### Question:
PendingTransactionFilter extends Filter<String> { public PendingTransactionFilter(CITAj citaj, Callback<String> callback) { super(citaj, callback); } PendingTransactionFilter(CITAj citaj, Callback<String> callback);   }### Answer:
@Test public void testPendingTransactionFilter() throws Exception { AppLog ethLog = objectMapper.readValue( "{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":[\"0x31c2342b1e0b8ffda1507fbffddf213c4b3c1e819ff6a84b943faabb0ebf2403\",\"0xccc0d2e07c1febcaca0c3341c4e1268204b06fefa4bb0c8c0d693d8e581c82da\"]}", AppLog.class); runTest(ethLog, citaj.appPendingTransactionHashFlowable()); }