Converter tests:

Change test data files extension to "java"

j2k/tests/testData/ast/newClassExpression/newClassByFullName.java

@@ -0,0 +1,11 @@
+//file
+package org.test
+
+class Library {}
+}
+
+class User {
+  void main() {
+    Library lib = new Library();
+  }
+}