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require "spec_helper"
require "hamster/set"
describe Hamster::Set do
[
[:sort, ->(left, right) { left.length <=> right.length }],
[:sort_by, ->(item) { item.length }],
].each do |method, comparator|
describe "##{method}" do
[
[[], []],
[["A"], ["A"]],
[%w[Ichi Ni San], %w[Ni San Ichi]],
].each do |values, expected|
describe "on #{values.inspect}" do
let(:set) { S[*values] }
describe "with a block" do
let(:result) { set.send(method, &comparator) }
it "returns #{expected.inspect}" do
result.should eql(SS.new(expected, &comparator))
result.to_a.should == expected
end
it "doesn't change the original Set" do
result
set.should eql(S.new(values))
end
end
describe "without a block" do
let(:result) { set.send(method) }
it "returns #{expected.sort.inspect}" do
result.should eql(SS[*expected])
result.to_a.should == expected.sort
end
it "doesn't change the original Set" do
result
set.should eql(S.new(values))
end
end
end
end
end
end
describe "#sort_by" do
it "only calls the passed block once for each item" do
count = 0
fn = lambda { |x| count += 1; -x }
items = 100.times.collect { rand(10000) }.uniq
S[*items].sort_by(&fn).to_a.should == items.sort.reverse
count.should == items.length
end
end
end
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