### Question:
MySqlTransactionController extends TransactionController { @Override public boolean canOpenTransaction() { return implictTransactionMarker || !autoCommit; } MySqlTransactionController(); @Override boolean canOpenTransaction(); @Override boolean isAutoCommit(); @Override void setAutoCommit(boolean autoCommit);  }### Answer:
@Test public void testCanOpenTransaction() throws Exception { TransactionController transactionController = new MySqlTransactionController(); assertFalse(transactionController.canOpenTransaction()); transactionController.setAutoCommit(false); assertTrue(transactionController.canOpenTransaction()); transactionController.setAutoCommit(true); assertFalse(transactionController.canOpenTransaction()); transactionController.markImplicitTransaction(); assertTrue(transactionController.canOpenTransaction()); transactionController.onTransactionEnd(); assertFalse(transactionController.canOpenTransaction()); transactionController.setAutoCommit(false); transactionController.markImplicitTransaction(); assertTrue(transactionController.canOpenTransaction()); transactionController.onTransactionEnd(); assertTrue(transactionController.canOpenTransaction()); }