reorganize classes so test data is separate from test cases

src/test/java/org/json/junit/data/MyEnum.java

@@ -0,0 +1,10 @@
+package org.json.junit.data;
+
+/**
+ * An enum with no methods or data
+ */
+public enum MyEnum {
+    VAL1,
+    VAL2,
+    VAL3;
+}