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Contents
require File.expand_path('../../../spec_helper', __FILE__)
require 'hamster/tuple'
require 'hamster/list'
describe Hamster::List do
describe "#partition" do
it "is lazy" do
lambda { Hamster.stream { fail }.partition }.should_not raise_error
end
[
[[], [], []],
[[1], [1], []],
[[1, 2], [1], [2]],
[[1, 2, 3], [1, 3], [2]],
[[1, 2, 3, 4], [1, 3], [2, 4]],
[[2, 3, 4], [3], [2, 4]],
[[3, 4], [3], [4]],
[[4], [], [4]],
].each do |values, expected_matches, expected_remainder|
describe "on #{values.inspect}" do
before do
@original = Hamster.list(*values)
end
describe "with a block" do
before do
@result = @original.partition(&:odd?)
@matches = @result.first
@remainder = @result.last
end
it "preserves the original" do
@original.should == Hamster.list(*values)
end
it "returns a tuple with two items" do
@result.is_a?(Hamster::Tuple).should == true
end
it "correctly identifies the matches" do
@matches.should == Hamster.list(*expected_matches)
end
it "correctly identifies the remainder" do
@remainder.should == Hamster.list(*expected_remainder)
end
end
describe "without a block" do
before do
@result = @original.partition
end
it "returns self" do
@result.should equal(@original)
end
end
end
end
end
end
Version data entries
12 entries across 12 versions & 1 rubygems