Adding validation to INFO command

src/command/CommandValidator.java

@@ -10,7 +10,6 @@ import java.util.stream.IntStream;
 public class CommandValidator {
 
     private CommandValidator() {
-
     }
 
     private static final class InstanceHolder {
@@ -49,8 +48,11 @@ public class CommandValidator {
     }
 
     public boolean validateGetCommand(List<String> args) {
-
         return args != null && args.size() == 1;
     }
 
+
+    public boolean validateInfoCommand(List<String> args) {
+        return args != null && args.size() == 1 && "replication".equalsIgnoreCase(args.getFirst());
+    }
 }

src/command/InfoCommand.java

 package command;
 
 import model.Command;
-import util.Response;
 import server.ServerInfo;
+import util.Response;
 
 import java.util.List;
 import java.util.Map;
@@ -10,6 +10,7 @@ import java.util.stream.Collectors;
 
 public class InfoCommand implements CommandExecutable<byte[]> {
     private final ServerInfo configuration = ServerInfo.getInstance();
+    private final CommandValidator validator = CommandValidator.getInstance();
     List<String> args;
 
     public InfoCommand(List<String> args) {
@@ -18,6 +19,9 @@ public class InfoCommand implements CommandExecutable<byte[]> {
 
     @Override
     public byte[] execute() {
+        if (!validator.validateInfoCommand(args)) {
+            return "unsupported  args".getBytes();
+        }
         String command = args.getFirst();
         if (command.equalsIgnoreCase(Command.REPLICATION.getValue())) {
             Map<String, String> info = configuration.getInfo();