Add test for WorldType's

src/test/java/org/bukkit/WorldTypeTest.java

@@ -0,0 +1,31 @@
+package org.bukkit;
+
+import static org.junit.Assert.fail;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import net.minecraft.server.WorldType;
+import org.junit.Test;
+
+public class WorldTypeTest {
+    @Test
+    public void testTypes() {
+        List<WorldType> missingTypes = new ArrayList<WorldType>();
+
+        for (WorldType type : WorldType.types) {
+            if (type == null) continue;
+
+            if (org.bukkit.WorldType.getByName(type.name()) == null) {
+                missingTypes.add(type);
+            }
+        }
+
+        if (!missingTypes.isEmpty()) {
+            for (WorldType type : missingTypes) {
+                System.out.println(type.name() + " is missing!");
+            }
+            fail("Missing (" + missingTypes.size() + ") WorldTypes!");
+        }
+    }
+}