.. _config_ref tasks validate tests attribute_test:

``attribute_test``
==================

This test validates a selection of atoms in the system. It checks that the attributes of the selected atoms matches the expected value.


Single-valued attributes:

  * ``name``: User-selected name of this selection test

  * ``selection``: VMD atomselection string defining the selection to be tested

  * ``attribute``: The VMD atom attribute to query

  * ``value``: The expected value for the attribute

  * ``value_count``: The expected number of atoms matching the attribute (will default to 1)



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