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Contents
require 'spec_helper'
require 'hamster/list'
describe Hamster::List do
describe "#take_while" do
it "is lazy" do
lambda { Hamster.stream { fail }.take_while { false } }.should_not raise_error
end
[
[[], []],
[["A"], ["A"]],
[["A", "B", "C"], ["A", "B"]],
].each do |values, expected|
describe "on #{values.inspect}" do
before do
@original = Hamster.list(*values)
@result = @original.take_while { |item| item < "C" }
end
describe "with a block" do
it "returns #{expected.inspect}" do
@result.should == Hamster.list(*expected)
end
it "preserves the original" do
@original.should == Hamster.list(*values)
end
it "is lazy" do
count = 0
@original.take_while { |item| count += 1; true }
count.should <= 1
end
end
describe "without a block" do
before do
@result = @original.take_while
end
it "returns self" do
@result.should equal(@original)
end
end
end
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems