[ET Trac] [Einstein Toolkit] #1599: CarpetInterp/waveinterp_2p tests constant in space initial data

[Einstein Toolkit]

#1599: CarpetInterp/waveinterp_2p tests constant in space initial data
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  Reporter:  rhaas   |       Owner:  eschnett           
      Type:  defect  |      Status:  new                
  Priority:  minor   |   Milestone:                     
 Component:  Carpet  |     Version:  development version
Resolution:          |    Keywords:  CarpetInterp       
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Comment (by rhaas):

 As far as I can tell relative error checks are not disabled in test.ccl.
 It only specifies the number of processes to use for each test. I can add
 a
 {{{
 RELTOL 1e42
 }}}
 to the test to avoid relative differences.

 I agree that testing the 2nd time derivative is important.

 Would a non-zero 2nd time derivative and not-constant in space data test
 more of the code? Testing an interpolator with constant (or very low order
 data) seems not like the best idea. The prolongation tests eg use
 operators that are as high order as possible while still allowing exact
 recovery of the result (ie 3rd order polynomial test function for the 3rd
 order prolongation operators).

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1599#comment:3>
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