Tests: Alembic: Add coverage for point cloud attribute import validation

Adds coverage for recently added import of pointcloud attributes.
See PR blender/blender!145946

Pull Request: https://projects.blender.org/blender/blender/pulls/147494

tests/files/alembic/compare/reference/point_attributes.txt

@@ -0,0 +1,39 @@
+==== Point Clouds: 1
+- PointCloud 'particles' points:5
+  - attr 'emission' FLOAT_COLOR POINT
+    - (3.261, 0.846, 0.097, 1.000)
+    - (3.188, 0.827, 0.094, 1.000)
+    - (3.660, 0.949, 0.108, 1.000)
+    - (3.597, 0.933, 0.107, 1.000)
+    - (3.205, 0.831, 0.095, 1.000)
+  - attr 'normals' FLOAT_VECTOR POINT
+    - (-0.467, 0.698, 0.544)
+    - (-0.708, 0.276, -0.650)
+    - (0.652, -0.041, -0.757)
+    - (0.672, -0.274, 0.688)
+    - (-0.705, -0.664, 0.249)
+  - attr 'position' FLOAT_VECTOR POINT
+    - (-2.168, 0.698, -0.916)
+    - (1.324, 0.276, -2.865)
+    - (3.020, -0.041, 1.284)
+    - (-1.478, -0.274, 2.791)
+    - (-1.483, -0.664, -1.957)
+  - attr 'radius' FLOAT POINT
+    - 0.577 0.577 0.577 0.577 0.577 
+  - attr 'temperature' FLOAT POINT
+    - 0.400 0.400 0.400 0.400 0.400 
+  - attr 'uv' FLOAT2 POINT
+    - (0.863, 0.746)
+    - (0.118, 0.589)
+    - (0.363, 0.487)
+    - (0.627, 0.412)
+    - (0.946, 0.269)
+
+==== Objects: 1
+- Obj 'particles' POINTCLOUD data:'particles'
+  - pos 0.000, 0.000, 0.000
+  - rot 0.000, 0.000, 0.000 (XYZ)
+  - scl 1.000, 1.000, 1.000
+  - 1 modifiers
+    - MESH_SEQUENCE_CACHE 'MeshSequenceCache'
+

tests/python/CMakeLists.txt

@@ -1177,6 +1177,7 @@ if(WITH_ALEMBIC AND TEST_SRC_DIR_EXISTS)
     --python ${CMAKE_CURRENT_LIST_DIR}/bl_alembic_io_test.py
     --
     --testdir "${TEST_SRC_DIR}/alembic"
+    --outdir "${TEST_OUT_DIR}/io_alembic"
   )
 endif()
 

tests/python/bl_alembic_io_test.py

@@ -14,6 +14,8 @@ import unittest
 
 import bpy
 
+sys.path.append(str(pathlib.Path(__file__).parent.absolute()))
+
 args = None
 
 
@@ -449,6 +451,40 @@ class OverrideLayersTest(AbstractAlembicTest):
         self.assertEqual(len(mesh.polygons), 6)
 
 
+class AlembicImportComparisonTests(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls):
+        cls.testdir = args.testdir
+        cls.output_dir = args.outdir
+
+    def test_import_alembic(self):
+        comparisondir = self.testdir.joinpath("compare")
+        input_files = sorted(pathlib.Path(comparisondir).glob("*.abc"))
+        self.passed_tests = []
+        self.failed_tests = []
+        self.updated_tests = []
+
+        from modules import io_report
+        report = io_report.Report("Alembic Import", self.output_dir, comparisondir, comparisondir.joinpath("reference"))
+        io_report.Report.context_lines = 8
+
+        for input_file in input_files:
+            input_file_path = pathlib.Path(input_file)
+
+            io_report.Report.side_to_print_single_line = 5
+            io_report.Report.side_to_print_multi_line = 3
+
+            with self.subTest(input_file_path.stem):
+                bpy.ops.wm.open_mainfile(filepath=str(self.testdir / "empty.blend"))
+                ok = report.import_and_check(
+                    input_file, lambda filepath, params: bpy.ops.wm.alembic_import(
+                        filepath=str(input_file), **params))
+                if not ok:
+                    self.fail(f"{input_file.stem} import result does not match expectations")
+
+        report.finish("io_alembic_import")
+
+
 def main():
     global args
     import argparse
@@ -460,6 +496,7 @@ def main():
 
     parser = argparse.ArgumentParser()
     parser.add_argument('--testdir', required=True, type=pathlib.Path)
+    parser.add_argument('--outdir', required=True, type=pathlib.Path)
     args, remaining = parser.parse_known_args(argv)
 
     unittest.main(argv=remaining)