require 'test/unit'
require 'pstore'

class PStoreTest < Test::Unit::TestCase
  def setup
    @pstore_file = "pstore.tmp.#{Process.pid}"
    @pstore = PStore.new(@pstore_file)
  end

  def teardown
    File.unlink(@pstore_file) rescue nil
  end

  def test_opening_new_file_in_readonly_mode_should_result_in_empty_values
    @pstore.transaction(true) do
      assert_nil @pstore[:foo]
      assert_nil @pstore[:bar]
    end
  end
  
  def test_opening_new_file_in_readwrite_mode_should_result_in_empty_values
    @pstore.transaction do
      assert_nil @pstore[:foo]
      assert_nil @pstore[:bar]
    end
  end
  
  def test_data_should_be_loaded_correctly_when_in_readonly_mode
    @pstore.transaction do
      @pstore[:foo] = "bar"
    end
    @pstore.transaction(true) do
      assert_equal "bar", @pstore[:foo]
    end
  end
  
  def test_data_should_be_loaded_correctly_when_in_readwrite_mode
    @pstore.transaction do
      @pstore[:foo] = "bar"
    end
    @pstore.transaction do
      assert_equal "bar", @pstore[:foo]
    end
  end
  
  def test_changes_after_commit_are_discarded
    @pstore.transaction do
      @pstore[:foo] = "bar"
      @pstore.commit
      @pstore[:foo] = "baz"
    end
    @pstore.transaction(true) do
      assert_equal "bar", @pstore[:foo]
    end
  end
  
  def test_changes_are_not_written_on_abort
    @pstore.transaction do
      @pstore[:foo] = "bar"
      @pstore.abort
    end
    @pstore.transaction(true) do
      assert_nil @pstore[:foo]
    end
  end
  
  def test_writing_inside_readonly_transaction_raises_error
    assert_raise(PStore::Error) do
      @pstore.transaction(true) do
        @pstore[:foo] = "bar"
      end
    end
  end
end