Tests: add physics tests cloth and softybody

This uses the same framework as automated modifier tests. It adds a physics
modifier, bakes and compares vertex coordinates on the end frame.

Differential Revision: https://developer.blender.org/D7017

tests/python/physics_cloth.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 ModifierTest, PhysicsSpec
+
+
+def main():
+    test = [
+        ["testCloth", "expectedCloth",
+         [PhysicsSpec('Cloth', 'CLOTH', {'quality': 5}, 35)]],
+    ]
+    cloth_test = ModifierTest(test, threshold=1e-3)
+
+    command = list(sys.argv)
+    for i, cmd in enumerate(command):
+        if cmd == "--run-all-tests":
+            cloth_test.apply_modifiers = True
+            cloth_test.run_all_tests()
+            break
+        elif cmd == "--run-test":
+            cloth_test.apply_modifiers = False
+            index = int(command[i + 1])
+            cloth_test.run_test(index)
+            break
+
+
+if __name__ == "__main__":
+    try:
+        main()
+    except:
+        import traceback
+        traceback.print_exc()
+        sys.exit(1)