code: def add_namespace(self, namespace):
          
  
          if namespace is None:
              raise ValueError("Namespace argument must not be None")
  
          # Normalize the namespace name
          namespace = namespace.strip('/')
  
          if namespace in self.namespaces:
              raise CIMError(
                  CIM_ERR_ALREADY_EXISTS,
                  _format("Namespace {0!A} already exists in the mock "
                          "repository", namespace))
  
          self.namespaces[namespace] = True
docs: Add a CIM namespace to the mock repository.
  
          The namespace must not yet exist in the mock repository.
  
          Note that the default connection namespace is automatically added to
          the mock repository upon creation of this object.
  
          Parameters:
  
            namespace (:term:`string`):
              The name of the CIM namespace in the mock repository. Must not be
              `None`. Any leading and trailing slash characters are split off
              from the provided string.
  
          Raises:
  
            ValueError: Namespace argument must not be None
            CIMError: CIM_ERR_ALREADY_EXISTS if the namespace already exists in
              the mock repository.