1 files changed, 16 insertions, 0 deletions
diff --git a/lib/sqlalchemy/testing/fixtures.py b/lib/sqlalchemy/testing/fixtures.py
index ecc20f163..7228e5afe 100644
--- a/lib/sqlalchemy/testing/fixtures.py
+++ b/lib/sqlalchemy/testing/fixtures.py
@@ -20,6 +20,7 @@ from .util import drop_all_tables_from_metadata
 from .. import event
 from .. import util
 from ..orm import declarative_base
+from ..orm import DeclarativeBase
 from ..orm import registry
 from ..schema import sort_tables_and_constraints
 
@@ -82,6 +83,21 @@ class TestBase:
         yield reg
         reg.dispose()
 
+    @config.fixture
+    def decl_base(self, metadata):
+        _md = metadata
+
+        class Base(DeclarativeBase):
+            metadata = _md
+            type_annotation_map = {
+                str: sa.String().with_variant(
+                    sa.String(50), "mysql", "mariadb"
+                )
+            }
+
+        yield Base
+        Base.registry.dispose()
+
     @config.fixture()
     def future_connection(self, future_engine, connection):
         # integrate the future_engine and connection fixtures so