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require 'spec_helper'
describe Immutable::Hash do
describe '#delete' do
let(:hash) { H['A' => 'aye', 'B' => 'bee', 'C' => 'see'] }
context 'with an existing key' do
let(:result) { hash.delete('B') }
it 'preserves the original' do
hash.should eql(H['A' => 'aye', 'B' => 'bee', 'C' => 'see'])
end
it 'returns a copy with the remaining key/value pairs' do
result.should eql(H['A' => 'aye', 'C' => 'see'])
end
end
context 'with a non-existing key' do
let(:result) { hash.delete('D') }
it 'preserves the original values' do
hash.should eql(H['A' => 'aye', 'B' => 'bee', 'C' => 'see'])
end
it 'returns self' do
result.should equal(hash)
end
end
context 'when removing the last key' do
context 'from a Hash with no default block' do
it 'returns the canonical empty Hash' do
hash.delete('A').delete('B').delete('C').should be(Immutable::EmptyHash)
end
end
end
end
end
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