text: """Tests `text_data.core`."""
  from unittest import mock
  
  import pytest
  
  from text_data.core import requires_display_extra
  
  
  def test_require_decorator():
      """Makes sure that the decorator that requires altair works."""
  
      def fake_function(x, **kwargs):
          return sum(kwargs.values()) + x
  
      with mock.patch.dict("sys.modules", {"altair": None}):
          with pytest.raises(ImportError):
              requires_display_extra(fake_function)(1, y=2, z=3)
  
      try:
          requires_display_extra(fake_function)(1, y=2, z=3)
      except ImportError:
          pytest.fail("This function should not raise an error")
  