In testing, how do I get an attribute using XPath?

Question

In Drupal BrowserTestBase, I am trying to access an attribute value using XPath:

$query = $this->xpath('//a[text() = "View"]/@data-drupal-link-system-path');

I can't figure out any way to get the actual value.

$path = $query[0]->value;

Results in error message: Undefined property: Behat\Mink\Element\NodeElement::$value

$path = $query[0]->getValue();

Results in error message: Error: Call to undefined method DOMAttr::hasAttribute()

$path = $query[0]->getAttribute('data-drupal-link-system-path');

Results in error message: Error: Call to undefined method DOMAttr::hasAttribute()

The following works, but isn't the XPath I want to use:

$query = $this->xpath('//a[text() = "View"]');
$path = $query[0]->getAttribute('data-drupal-link-system-path');

Is there any way to get at the value of an attribute from an XPath attribute query?