### Question:
BackendKeyData extends PGMessage { public static BackendKeyData loadFromPacket(byte[] packet) { PGProto proto = new PGProto(packet, 5); return new BackendKeyData(proto.readInt32(), proto.readInt32()); } @SuppressWarnings("unused") private  BackendKeyData();  BackendKeyData(int pid, int key); int getKey(); void setKey(int key); int getPid(); void setPid(int pid); static int genKey(); static BackendKeyData loadFromPacket(byte[] packet); @Override String toString();  }### Answer:
@Test public void testLoadFromPacket() throws Exception { BackendKeyData backendKeyData = BackendKeyData.loadFromPacket(packet); int expectedPid = 31; assertEquals(backendKeyData.getPid(), expectedPid); int expectedKey = 790256319; assertEquals(backendKeyData.getKey(), expectedKey); }