diff --git a/tests/test_update_form.py b/tests/test_update_form.py
new file mode 100644
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--- /dev/null
+++ b/tests/test_update_form.py
@@ -0,0 +1,54 @@
+# Copyright (c) 2022, 2023 Humanitarian OpenStreetMap Team
+#
+# This file is part of osm_fieldwork.
+#
+#     osm-fieldwork is free software: you can redistribute it and/or modify
+#     it under the terms of the GNU General Public License as published by
+#     the Free Software Foundation, either version 3 of the License, or
+#     (at your option) any later version.
+#
+#     osm-fieldwork is distributed in the hope that it will be useful,
+#     but WITHOUT ANY WARRANTY; without even the implied warranty of
+#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#     GNU General Public License for more details.
+#
+#     You should have received a copy of the GNU General Public License
+#     along with osm_fieldwork.  If not, see <https:#www.gnu.org/licenses/>.
+#
+"""Test functionalty of update_form.py."""
+
+from io import BytesIO
+from pathlib import Path
+
+from openpyxl import load_workbook
+
+from osm_fieldwork.update_form import update_xls_form
+
+
+def test_merge_mandatory_fields():
+    """Merge the mandatory fields XLSForm to a test survey form."""
+    buildings_form = Path(__file__).parent.parent / "osm_fieldwork" / "xlsforms" / "buildings.xls"
+    with open(buildings_form, "rb") as xlsform:
+        form_bytes = BytesIO(xlsform.read())
+
+    updated_form = update_xls_form(form_bytes)
+
+    # Load the updated form using openpyxl
+    workbook = load_workbook(filename=BytesIO(updated_form.getvalue()))
+    if "survey" not in workbook.sheetnames:
+        raise ValueError("The 'survey' sheet was not found in the workbook")
+    sheet = workbook["survey"]
+
+    # Find the index of the 'name' column
+    name_col = None
+    for col in sheet.iter_cols(1, sheet.max_column):
+        if col[0].value == "name":
+            name_col = col
+            break
+
+    assert name_col is not None, "The 'name' column was not found."
+
+    # Check if 'existing' is present in the 'name' column (skip the header)
+    existing_found = any(cell.value == "existing" for cell in name_col[1:])
+
+    assert existing_found, "'existing' value not found in the 'name' column."