Adds some tests for the salvage helper

pom.xml

@@ -35,6 +35,10 @@
             <id>vault-repo</id>
             <url>https://nexus.hc.to/content/repositories/pub_releases</url>
         </repository>
+        <repository>
+            <id>papermc</id>
+            <url>https://repo.papermc.io/repository/maven-public/</url>
+        </repository>
     </repositories>
     <distributionManagement>
         <repository>
@@ -86,6 +90,18 @@
             <version>1.0-SNAPSHOT</version>
             <scope>compile</scope>
         </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>5.9.2</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.github.seeseemelk</groupId>
+            <artifactId>MockBukkit-v1.19</artifactId>
+            <version>2.144.3</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <!-- Build information -->

src/main/java/net/knarcraft/blacksmith/BlacksmithPlugin.java

@@ -19,9 +19,12 @@ import net.knarcraft.knarlib.formatting.Translator;
 import net.knarcraft.knarlib.util.UpdateChecker;
 import org.bukkit.command.PluginCommand;
 import org.bukkit.configuration.file.FileConfiguration;
+import org.bukkit.plugin.PluginDescriptionFile;
 import org.bukkit.plugin.PluginManager;
 import org.bukkit.plugin.java.JavaPlugin;
+import org.bukkit.plugin.java.JavaPluginLoader;
 
+import java.io.File;
 import java.util.logging.Level;
 
 /**
@@ -34,6 +37,22 @@ public class BlacksmithPlugin extends JavaPlugin {
     private static Translator translator;
     private static StringFormatter stringFormatter;
 
+    /**
+     * Constructor required for MockBukkit
+     */
+    @SuppressWarnings("unused")
+    public BlacksmithPlugin() {
+        super();
+    }
+
+    /**
+     * Constructor required for MockBukkit
+     */
+    @SuppressWarnings("unused")
+    protected BlacksmithPlugin(JavaPluginLoader loader, PluginDescriptionFile descriptionFile, File dataFolder, File file) {
+        super(loader, descriptionFile, dataFolder, file);
+    }
+
     /**
      * Gets an instance of the Blacksmith plugin
      *

src/main/java/net/knarcraft/blacksmith/config/NPCSettings.java

@@ -2,9 +2,9 @@ package net.knarcraft.blacksmith.config;
 
 import net.citizensnpcs.api.util.DataKey;
 import net.knarcraft.blacksmith.BlacksmithPlugin;
-import net.knarcraft.blacksmith.trait.BlacksmithTrait;
 import net.knarcraft.blacksmith.util.ConfigHelper;
 import net.knarcraft.blacksmith.util.InputParsingHelper;
+import net.knarcraft.blacksmith.util.ItemHelper;
 import org.bukkit.Material;
 import org.bukkit.enchantments.Enchantment;
 import org.bukkit.inventory.ItemStack;
@@ -460,7 +460,7 @@ public class NPCSettings {
             }
 
             Material material = InputParsingHelper.matchMaterial(item);
-            if (material != null && BlacksmithTrait.isRepairable(new ItemStack(material, 1))) {
+            if (material != null && ItemHelper.isRepairable(new ItemStack(material, 1))) {
                 if (!blacklist) {
                     reforgeAbleItems.add(material);
                 } else {

src/main/java/net/knarcraft/blacksmith/trait/BlacksmithTrait.java

@@ -11,11 +11,9 @@ import net.knarcraft.blacksmith.util.ItemHelper;
 import net.knarcraft.knarlib.formatting.StringFormatter;
 import org.bukkit.Bukkit;
 import org.bukkit.Material;
-import org.bukkit.enchantments.EnchantmentTarget;
 import org.bukkit.entity.LivingEntity;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
-import org.bukkit.inventory.meta.Damageable;
 
 import java.util.Calendar;
 import java.util.HashMap;
@@ -180,7 +178,7 @@ public class BlacksmithTrait extends Trait {
         //Refuse if not repairable, or if reforge-able items is set, but doesn't include the held item
         List<Material> reforgeAbleItems = config.getReforgeAbleItems();
         if ((!this.config.getRepairAnvils() || !ItemHelper.isAnvil(hand.getType(), false)) &&
-                (!isRepairable(hand) || (!reforgeAbleItems.isEmpty() && !reforgeAbleItems.contains(hand.getType())))) {
+                (!ItemHelper.isRepairable(hand) || (!reforgeAbleItems.isEmpty() && !reforgeAbleItems.contains(hand.getType())))) {
             String invalidMessage = StringFormatter.replacePlaceholder(config.getInvalidItemMessage(),
                     "{title}", config.getBlacksmithTitle());
             sendNPCMessage(this.npc, player, invalidMessage);
@@ -225,14 +223,4 @@ public class BlacksmithTrait extends Trait {
         player.getInventory().setItemInMainHand(null);
     }
 
-    /**
-     * Gets whether the given item is repairable
-     *
-     * @param item <p>The item to check</p>
-     * @return <p>True if the item is repairable</p>
-     */
-    public static boolean isRepairable(ItemStack item) {
-        return item.getItemMeta() instanceof Damageable && EnchantmentTarget.BREAKABLE.includes(item);
-    }
-
 }

src/main/java/net/knarcraft/blacksmith/util/ItemHelper.java

@@ -17,6 +17,16 @@ public final class ItemHelper {
 
     }
 
+    /**
+     * Gets whether the given item is repairable
+     *
+     * @param item <p>The item to check</p>
+     * @return <p>True if the item is repairable</p>
+     */
+    public static boolean isRepairable(ItemStack item) {
+        return item.getItemMeta() instanceof Damageable && EnchantmentTarget.BREAKABLE.includes(item);
+    }
+
     /**
      * Gets the max durability of an item
      *

src/main/java/net/knarcraft/blacksmith/util/SalvageHelper.java

@@ -1,8 +1,7 @@
 package net.knarcraft.blacksmith.util;
 
-import net.knarcraft.blacksmith.trait.BlacksmithTrait;
-import org.bukkit.Bukkit;
 import org.bukkit.Material;
+import org.bukkit.Server;
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.Recipe;
 import org.bukkit.inventory.ShapedRecipe;
@@ -24,17 +23,19 @@ public final class SalvageHelper {
      *
      * <p>Note: Only items craft-able in a crafting table are salvageable. Netherite gear is therefore not salvageable.</p>
      *
+     * @param server         <p>The server to get recipes from</p>
      * @param salvagedItem   <p>The item stack to salvage</p>
+     * @param ignoredSalvage <p>Any material which should not be returned as part of the salvage.</p>
      * @return <p>The items to return to the user, or null if not salvageable</p>
      */
-    public static List<ItemStack> getSalvage(ItemStack salvagedItem) {
+    public static List<ItemStack> getSalvage(Server server, ItemStack salvagedItem, List<Material> ignoredSalvage) {
         if (salvagedItem == null || salvagedItem.getAmount() < 1 ||
-                !BlacksmithTrait.isRepairable(salvagedItem)) {
+                !ItemHelper.isRepairable(salvagedItem)) {
             return null;
         }
 
-        for (Recipe recipe : Bukkit.getServer().getRecipesFor(salvagedItem)) {
-            List<ItemStack> salvage = getRecipeSalvage(recipe, salvagedItem);
+        for (Recipe recipe : server.getRecipesFor(salvagedItem)) {
+            List<ItemStack> salvage = getRecipeSalvage(recipe, salvagedItem, ignoredSalvage);
             if (salvage != null) {
                 return salvage;
             }
@@ -48,9 +49,11 @@ public final class SalvageHelper {
      *
      * @param recipe         <p>The recipe to get salvage for</p>
      * @param salvagedItem   <p>The item to be salvaged</p>
+     * @param ignoredSalvage <p>Any material which should not be returned as part of the salvage.</p>
      * @return <p>A list of items, or null if not a valid type of recipe</p>
      */
-    private static List<ItemStack> getRecipeSalvage(Recipe recipe, ItemStack salvagedItem) {
+    private static List<ItemStack> getRecipeSalvage(Recipe recipe, ItemStack salvagedItem,
+                                                    List<Material> ignoredSalvage) {
         List<ItemStack> ingredients;
         if (recipe instanceof ShapedRecipe shapedRecipe) {
             ingredients = getIngredients(shapedRecipe);
@@ -63,6 +66,11 @@ public final class SalvageHelper {
         //Make things easier by eliminating identical stacks
         ingredients = combineStacks(ingredients);
 
+        //Purge any ignored salvage to only calculate salvage using the remaining items
+        if (ignoredSalvage != null) {
+            ingredients.removeIf((item) -> ignoredSalvage.contains(item.getType()));
+        }
+
         //Make sure to give salvage for all items if a stack > 1 is provided
         List<ItemStack> salvage = new ArrayList<>();
         for (int i = 0; i < salvagedItem.getAmount(); i++) {

src/test/java/net/knarcraft/blacksmith/CustomServerMock.java

@@ -0,0 +1,31 @@
+package net.knarcraft.blacksmith;
+
+import be.seeseemelk.mockbukkit.ServerMock;
+import org.bukkit.Material;
+import org.bukkit.NamespacedKey;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.Recipe;
+import org.bukkit.inventory.ShapedRecipe;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A custom server mock specifically for making the SalvageHelperTest work
+ */
+public class CustomServerMock extends ServerMock {
+
+    public @NotNull List<Recipe> getRecipesFor(@NotNull ItemStack itemStack) {
+        List<Recipe> validRecipes = new ArrayList<>();
+        if (itemStack.getType() == Material.DIAMOND_PICKAXE) {
+            ShapedRecipe recipe = new ShapedRecipe(NamespacedKey.minecraft("diamond_pickaxe"), itemStack);
+            recipe.shape("ddd", "asa", "asa");
+            recipe.setIngredient('d', Material.DIAMOND);
+            recipe.setIngredient('s', Material.STICK);
+            validRecipes.add(recipe);
+        }
+        return validRecipes;
+    }
+
+}

src/test/java/net/knarcraft/blacksmith/util/SalvageHelperTest.java

@@ -0,0 +1,76 @@
+package net.knarcraft.blacksmith.util;
+
+import be.seeseemelk.mockbukkit.MockBukkit;
+import net.knarcraft.blacksmith.CustomServerMock;
+import org.bukkit.Material;
+import org.bukkit.Server;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.Damageable;
+import org.bukkit.inventory.meta.ItemMeta;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+/**
+ * A test class to test salvaging
+ */
+public class SalvageHelperTest {
+
+    private static Server server;
+
+    @BeforeAll
+    public static void setUp() {
+        server = MockBukkit.mock(new CustomServerMock());
+    }
+
+    @Test
+    public void getNullForInvalidItemTest() {
+        //Assert that a non-reforge-able item will return null
+        assertNull(SalvageHelper.getSalvage(server, new ItemStack(Material.POTATO, 1), null));
+    }
+
+    @Test
+    public void getNullForLessThanOneItemTest() {
+        //Assert that 0 or 1 items will return null
+        assertNull(SalvageHelper.getSalvage(server, new ItemStack(Material.IRON_AXE, 0), null));
+        assertNull(SalvageHelper.getSalvage(server, new ItemStack(Material.IRON_SWORD, -1), null));
+    }
+
+    @Test
+    public void getFullSalvageTest() {
+        Set<ItemStack> expectedSalvage = new HashSet<>();
+        expectedSalvage.add(new ItemStack(Material.DIAMOND, 3));
+        expectedSalvage.add(new ItemStack(Material.STICK, 2));
+        ItemStack itemToSalvage = new ItemStack(Material.DIAMOND_PICKAXE, 1);
+        //Note: Conversion to sets makes sure the order doesn't matter
+        assertEquals(expectedSalvage, new HashSet<>(SalvageHelper.getSalvage(server, itemToSalvage, null)));
+    }
+
+    @Test
+    public void getNonFullSalvageTest() {
+        List<ItemStack> expectedSalvage = new ArrayList<>();
+        expectedSalvage.add(new ItemStack(Material.DIAMOND, 3));
+        expectedSalvage.add(new ItemStack(Material.STICK, 2));
+        ItemStack itemToSalvage = new ItemStack(Material.DIAMOND_PICKAXE, 1);
+        ItemMeta meta = itemToSalvage.getItemMeta();
+        Damageable damageable = (Damageable) meta;
+        if (damageable != null) {
+            damageable.setDamage(100);
+        }
+        itemToSalvage.setItemMeta(meta);
+        List<ItemStack> salvage = SalvageHelper.getSalvage(server, itemToSalvage, null);
+        //Assert that some items are given
+        assertNotEquals(salvage, new ArrayList<>());
+        //Assert that a damaged item won't give full salvage
+        assertNotEquals(expectedSalvage, salvage);
+    }
+
+}