test: add test for no matching files.

tests/test_integration_rename.py

@@ -16,3 +16,18 @@ def test_no_files(tmp_path: Path, cwd, mocker: MockerFixture):
         # WHEN
         with cwd(tmp_path):
             main()
+
+    @staticmethod
+    def test_no_matching_files(tmp_path: Path, cwd, mocker: MockerFixture):
+        # GIVEN
+        mocker.patch("sys.argv", ["stub_name", "rename", "input", "output"])
+        for file in (files := ["file_1", "file_2"]):
+            (tmp_path / file).write_text("")
+
+        # WHEN
+        with cwd(tmp_path):
+            main()
+
+        # THEN
+        for file in files:
+            assert (tmp_path / file).is_file()