composer update

web/core/tests/Drupal/Tests/WebAssert.php

@@ -3,6 +3,7 @@
 namespace Drupal\Tests;
 
 use Behat\Mink\Exception\ExpectationException;
+use Behat\Mink\Exception\ResponseTextException;
 use Behat\Mink\WebAssert as MinkWebAssert;
 use Behat\Mink\Element\TraversableElement;
 use Behat\Mink\Exception\ElementNotFoundException;
@@ -545,4 +546,31 @@ class WebAssert extends MinkWebAssert {
     $this->assert(!preg_match($regex, $actual), $message);
   }
 
+  /**
+   * Checks that current page contains text only once.
+   *
+   * @param string $text
+   *   The string to look for.
+   *
+   * @see \Behat\Mink\WebAssert::pageTextContains()
+   */
+  public function pageTextContainsOnce($text) {
+    $actual = $this->session->getPage()->getText();
+    $actual = preg_replace('/\s+/u', ' ', $actual);
+    $regex = '/' . preg_quote($text, '/') . '/ui';
+    $count = preg_match_all($regex, $actual);
+    if ($count === 1) {
+      return;
+    }
+
+    if ($count > 1) {
+      $message = sprintf('The text "%s" appears in the text of this page more than once, but it should not.', $text);
+    }
+    else {
+      $message = sprintf('The text "%s" was not found anywhere in the text of the current page.', $text);
+    }
+
+    throw new ResponseTextException($message, $this->session->getDriver());
+  }
+
 }