Add some testing

By: Erik Broes <erikbroes@grum.nl>

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

@@ -0,0 +1,21 @@
+package org.bukkit.support;
+
+import net.minecraft.server.StatisticList;
+
+import org.junit.BeforeClass;
+
+/**
+ *  If you are getting: java.lang.ExceptionInInitializerError
+ *    at net.minecraft.server.StatisticList.<clinit>(SourceFile:58)
+ *    at net.minecraft.server.Item.<clinit>(SourceFile:252)
+ *    at net.minecraft.server.Block.<clinit>(Block.java:577)
+ *
+ *  extend this class to solve it.
+ */
+public abstract class AbstractTestingBase {
+
+    @BeforeClass
+    public static void setup() {
+        StatisticList.a();
+    }
+}

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

@@ -0,0 +1,31 @@
+package org.bukkit.support;
+
+import java.lang.reflect.Field;
+
+public class Util {
+    /*
+    public static <T> T getInternalState(Object object, String fieldName) {
+        return getInternalState(object.getClass(), object, fieldName);
+    }
+    */
+
+    @SuppressWarnings("unchecked")
+    public static <T> T getInternalState(Class<?> clazz, Object object, String fieldName) {
+        Field field;
+        try {
+            field = clazz.getDeclaredField(fieldName);
+        } catch (SecurityException e) {
+            throw new RuntimeException("Not allowed to access " + clazz, e);
+        } catch (NoSuchFieldException e) {
+            throw new RuntimeException("Unable to find field " + fieldName, e);
+        }
+
+        field.setAccessible(true);
+        try {
+            return (T) field.get(object);
+        } catch (IllegalArgumentException e) {
+        } catch (IllegalAccessException e) {
+        }
+        throw new RuntimeException("Unable to get internal value");
+    }
+}