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require 'spec_helper'
describe Immutable::Hash do
[:reject, :delete_if].each do |method|
describe "##{method}" do
let(:hash) { H['A' => 'aye', 'B' => 'bee', 'C' => 'see'] }
context 'when nothing matches' do
it 'returns self' do
hash.send(method) { |key, value| false }.should equal(hash)
end
end
context 'when only some things match' do
context 'with a block' do
let(:result) { hash.send(method) { |key, value| key == 'A' && value == 'aye' }}
it 'preserves the original' do
result
hash.should eql(H['A' => 'aye', 'B' => 'bee', 'C' => 'see'])
end
it 'returns a set with the matching values' do
result.should eql(H['B' => 'bee', 'C' => 'see'])
end
it 'yields entries in the same order as #each' do
each_pairs = []
remove_pairs = []
hash.each_pair { |k,v| each_pairs << [k,v] }
hash.send(method) { |k,v| remove_pairs << [k,v] }
each_pairs.should == remove_pairs
end
end
context 'with no block' do
it 'returns an Enumerator' do
hash.send(method).class.should be(Enumerator)
hash.send(method).to_a.sort.should == [['A', 'aye'], ['B', 'bee'], ['C', 'see']]
hash.send(method).each { true }.should eql(H.empty)
end
end
context 'on a large hash, with many combinations of input' do
it 'still works' do
array = 1000.times.collect { |n| [n, n] }
hash = H.new(array)
[0, 10, 100, 200, 500, 800, 900, 999, 1000].each do |threshold|
result = hash.send(method) { |k,v| k >= threshold}
result.size.should == threshold
0.upto(threshold-1) { |n| result.key?(n).should == true }
threshold.upto(1000) { |n| result.key?(n).should == false }
end
# shouldn't have changed
hash.should eql(H.new(1000.times.collect { |n| [n, n] }))
end
end
end
end
end
end
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