Added test suite for item module not provided

Author: fulminazzo

wrappers/bukkit/src/test/java/it/angrybear/yagl/WrappersAdapterTest.java

@@ -26,8 +26,10 @@
 import org.junit.jupiter.params.provider.EnumSource;
 import org.junit.jupiter.params.provider.MethodSource;
 import org.mockito.ArgumentCaptor;
+import org.mockito.MockedStatic;
 
 import java.lang.reflect.Field;
+import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
@@ -389,6 +391,21 @@ void testInvalidDataType() {
         assertThrowsExactly(IllegalArgumentException.class, () -> WrappersAdapter.convertOption(MockDataType.class, "String"));
     }
 
+    @Test
+    void testItemModuleNotProvided() {
+        try (MockedStatic<WrappersAdapter> clazz = mockStatic(WrappersAdapter.class)) {
+            clazz.when(() -> {
+                Method method = WrappersAdapter.class.getDeclaredMethod("getItemUtils");
+                ReflectionUtils.setAccessible(method).invoke(WrappersAdapter.class);
+            }).thenReturn(null);
+            clazz.when(() -> WrappersAdapter.itemToItemStack(any())).thenCallRealMethod();
+
+            assertThrowsExactly(IllegalStateException.class, () -> WrappersAdapter.itemToItemStack(null),
+                    "Expected exception to be thrown signaling missing item module, but nothing was thrown");
+
+        }
+    }
+
     private static void initializeBlockData() {
         Server server = mock(Server.class);
         when(server.createBlockData(any(Material.class), any(String.class))).thenReturn(mock(BlockData.class));