diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0bd2843..85d690c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -49,7 +49,7 @@ jobs:
         make test
     - name: Run PostgreSQL tests
       env:
-        DATABASE_URL: 'postgresql+psycopg2://postgres:postgres@127.0.0.1:${{ job.services.postgres.ports[5432] }}/dataset'
+        DATABASE_URL: 'postgresql://postgres:postgres@127.0.0.1:${{ job.services.postgres.ports[5432] }}/dataset'
       run: |
         make test
     - name: Run MariaDB tests
diff --git a/setup.py b/setup.py
index 9685626..d319316 100644
--- a/setup.py
+++ b/setup.py
@@ -28,7 +28,7 @@ setup(
     namespace_packages=[],
     include_package_data=False,
     zip_safe=False,
-    install_requires=["sqlalchemy >= 1.3.2", "alembic >= 0.6.2", "banal >= 1.0.1",],
+    install_requires=["sqlalchemy >= 1.3.2", "alembic >= 0.6.2", "banal >= 1.0.1"],
     extras_require={
         "dev": [
             "pip",
diff --git a/test/test_dataset.py b/test/test_dataset.py
index 5e63781..af10db2 100644
--- a/test/test_dataset.py
+++ b/test/test_dataset.py
@@ -153,6 +153,7 @@ class TableTestCase(unittest.TestCase):
     def setUp(self):
         self.db = connect()
         self.tbl = self.db["weather"]
+        self.tbl.delete()
         for row in TEST_DATA:
             self.tbl.insert(row)
 
@@ -253,15 +254,9 @@ class TableTestCase(unittest.TestCase):
 
     def test_cased_column_names(self):
         tbl = self.db["cased_column_names"]
-        tbl.insert(
-            {"place": "Berlin",}
-        )
-        tbl.insert(
-            {"Place": "Berlin",}
-        )
-        tbl.insert(
-            {"PLACE ": "Berlin",}
-        )
+        tbl.insert({"place": "Berlin"})
+        tbl.insert({"Place": "Berlin"})
+        tbl.insert({"PLACE ": "Berlin"})
         assert len(tbl.columns) == 2, tbl.columns
         assert len(list(tbl.find(Place="Berlin"))) == 3
         assert len(list(tbl.find(place="Berlin"))) == 3
@@ -391,14 +386,14 @@ class TableTestCase(unittest.TestCase):
     def test_insert_many(self):
         data = TEST_DATA * 100
         self.tbl.insert_many(data, chunk_size=13)
-        assert len(self.tbl) == len(data) + 6
+        assert len(self.tbl) == len(data)
 
     def test_chunked_insert(self):
         data = TEST_DATA * 100
         with chunked.ChunkedInsert(self.tbl) as chunk_tbl:
             for item in data:
                 chunk_tbl.insert(item)
-        assert len(self.tbl) == len(data) + 6
+        assert len(self.tbl) == len(data) + 6, (len(self.tbl), len(data))
 
     def test_chunked_insert_callback(self):
         data = TEST_DATA * 100