Add initial, very basic save/open & library linking blendfile tests.

Do not do much for now, but would have been enough to catch the crash
introduced the other day in linking code...

tests/python/CMakeLists.txt

@@ -127,6 +127,20 @@ add_blender_test(
   --python ${CMAKE_CURRENT_LIST_DIR}/bl_id_management.py
 )
 
+# ------------------------------------------------------------------------------
+# BLEND IO & LINKING
+
+add_blender_test(
+  blendfile_io
+  --python ${CMAKE_CURRENT_LIST_DIR}/bl_blendfile_io.py --
+  --output-dir ${TEST_OUT_DIR}/blendfile_io/
+)
+
+add_blender_test(
+  blendfile_liblink
+  --python ${CMAKE_CURRENT_LIST_DIR}/bl_blendfile_liblink.py
+)
+
 # ------------------------------------------------------------------------------
 # MODELING TESTS
 add_blender_test(

tests/python/bl_blendfile_io.py

@@ -0,0 +1,110 @@
+# Apache License, Version 2.0
+
+# ./blender.bin --background -noaudio --python tests/python/bl_blendfile_io.py
+import bpy
+import os
+import pprint
+
+
+class TestHelper:
+
+    @staticmethod
+    def id_to_uid(id_data):
+        return (type(id_data).__name__,
+                id_data.name,
+                id_data.users,
+                id_data.library.filepath if id_data.library else None)
+
+    @classmethod
+    def blender_data_to_tuple(cls, bdata):
+        return sorted(tuple((cls.id_to_uid(k), sorted(tuple(cls.id_to_uid(vv) for vv in v)))
+                            for k, v in bdata.user_map().items()))
+        
+    @staticmethod
+    def ensure_path(path):
+        if not os.path.exists(path):
+            os.makedirs(path)
+
+    def run_all_tests(self):
+        for inst_attr_id in dir(self):
+            if not inst_attr_id.startswith("test_"):
+                continue
+            inst_attr = getattr(self, inst_attr_id)
+            if callable(inst_attr):
+                inst_attr()
+
+
+class TestBlendFileSaveLoadBasic(TestHelper):
+
+    def __init__(self, args):
+        self.args = args
+
+    def test_save_load(self):
+        bpy.ops.wm.read_factory_settings()
+        bpy.data.meshes.new("OrphanedMesh")
+
+        output_dir = self.args.output_dir
+        self.ensure_path(output_dir)
+        output_path = os.path.join(output_dir, "blendfile.blend")
+
+        orig_data = self.blender_data_to_tuple(bpy.data)
+
+        bpy.ops.wm.save_as_mainfile(filepath=output_path, check_existing=False, compress=False)
+        bpy.ops.wm.open_mainfile(filepath=output_path, load_ui=False)
+
+        read_data = self.blender_data_to_tuple(bpy.data)
+        
+        # We have orphaned data, which should be removed by file reading, so there should not be equality here.
+        assert(orig_data != read_data)
+
+        bpy.data.orphans_purge()
+        
+        orig_data = self.blender_data_to_tuple(bpy.data)
+
+        bpy.ops.wm.save_as_mainfile(filepath=output_path, check_existing=False, compress=False)
+        bpy.ops.wm.open_mainfile(filepath=output_path, load_ui=False)
+
+        read_data = self.blender_data_to_tuple(bpy.data)
+        
+        assert(orig_data == read_data)
+
+
+
+TESTS = (
+    TestBlendFileSaveLoadBasic,
+    )
+
+
+def argparse_create():
+    import argparse
+
+    # When --help or no args are given, print this help
+    description = "Test basic IO of blend file."
+    parser = argparse.ArgumentParser(description=description)
+    parser.add_argument(
+        "--output-dir",
+        dest="output_dir",
+        default=".",
+        help="Where to output temp saved blendfiles",
+        required=False,
+    )
+
+    return parser
+
+
+def main():
+    args = argparse_create().parse_args()
+
+    for Test in TESTS:
+        Test(args).run_all_tests()
+
+
+if __name__ == '__main__':
+    import sys
+    sys.argv = [__file__] + (sys.argv[sys.argv.index("--") + 1:] if "--" in sys.argv else [])
+    try:
+        main()
+    except:
+        import traceback
+        traceback.print_exc()
+        sys.exit(1)

tests/python/bl_blendfile_liblink.py

@@ -0,0 +1,108 @@
+# Apache License, Version 2.0
+
+# ./blender.bin --background -noaudio --python tests/python/bl_blendfile_liblink.py
+import bpy
+import os
+import pprint
+
+
+class TestHelper:
+
+    @staticmethod
+    def id_to_uid(id_data):
+        return (type(id_data).__name__,
+                id_data.name,
+                id_data.users,
+                id_data.library.filepath if id_data.library else None)
+
+    @classmethod
+    def blender_data_to_tuple(cls, bdata):
+        return sorted(tuple((cls.id_to_uid(k), sorted(tuple(cls.id_to_uid(vv) for vv in v)))
+                            for k, v in bdata.user_map().items()))
+        
+    @staticmethod
+    def ensure_path(path):
+        if not os.path.exists(path):
+            os.makedirs(path)
+
+    def run_all_tests(self):
+        for inst_attr_id in dir(self):
+            if not inst_attr_id.startswith("test_"):
+                continue
+            inst_attr = getattr(self, inst_attr_id)
+            if callable(inst_attr):
+                inst_attr()
+
+
+class TestBlendLibLinkSaveLoadBasic(TestHelper):
+
+    def __init__(self, args):
+        self.args = args
+
+    def test_link_save_load(self):
+        bpy.ops.wm.read_factory_settings()
+        me = bpy.data.meshes.new("LibMesh")
+        me.use_fake_user = True
+
+        output_dir = self.args.output_dir
+        self.ensure_path(output_dir)
+        output_path = os.path.join(output_dir, "blendlib.blend")
+
+        bpy.ops.wm.save_as_mainfile(filepath=output_path, check_existing=False, compress=False)
+
+        bpy.ops.wm.read_factory_settings()
+        bpy.data.orphans_purge()
+
+        link_dir = os.path.join(output_path, "Mesh")
+        bpy.ops.wm.link(directory=link_dir, filename="LibMesh")
+
+        orig_data = self.blender_data_to_tuple(bpy.data)
+
+        output_path = os.path.join(output_dir, "blendfile.blend")
+        bpy.ops.wm.save_as_mainfile(filepath=output_path, check_existing=False, compress=False)
+        bpy.ops.wm.open_mainfile(filepath=output_path, load_ui=False)
+
+        read_data = self.blender_data_to_tuple(bpy.data)
+        
+        assert(orig_data == read_data)
+
+
+
+TESTS = (
+    TestBlendLibLinkSaveLoadBasic,
+    )
+
+
+def argparse_create():
+    import argparse
+
+    # When --help or no args are given, print this help
+    description = "Test basic IO of blend file."
+    parser = argparse.ArgumentParser(description=description)
+    parser.add_argument(
+        "--output-dir",
+        dest="output_dir",
+        default=".",
+        help="Where to output temp saved blendfiles",
+        required=False,
+    )
+
+    return parser
+
+
+def main():
+    args = argparse_create().parse_args()
+
+    for Test in TESTS:
+        Test(args).run_all_tests()
+
+
+if __name__ == '__main__':
+    import sys
+    sys.argv = [__file__] + (sys.argv[sys.argv.index("--") + 1:] if "--" in sys.argv else [])
+    try:
+        main()
+    except:
+        import traceback
+        traceback.print_exc()
+        sys.exit(1)