Converter tests:

Change test data files extension to "java"

j2k/tests/testData/ast/superExpression/classAextendsB.java

@@ -0,0 +1,13 @@
+//class
+class B {
+  B(int i) {}
+  int call() {return 1;}
+}
+
+class A extends B {
+  A() {
+    super(10);
+  }
+
+  int call() { return super.call(); }
+}