fix: finalize recordings before automatic replay

tests/unit/utils/test_media.py

@@ -0,0 +1,42 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import json
+
+from artemis.utils.media import (
+    create_steps_json_from_trace_folder,
+    remove_steps_json_from_trace_folder,
+)
+
+
+def test_step_compilation_preserves_recording_manifest(tmp_path):
+    step_file = tmp_path / "123.json"
+    step_file.write_text('{"action": "click"}', encoding="utf-8")
+    recording_manifest = tmp_path / "recording.json"
+    recording_manifest.write_text(
+        '{"version": 1, "segments": [{"file": "recording.mp4"}]}',
+        encoding="utf-8",
+    )
+
+    create_steps_json_from_trace_folder(tmp_path)
+
+    compiled = json.loads((tmp_path / "steps.json").read_text(encoding="utf-8"))
+    assert compiled == [{"timestamp": 123, "data": '{"action": "click"}'}]
+    assert recording_manifest.exists()
+
+    remove_steps_json_from_trace_folder(tmp_path)
+
+    assert not step_file.exists()
+    assert recording_manifest.exists()
+    assert (tmp_path / "steps.json").exists()