diff --git a/tests/auxiliary_files/test_copy_theme_files_to_output_directory_custom_theme/dummytheme/theme_auxiliary_dir/theme_auxiliary_file.txt b/tests/auxiliary_files/test_copy_theme_files_to_output_directory_custom_theme/dummytheme/theme_auxiliary_dir/theme_auxiliary_file.txt
new file mode 100644
index 0000000..e69de29
diff --git a/tests/auxiliary_files/test_copy_theme_files_to_output_directory_custom_theme/theme_auxiliary_files/theme_auxiliary_dir/theme_auxiliary_file.txt b/tests/auxiliary_files/test_copy_theme_files_to_output_directory_custom_theme/theme_auxiliary_files/theme_auxiliary_dir/theme_auxiliary_file.txt
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_data_models.py b/tests/test_data_models.py
index ffcf59d..c412f0a 100644
--- a/tests/test_data_models.py
+++ b/tests/test_data_models.py
@@ -93,11 +93,20 @@ def test_read_input_file_invalid_file(tmp_path):
         dm.read_input_file(invalid_file_path)
 
 
-def test_get_a_sample_data_model():
-    data_model = dm.get_a_sample_data_model("John Doe")
+@pytest.mark.parametrize(
+    "theme",
+    dm.available_themes,
+)
+def test_get_a_sample_data_model(theme):
+    data_model = dm.get_a_sample_data_model("John Doe", theme)
     assert isinstance(data_model, dm.RenderCVDataModel)
 
 
+def test_get_a_sample_data_model_invalid_theme():
+    with pytest.raises(ValueError):
+        dm.get_a_sample_data_model("John Doe", "invalid")
+
+
 def test_generate_json_schema():
     schema = dm.generate_json_schema()
     assert isinstance(schema, dict)
diff --git a/tests/test_renderer.py b/tests/test_renderer.py
index 3f4de94..4a56adb 100644
--- a/tests/test_renderer.py
+++ b/tests/test_renderer.py
@@ -416,6 +416,11 @@ def test_copy_theme_files_to_output_directory_custom_theme(
         pathlib.Path(custom_theme_directory_path / "theme_auxiliary_dir").mkdir(
             exist_ok=True
         )
+        pathlib.Path(
+            custom_theme_directory_path
+            / "theme_auxiliary_dir"
+            / "theme_auxiliary_file.txt"
+        ).touch()
         init_file = pathlib.Path(custom_theme_directory_path / "__init__.py")
 
         init_file.touch()