Tests: exclude big-endian tests on macOS

In preparation for adding big-endian tests, disable them on macOS
where many are failing, although it looks like the cause of failure
may not relate to endian conversion, it needs further investigation.

tests/python/bl_blendfile_versioning.py

@@ -3,10 +3,12 @@
 # SPDX-License-Identifier: Apache-2.0
 
 # ./blender.bin --background --python tests/python/bl_blendfile_versioning.py ..
-import bpy
 import os
+import platform
 import sys
 
+import bpy
+
 sys.path.append(os.path.dirname(os.path.realpath(__file__)))
 from bl_blendfile_utils import TestHelper
 
@@ -43,6 +45,21 @@ class TestBlendFileOpenAllTestFiles(TestHelper):
             "ram_glsl.blend",
         }
 
+        # Directories to exclude relative to `./tests/data/`.
+        self.excluded_dirs = ()
+
+        if platform.system() == "Darwin":
+            self.excluded_dirs = (
+                *self.excluded_dirs,
+                # The assert in `BKE_libblock_alloc_in_lib` often fails:
+                # `BLI_assert(bmain->is_locked_for_linking == false || ELEM(type, ID_WS, ID_GR, ID_NT))`.
+                # This needs to be investigated.
+                "io_tests/blend_big_endian/",
+            )
+
+        assert all(p.endswith("/") for p in self.excluded_dirs)
+        self.excluded_dirs = tuple(p.replace("/", os.sep) for p in self.excluded_dirs)
+
         # Generate the slice of blendfile paths that this instance of the test should process.
         blendfile_paths = [p for p in self.iter_blendfiles_from_directory(self.args.src_test_dir)]
         # `os.scandir()` used by `iter_blendfiles_from_directory` does not
@@ -73,16 +90,26 @@ class TestBlendFileOpenAllTestFiles(TestHelper):
         slice_indices = [(gen_indices(i), gen_indices(i + 1)) for i in range(slice_range)]
         return slice_indices[slice_index]
 
+    def skip_path_check(self, bfp):
+        if os.path.basename(bfp) in self.excluded_paths:
+            return True
+        if self.excluded_dirs:
+            assert bfp.startswith(self.args.src_test_dir)
+            bfp_relative = bfp[len(self.args.src_test_dir):].rstrip(os.sep)
+            if bfp_relative.startswith(*self.excluded_dirs):
+                return True
+        return False
+
     def test_open(self):
         for bfp in self.blendfile_paths:
-            if os.path.basename(bfp) in self.excluded_paths:
+            if self.skip_path_check(bfp):
                 continue
             bpy.ops.wm.read_homefile(use_empty=True, use_factory_startup=True)
             bpy.ops.wm.open_mainfile(filepath=bfp, load_ui=False)
 
     def link_append(self, do_link):
         for bfp in self.blendfile_paths:
-            if os.path.basename(bfp) in self.excluded_paths:
+            if self.skip_path_check(bfp):
                 continue
             bpy.ops.wm.read_homefile(use_empty=True, use_factory_startup=True)
             with bpy.data.libraries.load(bfp, link=do_link) as (lib_in, lib_out):