Fix issues with Recipe API

paper-server/src/test/java/io/papermc/paper/inventory/recipe/TestRecipeChoice.java

@@ -0,0 +1,25 @@
+package io.papermc.paper.inventory.recipe;
+
+import java.util.Iterator;
+import org.bukkit.Bukkit;
+import org.bukkit.inventory.Recipe;
+import org.bukkit.support.environment.AllFeatures;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+@AllFeatures
+class TestRecipeChoice {
+
+    @Test
+    void testRecipeChoices() {
+        final Iterator<Recipe> iter = Bukkit.recipeIterator();
+        boolean foundRecipes = false;
+        while (iter.hasNext()) {
+            foundRecipes = true;
+            assertDoesNotThrow(iter::next, "Failed to convert a recipe to Bukkit recipe!");
+        }
+        assertTrue(foundRecipes, "No recipes found!");
+    }
+}

paper-server/src/test/java/org/bukkit/support/DummyServerHelper.java

@@ -92,6 +92,15 @@ public final class DummyServerHelper {
         // Paper end - testing additions
 
         io.papermc.paper.configuration.GlobalConfigTestingBase.setupGlobalConfigForTest(); // Paper - configuration files - setup global configuration test base
+
+        // Paper start - add test for recipe conversion
+        when(instance.recipeIterator()).thenAnswer(ignored ->
+            com.google.common.collect.Iterators.transform(
+                RegistryHelper.getDataPack().getRecipeManager().recipes.byType.entries().iterator(),
+                input -> input.getValue().toBukkitRecipe()
+            )
+        );
+        // Paper end - add test for recipe conversion
         return instance;
     }
 }