Regression Testing: Running tests based on blend files

Runs tests based on blend files with minimum python interaction.
Developed as part of GSoC 2021 - Regression Testing of Geometry Nodes.
Earlier, tests were built from scratch by adding a modifier/operation
from the Python API.
Now, tests can also be created inside blender and are compared using
Python script.

Features: Automatically adding expected object if it doesn't exist.
This patch adds tests for the following Geometry Nodes category:
* Curves
* Geometry
* Mesh
* Points

The implemented UML diagram for refactoring of mesh test framework.
{F10225906}

Technical Changes:
SpecMeshTest: It adds the modifier/operation based on the Spec provided.
BlendFileTest: It applies already existing modifier/operation from the blend file.

Test folders hierarchy with tests. This folder should be extracted to `lib\tests\modeling`
{F10240651}
Note: The `geometry_nodes` folder might lie under another `geometry_nodes` folder while extracting, please double check. Use the inner-most one.
The hierarchy should be:
-`lib\tests\modeling\geometry_nodes\mesh`
-`lib\tests\modeling\geometry_nodes\points`
and so on.

* From `ctest` the tests should be run as `ctest -R geo_node -C [Configuration]` on Windows.
* Each single test can be run with its entire name e..g `ctest -R geo_node_geometry_join_geometry`.(just an example). Run `ctest -N -R geo_node` to see all tests.
* From blender, the tests can be run `blender -b path\to\blend\file --python path\to\geo_node_test.py`

Reviewed By: zazizizou, JacquesLucke

Differential Revision: https://developer.blender.org/D11611

1 files changed, 23 insertions, 0 deletions

diff --git a/tests/python/CMakeLists.txt b/tests/python/CMakeLists.txt
index 92cebb7d274..0f9665f0a95 100644
--- a/tests/python/CMakeLists.txt
+++ b/tests/python/CMakeLists.txt
@@ -740,6 +740,29 @@ if(WITH_COMPOSITOR)
 
 endif()
 
+set(geo_node_tests
+  curves
+  geometry
+  mesh
+  points
+)
+
+foreach(geo_node_test ${geo_node_tests})
+  if(EXISTS "${TEST_SRC_DIR}/modeling/geometry_nodes/${geo_node_test}/")
+    file(GLOB files "${TEST_SRC_DIR}/modeling/geometry_nodes/${geo_node_test}/*.blend")
+    foreach(file ${files})
+      get_filename_component(filename ${file} NAME_WE)
+      add_blender_test(
+        geo_node_${geo_node_test}_test_${filename}
+        ${file}
+        --python ${TEST_PYTHON_DIR}/geo_node_test.py
+      )
+      endforeach()
+  else()
+    MESSAGE(STATUS "No directory named ${TEST_SRC_DIR}/modeling/geometry_nodes/${geo_node_test}/ found, disabling test.")
+  endif()
+endforeach()
+
 if(WITH_OPENGL_DRAW_TESTS)
   if(NOT OPENIMAGEIO_IDIFF)
     MESSAGE(STATUS "Disabling OpenGL draw tests because OIIO idiff does not exist")