diff --git a/tests/cli_commands/test_project_registry.py b/tests/cli_commands/test_project_registry.py
index 1a2e79b76c..6bd00f3792 100644
--- a/tests/cli_commands/test_project_registry.py
+++ b/tests/cli_commands/test_project_registry.py
@@ -470,6 +470,7 @@ def register(knowledge_root: Path) -> tuple[str, Path]:
     r'Inspect C:\tools\new and "quoted text".',
     "Compare --- in prose & preserve <tags>.",
     "Example\u2028## Agent Todo\u2029- [ ] Example only.",
+    "比较中文输入并保留 café 与 🧪。",
 ])
 def test_project_register_repeated_identical_request_is_a_noop(
     tmp_path: Path,
@@ -544,25 +545,25 @@ def test_project_register_repeated_identical_request_is_a_noop(
 
     # A completed creation receipt does not roll later presentation back to the
     # initial template, including updated metadata or owner-written narrative.
-    text = state_file.read_text()
+    text = state_file.read_text(encoding="utf-8")
     header, body = text.split("\n---\n", 1)
     header = "\n".join(
         "objective: " + json.dumps(objective, ensure_ascii=True)
         if line.startswith("objective: ") else line for line in header.split("\n")
     )
     equivalent = header + "\n---\n" + body
-    state_file.write_text(equivalent)
+    state_file.write_text(equivalent, encoding="utf-8")
     assert main(arguments) == 0
     capsys.readouterr()
-    assert state_file.read_text() == equivalent
+    assert state_file.read_text(encoding="utf-8") == equivalent
     for drifted in (equivalent.replace("status: active", "status: paused", 1),
                     equivalent.replace("A verified Spec diff is produced.", "Different acceptance.", 1)):
-        state_file.write_text(drifted)
+        state_file.write_text(drifted, encoding="utf-8")
         assert main(arguments) == 0
         replay = json.loads(capsys.readouterr().out)
         assert replay["changed"] is False
         assert replay["storage_selection"]["status"] == "replayed"
-        assert state_file.read_text() == drifted
+        assert state_file.read_text(encoding="utf-8") == drifted
         assert registry_path.read_bytes() == registry_before