Converter tests:

Change test data files extension to "java"

j2k/tests/testData/ast/enum/fieldsWithPrimaryPrivateConstructor.java

@@ -0,0 +1,13 @@
+//class
+enum Color {
+  WHITE(21), BLACK(22), RED(23), YELLOW(24), BLUE(25);
+
+  private int code;
+
+  private Color(int c) {
+    code = c;
+  }
+
+  public int getCode() {
+    return code;
+  }