assertEquals(PrefixQuery.class, query.getClass());
        assertEquals("_default:fess", ((PrefixQuery) query).getPrefix().toString());

        query = queryParser.createDefaultFilterChain().parse("fe?s");
        assertEquals(WildcardQuery.class, query.getClass());
        assertEquals("_default:fe?s", ((WildcardQuery) query).getTerm().toString());

        query = queryParser.createDefaultFilterChain().parse("fess~");

   *    /
   *   b   e <----> f
   *  / \ /
   * c   d
   * }
   */
  private static final SuccessorsFunction<Character> CYCLIC_GRAPH_CONTAINING_TREE =
      createDirectedGraph("ab", "bc", "bd", "ed", "ef", "fe");

  /**
   * A graph that is not a tree (for example, {@code h} is reachable from {@code f} via both {@code
   * e} and {@code g}) but is a valid input to {@link Traverser#forTree} when starting e.g. at node

   *    /
   *   b   e <----> f
   *  / \ /
   * c   d
   * }
   */
  private static final SuccessorsFunction<Character> CYCLIC_GRAPH_CONTAINING_TREE =
      createDirectedGraph("ab", "bc", "bd", "ed", "ef", "fe");

  /**
   * A graph that is not a tree (for example, {@code h} is reachable from {@code f} via both {@code
   * e} and {@code g}) but is a valid input to {@link Traverser#forTree} when starting e.g. at node

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