diff --git a/core/modules/block/tests/src/Functional/AssertBlockAppearsTrait.php b/core/modules/block/tests/src/Functional/AssertBlockAppearsTrait.php
new file mode 100644
index 0000000..17244ff
--- /dev/null
+++ b/core/modules/block/tests/src/Functional/AssertBlockAppearsTrait.php
@@ -0,0 +1,50 @@
+<?php
+
+namespace Drupal\Tests\block\Functional;
+
+use Drupal\block\Entity\Block;
+use Drupal\Component\Render\FormattableMarkup;
+
+/**
+ * Provides test assertions for testing block appearance.
+ *
+ * Can be used by test classes that extend \Drupal\Tests\BrowserTestBase.
+ */
+trait AssertBlockAppearsTrait {
+
+  /**
+   * Checks to see whether a block appears on the page.
+   *
+   * @param \Drupal\block\Entity\Block $block
+   *   The block entity to find on the page.
+   */
+  protected function assertBlockAppears(Block $block) {
+    $result = $this->findBlockInstance($block);
+    $this->assertTrue(!empty($result), new FormattableMarkup('Ensure the block @id appears on the page', ['@id' => $block->id()]));
+  }
+
+  /**
+   * Checks to see whether a block does not appears on the page.
+   *
+   * @param \Drupal\block\Entity\Block $block
+   *   The block entity to find on the page.
+   */
+  protected function assertNoBlockAppears(Block $block) {
+    $result = $this->findBlockInstance($block);
+    $this->assertFalse(!empty($result), new FormattableMarkup('Ensure the block @id does not appear on the page', ['@id' => $block->id()]));
+  }
+
+  /**
+   * Find a block instance on the page.
+   *
+   * @param \Drupal\block\Entity\Block $block
+   *   The block entity to find on the page.
+   *
+   * @return array
+   *   The result from the xpath query.
+   */
+  protected function findBlockInstance(Block $block) {
+    return $this->xpath('//div[@id = :id]', [':id' => 'block-' . $block->id()]);
+  }
+
+}
diff --git a/core/modules/shortcut/tests/src/Functional/ShortcutLinksTest.php b/core/modules/shortcut/tests/src/Functional/ShortcutLinksTest.php
index d31eaf9..e39f652 100644
--- a/core/modules/shortcut/tests/src/Functional/ShortcutLinksTest.php
+++ b/core/modules/shortcut/tests/src/Functional/ShortcutLinksTest.php
@@ -8,6 +8,7 @@
 use Drupal\Core\Url;
 use Drupal\shortcut\Entity\Shortcut;
 use Drupal\shortcut\Entity\ShortcutSet;
+use Drupal\Tests\block\Functional\AssertBlockAppearsTrait;
 use Drupal\views\Entity\View;
 
 /**
@@ -17,6 +18,8 @@
  */
 class ShortcutLinksTest extends ShortcutTestBase {
 
+  use AssertBlockAppearsTrait;
+
   /**
    * Modules to enable.
    *
diff --git a/core/tests/Drupal/FunctionalTests/AssertLegacyTrait.php b/core/tests/Drupal/FunctionalTests/AssertLegacyTrait.php
index 4bcd1a4..d11ef76 100644
--- a/core/tests/Drupal/FunctionalTests/AssertLegacyTrait.php
+++ b/core/tests/Drupal/FunctionalTests/AssertLegacyTrait.php
@@ -4,7 +4,6 @@
 
 use Behat\Mink\Exception\ExpectationException;
 use Behat\Mink\Selector\Xpath\Escaper;
-use Drupal\block\Entity\Block;
 use Drupal\Component\Render\FormattableMarkup;
 use Drupal\Component\Utility\Xss;
 use Drupal\KernelTests\AssertLegacyTrait as BaseAssertLegacyTrait;
@@ -813,52 +812,4 @@ protected function getRawContent() {
     return $this->getSession()->getPage()->getContent();
   }
 
-  /**
-   * Checks to see whether a block appears on the page.
-   *
-   * @param \Drupal\block\Entity\Block $block
-   *   The block entity to find on the page.
-   *
-   * @deprecated Scheduled for removal in Drupal 9.0.0.
-   *   Use $this->xpath() instead and assert that the result is not empty.
-   */
-  protected function assertBlockAppears(Block $block) {
-    @trigger_error('AssertLegacyTrait::assertBlockAppears() is scheduled for removal in Drupal 9.0.0. Use $this->xpath() instead and assert that the result is not empty.', E_USER_DEPRECATED);
-    $result = $this->findBlockInstance($block);
-    $this->assertTrue(!empty($result), format_string('Ensure the block @id appears on the page', ['@id' => $block->id()]));
-  }
-
-  /**
-   * Checks to see whether a block does not appears on the page.
-   *
-   * @param \Drupal\block\Entity\Block $block
-   *   The block entity to find on the page.
-   *
-   * @deprecated Scheduled for removal in Drupal 9.0.0.
-   *   Use $this->xpath() instead and assert that the result is empty.
-   */
-  protected function assertNoBlockAppears(Block $block) {
-    @trigger_error('AssertLegacyTrait::assertNoBlockAppears() is scheduled for removal in Drupal 9.0.0. Use $this->xpath() instead and assert that the result is empty.', E_USER_DEPRECATED);
-    $result = $this->findBlockInstance($block);
-    $this->assertFalse(!empty($result), format_string('Ensure the block @id does not appear on the page', ['@id' => $block->id()]));
-  }
-
-  /**
-   * Find a block instance on the page.
-   *
-   * @param \Drupal\block\Entity\Block $block
-   *   The block entity to find on the page.
-   *
-   * @return array
-   *   The result from the xpath query.
-   *
-   * @deprecated Scheduled for removal in Drupal 9.0.0.
-   *   Use $this->xpath('//div[@id = :id]', [':id' => 'block-' . $block->id()])
-   *   instead.
-   */
-  protected function findBlockInstance(Block $block) {
-    @trigger_error('AssertLegacyTrait::findBlockInstance() is scheduled for removal in Drupal 9.0.0. Use $this->xpath(\'//div[@id = :id]\', [\':id\' => \'block-\' . $block->id()]) instead.', E_USER_DEPRECATED);
-    return $this->xpath('//div[@id = :id]', [':id' => 'block-' . $block->id()]);
-  }
-
 }