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core/tests/Drupal/Tests/ExpectDeprecationTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ExpectDeprecationTrait;
+
+/**
+ * Ensures Drupal has test coverage of Symfony's deprecation testing.
+ *
+ * @group Test
+ * @group legacy
+ */
+class ExpectDeprecationTest extends TestCase {
+  use ExpectDeprecationTrait;
+
+  /**
+   * Tests expectDeprecation.
+   */
+  public function testExpectDeprecation(): void {
+    $this->expectDeprecation('Test deprecation');
+    // phpcs:ignore Drupal.Semantics.FunctionTriggerError
+    @trigger_error('Test deprecation', E_USER_DEPRECATED);
+  }
+
+  /**
+   * Tests expectDeprecation in isolated test.
+   *
+   * @runInSeparateProcess
+   * @preserveGlobalState disabled
+   */
+  public function testExpectDeprecationInIsolation(): void {
+    $this->expectDeprecation('Test isolated deprecation');
+    // phpcs:ignore Drupal.Semantics.FunctionTriggerError
+    @trigger_error('Test isolated deprecation', E_USER_DEPRECATED);
+  }
+
+}