Updated and extended Regression Testing frameworks (Gsoc 2020)

This revision contains the following changes-

  - Updated the existing testing framework for Modifiers for Regression
  Testing.
  - Tests for Physics modifiers and remaining Generate and Deform modifiers are added.
  - The existing `ModifierSpec` is updated with backward compatibility to support Physics Modifiers.
  - Now there is support for frame number and giving nested parameters for attributes.
  - Some Deform modifiers required Object Operators, e.g. "Bind" in Mesh Deform, so a new class was added to support that functionality.
  - A separate class for holding Particles System, they are tested by converting all the particles to mesh and joining it to the mesh they were added.
  - Updated the format to add tests for Bevel, Boolean and Operators as
  well.

Reviewed By: zazizizou, mont29, campbellbarton

Differential Revision: https://developer.blender.org/D8507

tests/python/physics_particle_instance.py

@@ -0,0 +1,56 @@
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+# <pep8 compliant>
+
+import os
+import sys
+
+import bpy
+
+sys.path.append(os.path.dirname(os.path.realpath(__file__)))
+from modules.mesh_test import RunTest, ModifierSpec, MeshTest
+
+
+def main():
+    test = [
+
+        MeshTest("ParticleInstanceSimple", "testParticleInstance", "expectedParticleInstance",
+                 [ModifierSpec('ParticleInstance', 'PARTICLE_INSTANCE', {'object': bpy.data.objects['Cube']})],
+                 threshold=1e-3),
+
+    ]
+    particle_instance_test = RunTest(test)
+
+    command = list(sys.argv)
+    for i, cmd in enumerate(command):
+        if cmd == "--run-all-tests":
+            particle_instance_test.apply_modifiers = True
+            particle_instance_test.do_compare = True
+            particle_instance_test.run_all_tests()
+            break
+        elif cmd == "--run-test":
+            particle_instance_test.apply_modifiers = False
+            particle_instance_test.do_compare = False
+            name = command[i + 1]
+            particle_instance_test.run_test(name)
+            break
+
+
+if __name__ == "__main__":
+    main()