Update

src/main/java/systems/brn/plasticgun/testing/DamageTester.java

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+package systems.brn.plasticgun.testing;
+
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.EntityType;
+import net.minecraft.entity.EquipmentSlot;
+import net.minecraft.entity.LivingEntity;
+import net.minecraft.entity.attribute.DefaultAttributeContainer;
+import net.minecraft.entity.attribute.EntityAttributes;
+import net.minecraft.entity.damage.DamageSource;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.item.ItemStack;
+import net.minecraft.item.Items;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.text.Text;
+import net.minecraft.util.Arm;
+import net.minecraft.util.math.Vec3d;
+import net.minecraft.world.World;
+import eu.pb4.polymer.core.api.entity.PolymerEntity;
+
+import java.util.Collections;
+
+import static systems.brn.plasticgun.PlasticGun.*;
+
+public class DamageTester extends LivingEntity implements PolymerEntity {
+
+    public DamageTester(Vec3d pos, World world) {
+        super(DAMAGE_TESTER_ENTITY_TYPE, world);
+        this.setPos(pos.x, pos.y, pos.z);
+    }
+
+    public DamageTester(EntityType<systems.brn.plasticgun.testing.DamageTester> entityType, World world) {
+        super(entityType, world);
+    }
+
+    @Override
+    public boolean damage(DamageSource source, float amount) {
+        Entity attacker = source.getAttacker();
+        if (attacker instanceof PlayerEntity player) {
+            player.sendMessage(Text.literal("You damaged by " + amount));
+            if (player.isSneaking()) {
+                this.remove(RemovalReason.KILLED);
+            }
+        }
+        return false;
+    }
+
+
+    public static DefaultAttributeContainer.Builder createDamageTesterAttributes() {
+        return LivingEntity.createLivingAttributes()
+                .add(EntityAttributes.GENERIC_MAX_HEALTH, 1.0)
+                .add(EntityAttributes.GENERIC_ATTACK_DAMAGE, 0.0);
+    }
+
+    @Override
+    public EntityType<?> getPolymerEntityType(ServerPlayerEntity player) {
+        return EntityType.ZOMBIE;
+    }
+
+    @Override
+    public Iterable<ItemStack> getArmorItems() {
+        return Collections.emptyList();
+    }
+
+    @Override
+    public ItemStack getEquippedStack(EquipmentSlot slot) {
+        return Items.WITHER_SKELETON_SKULL.getDefaultStack();
+    }
+
+    @Override
+    public void equipStack(EquipmentSlot slot, ItemStack stack) {
+
+    }
+
+    @Override
+    public Arm getMainArm() {
+        return Arm.RIGHT;
+    }
+}