@@ -0,0 +1,510 @@
+package org.davidmoten.rx.jdbc;%0A%0Aimport static org.junit.Assert.assertTrue;%0A%0Aimport org.junit.Test;%0A%0Apublic class TxImplTest %7B%0A%0A    @Test%0A    public void testToString() %7B%0A        String s = Database.test().select(%22select score from person order by score%22) //%0A                .transactedValuesOnly() //%0A                .getAs(Integer.class) //%0A                .map(tx -%3E tx.toString()) //%0A                .firstOrError() //%0A                .blockingGet();%0A        assertTrue(s.startsWith(%22TxImpl %5B%22));%0A    %7D%0A%0A%7D%0A

add test for TxImpl.toString