diff --git a/tests/test_main.py b/tests/test_main.py
index 491d75f51..097063208 100644
--- a/tests/test_main.py
+++ b/tests/test_main.py
@@ -18,18 +18,19 @@ class TestMain(TestCase):
         self.original_cwd = os.getcwd()
         self.tempdir = tempfile.mkdtemp()
         os.chdir(self.tempdir)
+        self.patcher = patch("aider.main.Coder.check_model_availability")
+        self.mock_check = self.patcher.start()
+        self.mock_check.return_value = True
 
     def tearDown(self):
         os.chdir(self.original_cwd)
         shutil.rmtree(self.tempdir)
+        self.patcher.stop()
 
     def test_main_with_empty_dir_no_files_on_command(self):
-        with patch("aider.main.Coder.check_model_availability") as mock_check:
-            mock_check.return_value = True
-
-            pipe_input = create_input(StringIO(""))
-            main([], input=pipe_input, output=DummyOutput())
-            pipe_input.close()
+        pipe_input = create_input(StringIO(""))
+        main([], input=pipe_input, output=DummyOutput())
+        pipe_input.close()
 
     def test_main_with_empty_dir_new_file(self):
         pipe_input = create_input(StringIO(""))