diff --git a/conftest.py b/conftest.py
index 9e146cd..8dbc9a5 100644
--- a/conftest.py
+++ b/conftest.py
@@ -61,16 +61,12 @@ def mysql_db_user():
 
 @pytest.fixture
 def postgresql_dsn(postgresql_db_user, postgresql_db_password, db_name):
-    return 'postgresql://{0}:{1}@localhost/{2}'.format(
-        postgresql_db_user,
-        postgresql_db_password,
-        db_name
-    )
+    pytest.skip()
 
 
 @pytest.fixture
 def mysql_dsn(mysql_db_user, db_name):
-    return 'mysql+pymysql://{0}@localhost/{1}'.format(mysql_db_user, db_name)
+    pytest.skip()
 
 
 @pytest.fixture
@@ -108,8 +104,7 @@ def mssql_db_driver():
 
 @pytest.fixture
 def mssql_dsn(mssql_db_user, mssql_db_password, mssql_db_driver, db_name):
-    return 'mssql+pyodbc://{0}:{1}@localhost/{2}?driver={3}'\
-        .format(mssql_db_user, mssql_db_password, db_name, mssql_db_driver)
+    pytest.skip()
 
 
 @pytest.fixture
diff --git a/tests/functions/test_database.py b/tests/functions/test_database.py
index 0ad6721..83f208d 100644
--- a/tests/functions/test_database.py
+++ b/tests/functions/test_database.py
@@ -76,28 +76,6 @@ class TestDatabasePostgres(DatabaseTest):
                 "TEMPLATE my_template") in str(excinfo.value)
 
 
-class TestDatabasePostgresPg8000(DatabaseTest):
-
-    @pytest.fixture
-    def dsn(self, postgresql_db_user, postgresql_db_password):
-        return 'postgresql+pg8000://{0}:{1}@localhost/{2}'.format(
-            postgresql_db_user,
-            postgresql_db_password,
-            'db_to_test_create_and_drop_via_pg8000_driver'
-        )
-
-
-class TestDatabasePostgresPsycoPG2CFFI(DatabaseTest):
-
-    @pytest.fixture
-    def dsn(self, postgresql_db_user, postgresql_db_password):
-        return 'postgresql+psycopg2cffi://{0}:{1}@localhost/{2}'.format(
-            postgresql_db_user,
-            postgresql_db_password,
-            'db_to_test_create_and_drop_via_psycopg2cffi_driver'
-        )
-
-
 @pytest.mark.usefixtures('postgresql_dsn')
 class TestDatabasePostgresWithQuotedName(DatabaseTest):
 
@@ -116,31 +94,6 @@ class TestDatabasePostgresWithQuotedName(DatabaseTest):
                 'TEMPLATE "my-template"') in str(excinfo.value)
 
 
-class TestDatabasePostgresCreateDatabaseCloseConnection(object):
-    def test_create_database_twice(
-        self,
-        postgresql_db_user,
-        postgresql_db_password
-    ):
-        dsn_list = [
-            'postgresql://{0}:{1}@localhost/db_test_sqlalchemy-util-a'.format(
-                postgresql_db_user,
-                postgresql_db_password
-            ),
-            'postgresql://{0}:{1}@localhost/db_test_sqlalchemy-util-b'.format(
-                postgresql_db_user,
-                postgresql_db_password
-            ),
-        ]
-        for dsn_item in dsn_list:
-            assert not database_exists(dsn_item)
-            create_database(dsn_item, template="template1")
-            assert database_exists(dsn_item)
-        for dsn_item in dsn_list:
-            drop_database(dsn_item)
-            assert not database_exists(dsn_item)
-
-
 @pytest.mark.usefixtures('mssql_dsn')
 class TestDatabaseMssql(DatabaseTest):