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require 'spec_helper'
describe Immutable::Set do
[:group_by, :group, :classify].each do |method|
describe "##{method}" do
context 'with a block' do
[
[[], []],
[[1], [true => S[1]]],
[[1, 2, 3, 4], [true => S[3, 1], false => S[4, 2]]],
].each do |values, expected|
context "on #{values.inspect}" do
let(:set) { S[*values] }
it "returns #{expected.inspect}" do
set.send(method, &:odd?).should eql(H[*expected])
set.should eql(S.new(values)) # make sure it hasn't changed
end
end
end
end
context 'without a block' do
[
[[], []],
[[1], [1 => S[1]]],
[[1, 2, 3, 4], [1 => S[1], 2 => S[2], 3 => S[3], 4 => S[4]]],
].each do |values, expected|
context "on #{values.inspect}" do
let(:set) { S[*values] }
it "returns #{expected.inspect}" do
set.group_by.should eql(H[*expected])
set.should eql(S.new(values)) # make sure it hasn't changed
end
end
end
end
context 'on an empty set' do
it 'returns an empty hash' do
S.empty.group_by { |x| x }.should eql(H.empty)
end
end
it 'returns a hash without default proc' do
S[1,2,3].group_by { |x| x }.default_proc.should be_nil
end
context 'from a subclass' do
it 'returns an Hash whose values are instances of the subclass' do
subclass = Class.new(Immutable::Set)
instance = subclass.new([1, 'string', :symbol])
instance.group_by(&:class).values.each { |v| v.class.should be(subclass) }
end
end
end
end
end
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