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require "spec_helper"
require "hamster/set"
describe Hamster::Set do
[:difference, :subtract, :-].each do |method|
describe "##{method}" do
[
[[], [], []],
[["A"], [], ["A"]],
[["A"], ["A"], []],
[%w[A B C], ["B"], %w[A C]],
[%w[A B C], %w[A C], ["B"]],
[%w[A B C D E F G H], [], %w[A B C D E F G H]],
[%w[A B C M X Y Z], %w[B C D E F G H I J X], %w[A M Y Z]]
].each do |a, b, expected|
context "for #{a.inspect} and #{b.inspect}" do
let(:set_a) { S[*a] }
let(:set_b) { S[*b] }
let(:result) { set_a.send(method, set_b) }
it "doesn't modify the original Sets" do
result
set_a.should eql(S.new(a))
set_b.should eql(S.new(b))
end
it "returns #{expected.inspect}" do
result.should eql(S[*expected])
end
end
context "when passed a Ruby Array" do
it "returns the expected Set" do
S[*a].difference(b.freeze).should eql(S[*expected])
end
end
end
it "works on a wide variety of inputs" do
items = ('aa'..'zz').to_a
50.times do
array1 = items.sample(200)
array2 = items.sample(200)
result = S.new(array1).send(method, S.new(array2))
result.to_a.sort.should eql((array1 - array2).sort)
end
end
end
end
end
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