diff --git a/pyproject.toml b/pyproject.toml
index c5b7b7b..ed4f8aa 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,6 +36,7 @@ dev = [
     "srt>=3.5.3",
     "webvtt-py>=0.5.1",
     "pre-commit>=4.0.1",
+    "pytest-mock>=3.14.0",
 ]
 ui = [
     "gradio>=5.0.2",
diff --git a/uv.lock b/uv.lock
index 6219969..4094f4c 100644
--- a/uv.lock
+++ b/uv.lock
@@ -299,6 +299,7 @@ dev = [
     { name = "pytest" },
     { name = "pytest-antilru" },
     { name = "pytest-asyncio" },
+    { name = "pytest-mock" },
     { name = "pytest-xdist" },
     { name = "ruff" },
     { name = "srt" },
@@ -359,6 +360,7 @@ requires-dist = [
     { name = "pytest", marker = "extra == 'dev'", specifier = ">=8.3.3" },
     { name = "pytest-antilru", marker = "extra == 'dev'", specifier = ">=2.0.0" },
     { name = "pytest-asyncio", marker = "extra == 'dev'", specifier = ">=0.24.0" },
+    { name = "pytest-mock", marker = "extra == 'dev'", specifier = ">=3.14.0" },
     { name = "pytest-xdist", marker = "extra == 'dev'", specifier = ">=3.6.1" },
     { name = "python-multipart", specifier = ">=0.0.10" },
     { name = "ruff", marker = "extra == 'dev'", specifier = ">=0.7.1" },
@@ -3943,6 +3945,18 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/96/31/6607dab48616902f76885dfcf62c08d929796fc3b2d2318faf9fd54dbed9/pytest_asyncio-0.24.0-py3-none-any.whl", hash = "sha256:a811296ed596b69bf0b6f3dc40f83bcaf341b155a269052d82efa2b25ac7037b", size = 18024 },
 ]
 
+[[package]]
+name = "pytest-mock"
+version = "3.14.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "pytest" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/c6/90/a955c3ab35ccd41ad4de556596fa86685bf4fc5ffcc62d22d856cfd4e29a/pytest-mock-3.14.0.tar.gz", hash = "sha256:2719255a1efeceadbc056d6bf3df3d1c5015530fb40cf347c0f9afac88410bd0", size = 32814 }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/f2/3b/b26f90f74e2986a82df6e7ac7e319b8ea7ccece1caec9f8ab6104dc70603/pytest_mock-3.14.0-py3-none-any.whl", hash = "sha256:0b72c38033392a5f4621342fe11e9219ac11ec9d375f8e2a0c164539e0d70f6f", size = 9863 },
+]
+
 [[package]]
 name = "pytest-xdist"
 version = "3.6.1"