diff --git a/erpnext/regional/doctype/import_supplier_invoice/test_import_supplier_invoice.py b/erpnext/regional/doctype/import_supplier_invoice/test_import_supplier_invoice.py
index 77143d5b9ab..a955839d1a3 100644
--- a/erpnext/regional/doctype/import_supplier_invoice/test_import_supplier_invoice.py
+++ b/erpnext/regional/doctype/import_supplier_invoice/test_import_supplier_invoice.py
@@ -1,9 +1,27 @@
-# Copyright (c) 2019, Frappe Technologies Pvt. Ltd. and Contributors
+# Copyright (c) 2026, Frappe Technologies Pvt. Ltd. and Contributors
 # See license.txt
-# import frappe
 
+import frappe
+
+from erpnext.regional.doctype.import_supplier_invoice.import_supplier_invoice import get_country
 from erpnext.tests.utils import ERPNextTestSuite
 
 
 class TestImportSupplierInvoice(ERPNextTestSuite):
-	pass
+	"""The importer requires a default stock UOM and resolves country codes from the file."""
+
+	@ERPNextTestSuite.change_settings("Stock Settings", {"stock_uom": ""})
+	def test_validate_requires_a_default_uom(self):
+		doc = frappe.new_doc("Import Supplier Invoice")
+		self.assertRaises(frappe.ValidationError, doc.validate)
+
+	@ERPNextTestSuite.change_settings("Stock Settings", {"stock_uom": "Nos"})
+	def test_validate_passes_with_a_default_uom(self):
+		frappe.new_doc("Import Supplier Invoice").validate()
+
+	def test_get_country_resolves_a_known_code(self):
+		country = frappe.get_all("Country", filters={"code": ["!=", ""]}, fields=["name", "code"], limit=1)[0]
+		self.assertEqual(get_country(country.code), country.name)
+
+	def test_get_country_rejects_an_unknown_code(self):
+		self.assertRaises(frappe.ValidationError, get_country, "__no_such_country_code__")