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A unit test that increases coverage from 77 percent to 98 percent. The
remaining uncovered lines of code are difficult to exercise.

While writing this unit test, we discovered that ExtentClipping
was not implemented. This patch repairs that defect.

Code extracted from:

    https://gitlab.kitware.com/third-party/proj.git

at commit 41bdf05361007f8c5186f3df9944d86bb273ed13 (for/vtk).

Change-Id: I10a54acbd076e055d8071414f2fff1ebafe1653d

Add to the Testing/Data directory ExternalData content links mirroring
the content and layout we use from the VTKData/Data directory.

Add a CMake/vtkLegacyData.cmake module, included from CMakeLists.txt and
Testing/External/CMakeLists.txt, to call ExternalData_Expand_Arguments
for all data directories added from VTKData/Data.  This will bulk-fetch
all test input data currently used by tests of any module, enabled or
not.  We can make the DATA{} references more granular later.

Add a VTK_TEST_DATA_DIR variable to refer to the directory we tell the
ExternalData module to populate the real data files.  Replace references
to VTK_DATA_ROOT in test command lines (after -D) with references to
VTK_TEST_DATA_DIR.  Drop the VTK_DATA_ROOT CMake option and stop using
the VTKData repository.

Remove the TESTING_DATA option from the vtk_add_test_cxx API and remove
the VTK_DATA_ROOT option from the vtk_add_test_mpi API since all test
input data are now handled through ExternalData and Testing/Data content
links.

Change-Id: Id02490b76ea2e161b9038188264a4830485039d8

Change-Id: I08fa5337157eda3867866956833ff80445ab70b5

Baseline images are now referenced by ExternalData content links stored
directly in each module source tree.  Drop the old VTKData baseline
subdirectory name from the vtk_add_test_* signatures.

Change-Id: I5bdc7a5bf87fc7c8fa77dcd50b79f2f54d6eba31

Tell calls to vtk_add_test_(cxx|python|tcl) explicitly when there is no
valid baseline image to avoid passing -V unnecessarily.

Change-Id: Ibe5aecdfa076446ddda0b95e814483eb6622af73

Use vtk_add_test_cxx and vtk_test_cxx_executable to replace calls to
vtk_tests.  Then remove vtk_tests and parse_optional_arguments.

Change-Id: I73dee627fa87a399c48b409af046b116fc75a0fd

The vtkTestingInteractor was trying to run regression tests even if
VTK_DATA_ROOT was not defined.

Many Testing/Cxx CMakeLists.txt files tried to run tests that required
input data, even though VTK_DATA_ROOT was not defined.

Subsequent topics will address Tcl and Python tests.

Change-Id: Iabf242f9f498ce044948ca1d4a29378b76ceb21d

Change-Id: Id024c377b6b85f3f9ca794984f7200362e6a565c

We don't plan to move the vtk baseline images so this new testing
macro needs an argument to tell it where to find the images to
compare with.

Change-Id: Iab3f617b07d80ea5fba18333a8c9afc83cb3ca16

The test run by fail. Need to fix these at some later point in time.

Change-Id: Ifa956c9c4410c410a9accb96877fe57c86693c66