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