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Contents
require File.expand_path('../../../spec_helper', __FILE__)
require 'hamster/list'
describe Hamster::List do
[:combinations, :combination].each do |method|
describe "##{method}" do
it "is lazy" do
lambda { Hamster.stream { fail }.combinations(2) }.should_not raise_error
end
[
[["A", "B", "C", "D"], 1, [["A"], ["B"], ["C"], ["D"]]],
[["A", "B", "C", "D"], 2, [["A", "B"], ["A", "C"], ["A", "D"], ["B", "C"], ["B", "D"], ["C", "D"]]],
[["A", "B", "C", "D"], 3, [["A", "B", "C"], ["A", "B", "D"], ["A", "C", "D"], ["B", "C", "D"]]],
[["A", "B", "C", "D"], 4, [["A", "B", "C", "D"]]],
[["A", "B", "C", "D"], 0, [[]]],
[["A", "B", "C", "D"], 5, []],
[[], 0, [[]]],
[[], 1, []],
].each do |values, number, expected|
expected = expected.map { |x| Hamster.list(*x) }
describe "on #{values.inspect} in groups of #{number}" do
before do
@original = Hamster.list(*values)
@result = @original.send(method, number)
end
it "preserves the original" do
@original.should == Hamster.list(*values)
end
it "returns #{expected.inspect}" do
@result.should == Hamster.list(*expected)
end
end
end
end
end
end
Version data entries
12 entries across 12 versions & 1 rubygems