
].each do |pairs, result|
it "returns #{result} for #{pairs.inspect}" do
H[*pairs].empty?.should == result
end
end
it 'returns true for empty hashes which have a default block' do
H.new { 'default' }.empty?.should == true
end
end
describe '.empty' do
it 'returns the canonical empty Hash' do
H.empty.should be_empty
H.empty.should be(Immutable::EmptyHash)
end
context 'from a subclass' do
it 'returns an empty instance of the subclass' do
subclass = Class.new(Immutable::Hash)
subclass.empty.class.should be subclass
subclass.empty.should be_empty
end
it 'calls overridden #initialize when creating empty Hash' do
subclass = Class.new(Immutable::Hash) do
def initialize
@variable = 'value'
end
end
subclass.empty.instance_variable_get(:@variable).should == 'value'
end
end
end
end
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