[ET Trac] [Einstein Toolkit] #449: Check for periodicity of initial data with Periodic thorn

[Einstein Toolkit]

#449: Check for periodicity of initial data with Periodic thorn
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  Reporter:  hinder       |       Owner:          
      Type:  enhancement  |      Status:  new     
  Priority:  minor        |   Milestone:          
 Component:  Other        |     Version:          
Resolution:               |    Keywords:  Periodic
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Comment (by eschnett):

 All thorns are supposed to fill in all grid points. If necessary, the
 thorns have to synchronise and apply a boundary condition.

 A generic mechanism for testing this would be to have an independent thorn
 that takes a grid function where supposedly all grid points are valid,
 makes a copy, applies a symmetry boundary condition to the original, and
 then compares to the copy. Any difference is an error. This would also
 test synchronisation and boundary conditions.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/449#comment:2>
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