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require 'spec_helper'
describe Immutable::Hash do
describe '#except' do
let(:hash) { H['A' => 'aye', 'B' => 'bee', 'C' => 'see', nil => 'NIL'] }
context 'with only keys that the Hash has' do
it 'returns a Hash without those values' do
hash.except('B', nil).should eql(H['A' => 'aye', 'C' => 'see'])
end
it "doesn't change the original Hash" do
hash.except('B', nil)
hash.should eql(H['A' => 'aye', 'B' => 'bee', 'C' => 'see', nil => 'NIL'])
end
end
context "with keys that the Hash doesn't have" do
it 'returns a Hash without the values that it had keys for' do
hash.except('B', 'A', 3).should eql(H['C' => 'see', nil => 'NIL'])
end
it "doesn't change the original Hash" do
hash.except('B', 'A', 3)
hash.should eql(H['A' => 'aye', 'B' => 'bee', 'C' => 'see', nil => 'NIL'])
end
end
it 'works on a large Hash, with many combinations of input' do
keys = (1..1000).to_a
original = H.new(keys.zip(2..1001))
100.times do
to_remove = rand(100).times.collect { keys.sample }
result = original.except(*to_remove)
result.size.should == original.size - to_remove.uniq.size
to_remove.each { |key| result.key?(key).should == false }
(keys.sample(100) - to_remove).each { |key| result.key?(key).should == true }
end
original.should eql(H.new(keys.zip(2..1001))) # shouldn't have changed
end
end
end
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