1 files changed, 52 insertions, 0 deletions
diff --git a/tests/python/bl_alembic_io_test.py b/tests/python/bl_alembic_io_test.py
index c0d0bcdea70..da75d4f0731 100644
--- a/tests/python/bl_alembic_io_test.py
+++ b/tests/python/bl_alembic_io_test.py
@@ -357,6 +357,58 @@ class CameraExportImportTest(unittest.TestCase):
         self.assertAlmostEqual(1, actual_scale.z, delta=delta_scale)
 
 
+class OverrideLayersTest(AbstractAlembicTest):
+    def test_import_layer(self):
+        fname = 'cube-base-file.abc'
+        fname_layer = 'cube-hi-res.abc'
+        abc = self.testdir / fname
+        abc_layer = self.testdir / fname_layer
+
+        # We need a cache reader to ensure that the data will be updated after adding a layer.
+        res = bpy.ops.wm.alembic_import(filepath=str(abc), as_background_job=False, always_add_cache_reader=True)
+        self.assertEqual({'FINISHED'}, res)
+
+        # Check that the file loaded ok.
+        cube = bpy.context.active_object
+        depsgraph = bpy.context.evaluated_depsgraph_get()
+        scene = bpy.context.scene
+        cube_eval = cube.evaluated_get(depsgraph)
+        mesh = cube_eval.to_mesh()
+
+        # The base file should be a default cube.
+        self.assertEqual(len(mesh.vertices), 8)
+        self.assertEqual(len(mesh.edges), 12)
+        self.assertEqual(len(mesh.polygons), 6)
+
+        # Add a layer.
+        cache_file = bpy.data.cache_files[fname]
+        self.assertEqual(len(cache_file.layers), 0)
+
+        layer = cache_file.layers.new(filepath=str(abc_layer))
+        self.assertEqual(len(cache_file.layers), 1)
+        self.assertIsNotNone(layer)
+
+        # The layer added a higher res version of the mesh.
+        depsgraph = bpy.context.evaluated_depsgraph_get()
+        cube_eval = cube.evaluated_get(depsgraph)
+        mesh = cube_eval.to_mesh()
+        self.assertEqual(len(mesh.vertices), 26)
+        self.assertEqual(len(mesh.edges), 48)
+        self.assertEqual(len(mesh.polygons), 24)
+
+        # Remove the layer.
+        cache_file.layers.remove(layer)
+        self.assertEqual(len(cache_file.layers), 0)
+
+        # We should have reverted to the default cube.
+        depsgraph = bpy.context.evaluated_depsgraph_get()
+        cube_eval = cube.evaluated_get(depsgraph)
+        mesh = cube_eval.to_mesh()
+        self.assertEqual(len(mesh.vertices), 8)
+        self.assertEqual(len(mesh.edges), 12)
+        self.assertEqual(len(mesh.polygons), 6)
+
+
 def main():
     global args
     import argparse