hamcrest - how to negate hasXPath to test document does not contain certain child node?

Question

I want to test that some XML document does not contain certain XPath, how should I assert that in unit test using Hamcrest matcher?

For example I want to assert the document has no foo/bar under pos:

    assertThat(document, Matchers.hasXPath(
            "/svc_result/slia/pos/foo/bar)]")  # negate here
    );

Answer 1

We should use XPath negate, as Hamcrest does not support matcher negation:

    assertThat(document, Matchers.hasXPath(
            "/svc_result/slia/pos[not(foo/bar)]")
    );

parent[not(xxx)] means "this XPath parent does not contain a child node xxx".