Fixed #25055 -- Made m2m long name testing friendlier for 3rd party databases.

1 files changed, 15 insertions, 11 deletions

diff --git a/tests/invalid_models_tests/test_models.py b/tests/invalid_models_tests/test_models.py
index a2d9f36557..fe27814f83 100644
--- a/tests/invalid_models_tests/test_models.py
+++ b/tests/invalid_models_tests/test_models.py
@@ -328,17 +328,21 @@ class FieldNamesTests(IsolatedModelsTestCase):
 
         # First error because of M2M field set on the model with long name.
         m2m_long_name = "verylongmodelnamezzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz_id"
-        expected = [
-            Error(
-                'Autogenerated column name too long for M2M field "%s". '
-                'Maximum length is "%s" for database "%s".'
-                % (m2m_long_name, self.max_column_name_length, self.column_limit_db_alias),
-                hint=("Use 'through' to create a separate model for "
-                    "M2M and then set column_name using 'db_column'."),
-                obj=ModelWithLongField,
-                id='models.E019',
-            )
-        ]
+        if self.max_column_name_length > len(m2m_long_name):
+            # Some databases support names longer than the test name.
+            expected = []
+        else:
+            expected = [
+                Error(
+                    'Autogenerated column name too long for M2M field "%s". '
+                    'Maximum length is "%s" for database "%s".'
+                    % (m2m_long_name, self.max_column_name_length, self.column_limit_db_alias),
+                    hint=("Use 'through' to create a separate model for "
+                        "M2M and then set column_name using 'db_column'."),
+                    obj=ModelWithLongField,
+                    id='models.E019',
+                )
+            ]
 
         # Second error because the FK specified in the `through` model
         # `m2msimple` has auto-genererated name longer than allowed.