public function assertJunitXmlIsCorrect($path)
{
$doc = simplexml_load_file($path);
$suites = $doc->xpath('//testsuite');
$cases = $doc->xpath('//testcase');
$failures = $doc->xpath('//failure');
$errors = $doc->xpath('//error');
// these numbers represent the tests in fixtures/failing-tests
// so will need to be updated when tests are added or removed
$this->assertCount(6, $suites);
$this->assertCount(16, $cases);
$this->assertCount(6, $failures);
$this->assertCount(1, $errors);
}