require 'test/unit'
require 'yaml/store'
Syck::Store = YAML::Store unless defined?(Syck::Store)

module Syck
  class YAMLStoreTest < Test::Unit::TestCase
    def setup
      @engine, YAML::ENGINE.yamler = YAML::ENGINE.yamler, 'syck'
      @yamlstore_file = "yamlstore.tmp.#{Process.pid}"
      @yamlstore = YAML::Store.new(@yamlstore_file)
    end

    def teardown
      YAML::ENGINE.yamler = @engine
      File.unlink(@yamlstore_file) rescue nil
    end

    def test_opening_new_file_in_readonly_mode_should_result_in_empty_values
      @yamlstore.transaction(true) do
        assert_nil @yamlstore[:foo]
        assert_nil @yamlstore[:bar]
      end
    end

    def test_opening_new_file_in_readwrite_mode_should_result_in_empty_values
      @yamlstore.transaction do
        assert_nil @yamlstore[:foo]
        assert_nil @yamlstore[:bar]
      end
    end

    def test_data_should_be_loaded_correctly_when_in_readonly_mode
      @yamlstore.transaction do
        @yamlstore[:foo] = "bar"
      end
      @yamlstore.transaction(true) do
        assert_equal "bar", @yamlstore[:foo]
      end
    end

    def test_data_should_be_loaded_correctly_when_in_readwrite_mode
      @yamlstore.transaction do
        @yamlstore[:foo] = "bar"
      end
      @yamlstore.transaction do
        assert_equal "bar", @yamlstore[:foo]
      end
    end

    def test_changes_after_commit_are_discarded
      @yamlstore.transaction do
        @yamlstore[:foo] = "bar"
        @yamlstore.commit
        @yamlstore[:foo] = "baz"
      end
      @yamlstore.transaction(true) do
        assert_equal "bar", @yamlstore[:foo]
      end
    end

    def test_changes_are_not_written_on_abort
      @yamlstore.transaction do
        @yamlstore[:foo] = "bar"
        @yamlstore.abort
      end
      @yamlstore.transaction(true) do
        assert_nil @yamlstore[:foo]
      end
    end

    def test_writing_inside_readonly_transaction_raises_error
      assert_raise(PStore::Error) do
        @yamlstore.transaction(true) do
          @yamlstore[:foo] = "bar"
        end
      end
    end
  end
end
