old_contents: """A module containing tests for the library representation of IATI constants."""
  import iati.core.constants
  
  
  class TestConstants(object):
      """A container for tests relating to IATI software constants"""
  
      def test_namespace(self):
          """Check that the NAMESPACE constant is a string."""
          assert isinstance(iati.core.constants.NAMESPACE, str)
  
      def test_nsmap(self):
          """Check that the NSMAP constant is a dictionary with the correct key."""
          assert isinstance(iati.core.constants.NSMAP, dict)
          assert isinstance(iati.core.constants.NSMAP['xsd'], str)
  
new_contents: """A module containing tests for the library representation of IATI constants."""
  import iati.core.constants
  
  
  class TestConstants(object):
      """A container for tests relating to IATI software constants."""
  
      def test_namespace(self):
          """Check that the NAMESPACE constant is a string."""
          assert isinstance(iati.core.constants.NAMESPACE, str)
  
      def test_nsmap(self):
          """Check that the NSMAP constant is a dictionary with the correct key."""
          assert isinstance(iati.core.constants.NSMAP, dict)
          assert isinstance(iati.core.constants.NSMAP['xsd'], str)
  
subject: Fix lintin error