diff --git a/rendercv/rendering.py b/rendercv/rendering.py
index 4b03ae6..c6049bd 100644
--- a/rendercv/rendering.py
+++ b/rendercv/rendering.py
@@ -264,7 +264,7 @@ def read_input_file(file_path: str) -> RenderCVDataModel:
     return data
 
 
-def render_template(data: RenderCVDataModel, output_path: str = None):
+def render_template(data: RenderCVDataModel, output_path: str = None) -> str:
     """Render the template using the given data.
 
     Args:
diff --git a/tests/test_rendering.py b/tests/test_rendering.py
index 07917da..2aa59b7 100644
--- a/tests/test_rendering.py
+++ b/tests/test_rendering.py
@@ -405,8 +405,10 @@ class TestDataModel(unittest.TestCase):
             os.path.dirname(__file__), "reference_files", "John_Doe_CV.tex"
         )
 
-        rendering.run_latex(latex_file_path)
-
+        pdf_file = rendering.run_latex(latex_file_path)
+        
+        # Check if the output file exists:
+        self.assertTrue(os.path.exists(pdf_file))
 
 if __name__ == "__main__":
     unittest.main()