Build and atomically write .dbz documents

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>

1 files changed, 79 insertions, 0 deletions

diff --git a/tests/test_dbz.py b/tests/test_dbz.py
new file mode 100644
index 0000000..7bcf69a
--- /dev/null
+++ b/tests/test_dbz.py
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+# generat3D - evaluate Daz DSON scenes and write .dbz files
+# Copyright (C) 2026 Danilo M. <danix@danix.xyz>
+#
+# 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.
+
+import contextlib
+import gzip
+import io
+import json
+import math
+import tempfile
+import unittest
+from pathlib import Path
+
+from generat3d.dbz import build, orientation_quat, write
+from generat3d.library import Library
+from generat3d.scene import load
+
+DATA = Path(__file__).parent / "data"
+
+
+class DbzTest(unittest.TestCase):
+    def setUp(self):
+        with contextlib.redirect_stderr(io.StringIO()):
+            self.doc = build(load(DATA / "scene.duf", Library([DATA / "lib"])), [DATA / "lib"])
+
+    def test_header(self):
+        self.assertEqual(self.doc["application"], "export_to_blender")
+        self.assertEqual(self.doc["figures"][-1], {"name": "dummy", "num verts": 0})
+
+    def test_figure_entry(self):
+        fig = self.doc["figures"][0]
+        self.assertEqual((fig["name"], fig["id"], fig["label"], fig["class"]),
+                         ("Fig", "Fig", "Test Figure", "DzFigure"))
+        self.assertEqual(fig["num verts"], 3)
+        self.assertEqual(fig["vertices"][1], [1.5, 2.0, 0.0])
+        self.assertEqual(fig["material groups"], ["Skin"])
+        self.assertEqual(fig["orientation"], [0.0, 0.0, 0.0, 1.0])
+        self.assertNotIn("ws_transform", fig)
+
+    def test_bones(self):
+        hip = self.doc["figures"][0]["bones"][0]
+        self.assertEqual(hip["name"], "hip")
+        self.assertEqual(hip["center_point"], [0, 7, 0])
+        self.assertEqual(hip["origin"], [0, 7, 0])
+        self.assertEqual(hip["rotation_order"], "YZX")
+
+    def test_orientation_quat(self):
+        x, y, z, w = orientation_quat([90, 0, 0])
+        self.assertAlmostEqual(x, math.sqrt(0.5))
+        self.assertAlmostEqual(w, math.sqrt(0.5))
+        self.assertAlmostEqual(y, 0)
+        self.assertAlmostEqual(z, 0)
+
+    def test_write_is_gzip_json_and_atomic(self):
+        with tempfile.TemporaryDirectory() as d:
+            out = Path(d) / "s.dbz"
+            write(self.doc, out)
+            self.assertEqual(json.loads(gzip.decompress(out.read_bytes())), self.doc)
+            self.assertEqual([p.name for p in Path(d).iterdir()], ["s.dbz"])
+
+    def test_failed_write_leaves_nothing(self):
+        with tempfile.TemporaryDirectory() as d:
+            out = Path(d) / "s.dbz"
+            with self.assertRaises(TypeError):
+                write({"bad": object()}, out)
+            self.assertEqual(list(Path(d).iterdir()), [])