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require "spec_helper"
require "hamster/list"
describe Hamster::List do
[:map, :collect].each do |method|
describe "##{method}" do
it "is lazy" do
-> { Hamster.stream { fail }.map { |item| item } }.should_not raise_error
end
[
[[], []],
[["A"], ["a"]],
[%w[A B C], %w[a b c]],
].each do |values, expected|
context "on #{values.inspect}" do
let(:list) { L[*values] }
context "with a block" do
it "preserves the original" do
list.send(method, &:downcase)
list.should eql(L[*values])
end
it "returns #{expected.inspect}" do
list.send(method, &:downcase).should eql(L[*expected])
end
it "is lazy" do
count = 0
list.send(method) { |item| count += 1 }
count.should <= 1
end
end
context "without a block" do
it "returns an Enumerator" do
list.send(method).class.should be(Enumerator)
list.send(method).each(&:downcase).should eql(L[*expected])
end
end
end
end
end
end
end
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