Implement NMS#createNativeProxyCommandSenderin the test toolkit

Since this doesn't have to worry about NMS compatibility, MockNativeProxyCommandSender is basically the same as the old implementation of NativeProxyCommandSender :P

commandapi-platforms/commandapi-bukkit/commandapi-bukkit-test-toolkit/src/main/java/dev/jorel/commandapi/MockCommandAPIBukkit.java

@@ -130,6 +130,11 @@ public MockCommandSource getBrigadierSourceFromCommandSender(AbstractCommandSend
 		return new MockCommandSource(sender.getSource());
 	}
 
+	@Override
+	public NativeProxyCommandSender createNativeProxyCommandSender(CommandSender caller, CommandSender callee, Location location, World world) {
+		return new MockNativeProxyCommandSender(caller, callee, location, world);
+	}
+
 	// Miscellaneous methods
 	/**
 	 * A global toggle for whether the default logger returned by {@link #getLogger()} should print messages to the

commandapi-platforms/commandapi-bukkit/commandapi-bukkit-test-toolkit/src/main/java/dev/jorel/commandapi/wrappers/MockNativeProxyCommandSender.java

@@ -0,0 +1,166 @@
+package dev.jorel.commandapi.wrappers;
+
+import net.kyori.adventure.text.Component;
+import org.bukkit.Location;
+import org.bukkit.Server;
+import org.bukkit.World;
+import org.bukkit.command.CommandSender;
+import org.bukkit.permissions.Permission;
+import org.bukkit.permissions.PermissionAttachment;
+import org.bukkit.permissions.PermissionAttachmentInfo;
+import org.bukkit.plugin.Plugin;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Set;
+import java.util.UUID;
+
+public class MockNativeProxyCommandSender implements NativeProxyCommandSender {
+
+	private final CommandSender caller;
+	private final CommandSender callee;
+	private final Location location;
+	private final World world;
+
+	/**
+	 * Constructs a NativeProxyCommandSender, which is basically Minecraft's CommandListenerWrapper
+	 * @param caller the command sender that actually sent the command
+	 * @param callee the command sender that will be executing the command
+	 * @param location the proxied location that the command will be run at
+	 * @param world the proxied world that the command will be run in
+	 */
+	public MockNativeProxyCommandSender(CommandSender caller, CommandSender callee, Location location, World world) {
+		this.caller = caller;
+		this.callee = callee == null ? caller : callee;
+		this.location = location;
+		this.world = world;
+	}
+
+	// NativeProxyCommandSenderMethods
+	@Override
+	public Location getLocation() {
+		return this.location;
+	}
+
+	@Override
+	public World getWorld() {
+		return this.world;
+	}
+
+	// ProxiedCommandSender methods
+	@Override
+	public @NotNull CommandSender getCaller() {
+		return this.caller;
+	}
+
+	@Override
+	public @NotNull CommandSender getCallee() {
+		return this.callee;
+	}
+
+	// CommandSender methods
+	@Override
+	public void sendMessage(@NotNull String s) {
+		this.caller.sendMessage(s);
+	}
+
+	@Override
+	public void sendMessage(@NotNull String... strings) {
+		this.caller.sendMessage(strings);
+	}
+
+	@Override
+	public void sendMessage(@Nullable UUID uuid, @NotNull String s) {
+		this.caller.sendMessage(uuid, s);
+	}
+
+	@Override
+	public void sendMessage(@Nullable UUID uuid, @NotNull String... strings) {
+		this.caller.sendMessage(uuid, strings);
+	}
+
+	@Override
+	public @NotNull Server getServer() {
+		return this.callee.getServer();
+	}
+
+	@Override
+	public @NotNull String getName() {
+		return this.callee.getName();
+	}
+
+	@Override
+	public @NotNull Spigot spigot() {
+		return this.caller.spigot();
+	}
+
+	@Override
+	public @NotNull Component name() {
+		return this.callee.name();
+	}
+
+	@Override
+	public boolean isPermissionSet(@NotNull String s) {
+		return this.caller.isPermissionSet(s);
+	}
+
+	@Override
+	public boolean isPermissionSet(@NotNull Permission permission) {
+		return this.caller.isPermissionSet(permission);
+	}
+
+	@Override
+	public boolean hasPermission(@NotNull String s) {
+		return this.caller.hasPermission(s);
+	}
+
+	@Override
+	public boolean hasPermission(@NotNull Permission permission) {
+		return this.caller.hasPermission(permission);
+	}
+
+	@Override
+	public @NotNull PermissionAttachment addAttachment(@NotNull Plugin plugin, @NotNull String s, boolean b) {
+		return this.caller.addAttachment(plugin, s, b);
+	}
+
+	@Override
+	public @NotNull PermissionAttachment addAttachment(@NotNull Plugin plugin) {
+		return this.caller.addAttachment(plugin);
+	}
+
+	@Override
+	public @Nullable PermissionAttachment addAttachment(@NotNull Plugin plugin, @NotNull String s, boolean b, int i) {
+		return this.caller.addAttachment(plugin, s, b, i);
+	}
+
+	@Override
+	public @Nullable PermissionAttachment addAttachment(@NotNull Plugin plugin, int i) {
+		return this.caller.addAttachment(plugin, i);
+	}
+
+	@Override
+	public void removeAttachment(@NotNull PermissionAttachment permissionAttachment) {
+		this.caller.removeAttachment(permissionAttachment);
+	}
+
+	@Override
+	public void recalculatePermissions() {
+		this.caller.recalculatePermissions();
+	}
+
+	@Override
+	public @NotNull Set<PermissionAttachmentInfo> getEffectivePermissions() {
+		return this.caller.getEffectivePermissions();
+	}
+
+	@Override
+	public boolean isOp() {
+		return this.caller.isOp();
+	}
+
+	@Override
+	public void setOp(boolean b) {
+		this.caller.setOp(b);
+	}
+}