diff --git a/swh/storage/tests/test_storage.py b/swh/storage/tests/test_storage.py
--- a/swh/storage/tests/test_storage.py
+++ b/swh/storage/tests/test_storage.py
@@ -2938,6 +2938,29 @@
         self.assertEqual(len(metadatas_for_origin2), 1)
         self.assertCountEqual(all_metadatas, expected_results)
 
+    def test_metadata_provider_add(self):
+        provider = {
+            'name': 'swMATH',
+            'type': 'registry',
+            'url': 'http://www.swmath.org/',
+            'metadata': {
+                'email': 'contact@swmath.org',
+                'license': 'All rights reserved'
+            }
+        }
+        provider['id'] = provider_id = self.storage.metadata_provider_add(
+            provider['name'], provider['type'], provider['url'],
+            provider['metadata'])
+        self.assertEqual(
+            provider,
+            self.storage.metadata_provider_get_by({
+               'provider_name': 'swMATH',
+               'provider_url': 'http://www.swmath.org/'
+            }))
+        self.assertEqual(
+            provider,
+            self.storage.metadata_provider_get(provider_id))
+
     def test_origin_metadata_get_by_provider_type(self):
         # given
         origin_id = self.storage.origin_add([self.origin])[0]['id']