Contents

require "spec_helper"

require "hamster/list"

describe Hamster::List do

  describe "#grep" do

    it "is lazy" do
      -> { Hamster.stream { fail }.grep(Object) { |item| item } }.should_not raise_error
    end

    describe "without a block" do

      [
        [[], []],
        [["A"], ["A"]],
        [[1], []],
        [["A", 2, "C"], %w[A C]],
      ].each do |values, expected|

        describe "on #{values.inspect}" do

          before do
            @list = Hamster.list(*values)
          end

          it "returns #{expected.inspect}" do
            @list.grep(String).should == Hamster.list(*expected)
          end

        end

      end

    end

    describe "with a block" do

      [
        [[], []],
        [["A"], ["a"]],
        [[1], []],
        [["A", 2, "C"], %w[a c]],
      ].each do |values, expected|

        describe "on #{values.inspect}" do

          before do
            @original = Hamster.list(*values)
            @result = @original.grep(String, &:downcase)
          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

1 entries across 1 versions & 1 rubygems

Version	Path
hamster-1.0.1.pre.rc.1	spec/hamster/list/grep_spec.rb