new_contents: import pytest
  import gaarf.io.reader as reader
  
  
  def test_console_reader():
      console_reader = reader.ConsoleReader()
      expected = "SELECT 1"
      assert expected == console_reader.read(expected)
  
  
  @pytest.fixture
  def reader_factory():
      return reader.ReaderFactory()
  
  
  def test_reader_factory_load(reader_factory):
      assert reader_factory.reader_options == {
          "file": reader.FileReader,
          "console": reader.ConsoleReader
      }
  
  
  def test_reader_factory_inits(reader_factory):
      file_reader = reader_factory.create_reader("file")
      console_reader = reader_factory.create_reader("console")
      assert isinstance(file_reader, reader.FileReader)
      assert isinstance(console_reader, reader.ConsoleReader)
  
  
  def test_null_reader_raises_unknown_reader_error(reader_factory):
      with pytest.raises(ValueError):
          reader_factory.create_reader("non-existing-option")
  
subject: Add tests for reader