[tests] bring back parallel transaction tests

test/Test/Database/Transactions.hs

@@ -228,7 +228,7 @@ tests = describe "Database Transactions" $ do
 -- | Testing the transactional behaviour outside the classic GGTX operations.
 -- We test that throwing exceptions in IO leads to rollbacks.
 counterDBTests :: Spec
-counterDBTests = sequential $ around withTestCounterDB $
+counterDBTests = parallel $ around withTestCounterDB $
   describe "Counter Transactions" $ do
     describe "Opaleye count queries" $ do
       it "Supports counting rows" opaCountQueries
@@ -248,7 +248,7 @@ counterDBTests = sequential $ around withTestCounterDB $
 -- | Testing the transactional behaviour inside the classic GGTX operations.
 -- We test that throwing something like a 'NodeError' results in a proper rollback.
 ggtxDBTests :: Spec
-ggtxDBTests = sequential $ around withTestDB $ beforeWith (\ctx -> setupEnvironment ctx >>= (const $ pure ctx)) $
+ggtxDBTests = parallel $ around withTestDB $ beforeWith (\ctx -> setupEnvironment ctx >>= (const $ pure ctx)) $
   describe "GGTX Transactions" $ do
     describe "Rollback support" $ do
       it "can rollback if a ggtx error gets thrown" testGGTXErrorRollback