### Question:
RpcValue implements RpcItem { @Override public Boolean asBoolean() { switch (value) { case "0x0": return false; case "0x1": return true; default: throw new RpcValueException("The value is not boolean format."); } } RpcValue(RpcValue value);  RpcValue(Address value); private  RpcValue();  RpcValue(String value);  RpcValue(byte[] value);  RpcValue(BigInteger value);  RpcValue(boolean value);  RpcValue(Boolean value);  RpcValue(Bytes value); @Override boolean isEmpty(); @Override boolean isNull(); @Override String asString(); @Override byte[] asByteArray(); @Override Address asAddress(); @Override Bytes asBytes(); @Override BigInteger asInteger(); @Override Boolean asBoolean(); @Override String toString(); final static RpcValue NULL; }### Answer:
@Test void testAsBoolean() { assertThrows(RpcValueException.class, plainStringValue::asBoolean); assertThrows(RpcValueException.class, bytesValue::asBoolean); assertThrows(RpcValueException.class, oddIntegerValue::asBoolean); assertThrows(RpcValueException.class, evenIntegerValue::asBoolean); assertTrue(booleanValue.asBoolean()); }