diff --git a/test/graph_case.py b/test/graph_case.py
index ab45a2a..141c8c0 100644
--- a/test/graph_case.py
+++ b/test/graph_case.py
@@ -10,6 +10,10 @@ class GraphTestCase(unittest.TestCase):
     storetest = True
     identifier = URIRef("rdflib_test")
 
+    # storename is expected to be assigned in subclasses.
+    storename: str
+    uri: str = "sqlite://"
+
     michel = URIRef(u"michel")
     tarek = URIRef(u"tarek")
     bob = URIRef(u"bob")
@@ -22,13 +26,13 @@ class GraphTestCase(unittest.TestCase):
     namespace_dct = "http://purl.org/dc/terms/"
     namespace_saws = "http://purl.org/saws/ontology#"
 
-    def setUp(self, uri="sqlite://", storename=None):
-        store = plugin.get(storename, Store)(identifier=self.identifier)
+    def setUp(self) -> None:
+        store = plugin.get(self.storename, Store)(identifier=self.identifier)
         self.graph = Graph(store, identifier=self.identifier)
-        self.graph.open(uri, create=True)
+        self.graph.open(self.uri, create=True)
 
-    def tearDown(self, uri="sqlite://"):
-        self.graph.destroy(uri)
+    def tearDown(self) -> None:
+        self.graph.destroy(self.uri)
         self.graph.close()
 
     def addStuff(self):
diff --git a/test/test_sqlalchemy_mysql.py b/test/test_sqlalchemy_mysql.py
index 6cb6fa0..2212fef 100644
--- a/test/test_sqlalchemy_mysql.py
+++ b/test/test_sqlalchemy_mysql.py
@@ -39,12 +39,6 @@ class SQLAMySQLGraphTestCase(graph_case.GraphTestCase):
     uri = sqlalchemy_url
     create = True
 
-    def setUp(self):
-        super(SQLAMySQLGraphTestCase, self).setUp(uri=self.uri, storename=self.storename)
-
-    def tearDown(self):
-        super(SQLAMySQLGraphTestCase, self).tearDown(uri=self.uri)
-
 
 class SQLAMySQLContextTestCase(context_case.ContextTestCase):
     storetest = True
@@ -52,13 +46,6 @@ class SQLAMySQLContextTestCase(context_case.ContextTestCase):
     uri = sqlalchemy_url
     create = True
 
-    def setUp(self):
-        super(SQLAMySQLContextTestCase, self).setUp(
-            uri=self.uri, storename=self.storename)
-
-    def tearDown(self):
-        super(SQLAMySQLContextTestCase, self).tearDown(uri=self.uri)
-
     def testLenInMultipleContexts(self):
         pytest.skip("Known issue.")
 
diff --git a/test/test_sqlalchemy_postgresql.py b/test/test_sqlalchemy_postgresql.py
index a2ec044..4c83022 100644
--- a/test/test_sqlalchemy_postgresql.py
+++ b/test/test_sqlalchemy_postgresql.py
@@ -30,15 +30,6 @@ class SQLAPgSQLGraphTestCase(graph_case.GraphTestCase):
     uri = sqlalchemy_url
     create = True
 
-    def setUp(self):
-        super(SQLAPgSQLGraphTestCase, self).setUp(
-            uri=self.uri,
-            storename=self.storename,
-        )
-
-    def tearDown(self):
-        super(SQLAPgSQLGraphTestCase, self).tearDown(uri=self.uri)
-
 
 class SQLAPgSQLContextTestCase(context_case.ContextTestCase):
     storetest = True
@@ -46,15 +37,6 @@ class SQLAPgSQLContextTestCase(context_case.ContextTestCase):
     uri = sqlalchemy_url
     create = True
 
-    def setUp(self):
-        super(SQLAPgSQLContextTestCase, self).setUp(
-            uri=self.uri,
-            storename=self.storename,
-        )
-
-    def tearDown(self):
-        super(SQLAPgSQLContextTestCase, self).tearDown(uri=self.uri)
-
     def testLenInMultipleContexts(self):
         pytest.skip("Known issue.")
 
diff --git a/test/test_sqlalchemy_postgresql_pg8000.py b/test/test_sqlalchemy_postgresql_pg8000.py
index 407791e..8da93fa 100644
--- a/test/test_sqlalchemy_postgresql_pg8000.py
+++ b/test/test_sqlalchemy_postgresql_pg8000.py
@@ -5,7 +5,7 @@
 
 import pytest
 try:
-    import pg8000
+    import pg8000  # type: ignore
     assert pg8000 is not None
 except ImportError:
     pytest.skip("pg8000 not installed, skipping PgSQL tests",
@@ -33,15 +33,6 @@ class SQLAPgSQLGraphTestCase(graph_case.GraphTestCase):
     uri = sqlalchemy_url
     create = True
 
-    def setUp(self):
-        """Setup."""
-        super(SQLAPgSQLGraphTestCase, self).setUp(
-            uri=self.uri, storename=self.storename)
-
-    def tearDown(self):
-        """Teardown."""
-        super(SQLAPgSQLGraphTestCase, self).tearDown(uri=self.uri)
-
 
 class SQLAPgSQLContextTestCase(context_case.ContextTestCase):
     """Context test case."""
@@ -51,15 +42,6 @@ class SQLAPgSQLContextTestCase(context_case.ContextTestCase):
     uri = sqlalchemy_url
     create = True
 
-    def setUp(self):
-        """Setup."""
-        super(SQLAPgSQLContextTestCase, self).setUp(
-            uri=self.uri, storename=self.storename)
-
-    def tearDown(self):
-        """Teardown."""
-        super(SQLAPgSQLContextTestCase, self).tearDown(uri=self.uri)
-
     def testLenInMultipleContexts(self):
         """Test lin in multiple contexts, known issue."""
         pytest.skip("Known issue.")
diff --git a/test/test_sqlalchemy_sqlite.py b/test/test_sqlalchemy_sqlite.py
index e7ad1fe..dc9876b 100644
--- a/test/test_sqlalchemy_sqlite.py
+++ b/test/test_sqlalchemy_sqlite.py
@@ -22,26 +22,12 @@ class SQLASQLiteGraphTestCase(graph_case.GraphTestCase):
     storename = "SQLAlchemy"
     uri = sqlalchemy_url
 
-    def setUp(self):
-        super(SQLASQLiteGraphTestCase, self).setUp(
-            uri=self.uri, storename=self.storename)
-
-    def tearDown(self):
-        super(SQLASQLiteGraphTestCase, self).tearDown(uri=self.uri)
-
 
 class SQLASQLiteContextTestCase(context_case.ContextTestCase):
     storetest = True
     storename = "SQLAlchemy"
     uri = sqlalchemy_url
 
-    def setUp(self):
-        super(SQLASQLiteContextTestCase, self).setUp(
-            uri=self.uri, storename=self.storename)
-
-    def tearDown(self):
-        super(SQLASQLiteContextTestCase, self).tearDown(uri=self.uri)
-
     def testLenInMultipleContexts(self):
         pytest.skip("Known issue.")