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require 'spec_helper'
describe Immutable::Set do
let(:set) { S['A', 'B', 'C'] }
describe '#delete' do
context 'with an existing value' do
it 'preserves the original' do
set.delete('B')
set.should eql(S['A', 'B', 'C'])
end
it 'returns a copy with the remaining values' do
set.delete('B').should eql(S['A', 'C'])
end
end
context 'with a non-existing value' do
it 'preserves the original values' do
set.delete('D')
set.should eql(S['A', 'B', 'C'])
end
it 'returns self' do
set.delete('D').should equal(set)
end
end
context 'when removing the last value in a set' do
it 'returns the canonical empty set' do
set.delete('B').delete('C').delete('A').should be(Immutable::EmptySet)
end
end
it 'works on large sets, with many combinations of input' do
array = 1000.times.map { %w[a b c d e f g h i j k l m n].sample(5).join }.uniq
set = S.new(array)
array.each do |key|
result = set.delete(key)
result.size.should == set.size - 1
result.include?(key).should == false
other = array.sample
(result.include?(other).should == true) if other != key
end
end
end
describe '#delete?' do
context 'with an existing value' do
it 'preserves the original' do
set.delete?('B')
set.should eql(S['A', 'B', 'C'])
end
it 'returns a copy with the remaining values' do
set.delete?('B').should eql(S['A', 'C'])
end
end
context 'with a non-existing value' do
it 'preserves the original values' do
set.delete?('D')
set.should eql(S['A', 'B', 'C'])
end
it 'returns false' do
set.delete?('D').should be(false)
end
end
end
end
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