diff --git a/api/tests/unit/test_emulator.py b/api/tests/unit/test_emulator.py
index c06e839..26e454a 100644
--- a/api/tests/unit/test_emulator.py
+++ b/api/tests/unit/test_emulator.py
@@ -111,8 +111,10 @@ class TestRealFixtures:
 class TestFixtureLookup:
     def test_exact_beats_prefix(self, tmp_path: Path) -> None:
         hf = _hotfolder(tmp_path)
-        fixtures = _fixtures_dir(tmp_path, {"a.json": {"file_uid": "x", "v": "exact"}, "a0.json": {"v": "prefix"}})
-        job_id = _drop(hf, "a.pdf")
+        # `a_b-1.json` по алфавиту раньше `a_b.json` ('-' 0x2D < '.' 0x2E): без шага «точное имя» победил бы префикс
+        assert sorted(["a_b.json", "a_b-1.json"])[0] == "a_b-1.json"
+        fixtures = _fixtures_dir(tmp_path, {"a_b-1.json": {"v": "prefix"}, "a_b.json": {"file_uid": "x", "v": "exact"}})
+        job_id = _drop(hf, "a_b.pdf")
         process_once(hf.root, fixtures, 0)
         assert _answer(hf, job_id) == {"file_uid": job_id, "v": "exact"}
 
@@ -120,7 +122,6 @@ class TestFixtureLookup:
         hf = _hotfolder(tmp_path)
         fixtures = _fixtures_dir(tmp_path, {"a_zz.json": {"v": "zz"}, "a_b.json": {"v": "b"}, "a_c.json": {"v": "c"}})
         job_id = _drop(hf, "a.pdf")
-        # `a_*` не совпадает с префиксом `a` по имени без расширения? совпадает: `a*.json`
         process_once(hf.root, fixtures, 0)
         assert _answer(hf, job_id)["v"] == "b"