Improve randomisation of answers

test_amateurfunk_anki.py

@@ -127,6 +127,19 @@ class TestResolveShuffleSeed(unittest.TestCase):
         self.assertNotEqual(first, second)
 
 
+class TestBuildEpochForRebuild(unittest.TestCase):
+    """Multiple-choice rebuilds must look newer to Anki by default."""
+
+    def test_default_uses_current_time(self):
+        with patch("amateurfunk_anki.time.time", return_value=1777777777.9):
+            self.assertEqual(aa.build_epoch_for_rebuild(), 1777777777)
+
+    def test_explicit_epoch_is_preserved_for_reproducible_builds(self):
+        with patch("amateurfunk_anki.time.time") as current_time:
+            self.assertEqual(aa.build_epoch_for_rebuild(1234567890), 1234567890)
+        current_time.assert_not_called()
+
+
 class TestAnkiBuild(unittest.TestCase):
     def setUp(self):
         self.tmp = tempfile.TemporaryDirectory()
@@ -662,6 +675,42 @@ class TestAnkiBuild(unittest.TestCase):
         ]
         self.assertFalse(all(byte_equal))
 
+    def test_cli_default_rebuild_stamps_notes_as_newer(self):
+        out_a = self.root / "anki-current-a"
+        out_b = self.root / "anki-current-b"
+        common = [
+            "--data", str(self.data_dir),
+            "--explanations", str(self.explanations_path),
+        ]
+
+        with (
+            patch(
+                "amateurfunk_anki.resolve_shuffle_seed",
+                side_effect=["fresh-a", "fresh-b"],
+            ),
+            patch(
+                "amateurfunk_anki.time.time",
+                side_effect=[1777777777.9, 1777777788.1],
+            ),
+        ):
+            aa.main([*common, "--out", str(out_a)])
+            aa.main([*common, "--out", str(out_b)])
+
+        def note_mods(out_dir):
+            apkg = out_dir / "amateurfunk-technische-kenntnisse-n.apkg"
+            with tempfile.TemporaryDirectory() as tmp:
+                db_path, _media, _names = extract_collection(apkg, Path(tmp))
+                conn = sqlite3.connect(db_path)
+                try:
+                    return {
+                        row[0] for row in conn.execute("select mod from notes")
+                    }
+                finally:
+                    conn.close()
+
+        self.assertEqual(note_mods(out_a), {1777777777})
+        self.assertEqual(note_mods(out_b), {1777777788})
+
 
 class TestIntrinsicSvgSize(unittest.TestCase):
     """Parsing of native figure dimensions — SVG only."""