[PROJ] PROJ 6 testntv2 fails

[Markus Metz]

On Wed, Mar 6, 2019 at 6:57 PM Greg Troxel <gdt at lexort.com> wrote:
>
> Given that the grid files are intended to get better results, it would
> be really nice if the tests passed with them, either via fuzz (which
> makes sense if both answers are correct) or via having two recorded
> acceptable values.

I guess the tests are designed to test the numerical stability of the proj
code, for given input data. Therefore it does not matter how accurate the
input data are, what matters is that for the expected input data the
expected result must be provided. If the input data are not as expected,
the test fails, obviously.

The output line
-->
Try with NTv2 and NTv1 together ... falls back to NTv1
<--
looks suspicious, also causing the test failure.

README:
"The test suite requires that the proj-datumgrid package is installed
in `PROJ_LIB`."

This should be expanded to note which datumgrid packages should *not* be
installed for the tests, or that only the package proj-datumgrid-<X>.<Y>
should be installed, but no other datumgrid packages.

Markus M
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