How to check value as number?

Question

Java

I am writing a rest test. Rest returns xml, in one of the elements of which the value has a numeric form.
How can I check that this number is non-zero? I'm trying to defeat this issue with org.hamcrest.xml.HasXPath.hasXPath and org.hamcrest.Matchers.greaterThan, but nothing comes out yet. I need an example, but I did not find anything suitable by Google.

Answer 1

Here is a piece of working code

@Test
    public void myTest() throws Exception {

        final HttpURLConnection urlConnection = getConnection(HOST_URL + MY_URL);

        prepareConnection(urlConnection);
        urlConnection.setRequestMethod("POST");

        BufferedReader br = new BufferedReader(new InputStreamReader((urlConnection.getInputStream())));
        StringBuilder sb = new StringBuilder();
        String output;
        while ((output = br.readLine()) != null) {
            sb.append(output);
        }

        assertThat("Incorrect fields or values in the response xml.", parse(sb.toString()), hasXPath("ParentNode/ChildNode", containsString("42")));

    }

But I need to check that ChildNode has a non-zero number and not a string that has "42" in it. There is an org.hamcrest.Matchers.greaterThan matcher for this, but the problem is that it can't be used here.