Converter tests:

Change test data files extension to "java"

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

@@ -0,0 +1,9 @@
+//file
+import java.util.List;
+import java.util.LinkedList;
+
+class User {
+  void main() {
+    List<String> list = new LinkedList<String>();
+  }
+}