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core/tests/Drupal/FunctionalJavascriptTests/JavascriptDeprecationTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\FunctionalJavascriptTests;
+
+/**
+ * Tests Javascript deprecation notices.
+ *
+ * @group javascript
+ * @group legacy
+ */
+class JavascriptDeprecationTest extends WebDriverTestBase {
+
+  protected static $modules = ['js_deprecation_test'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'stark';
+
+  /**
+   * Tests Javascript deprecation notices.
+   */
+  public function testJavascriptDeprecation(): void {
+    $this->expectDeprecation('Javascript Deprecation: This function is deprecated for testing purposes.');
+    $this->expectDeprecation('Javascript Deprecation: This property is deprecated for testing purposes.');
+    $this->drupalGet('js_deprecation_test');
+    // Ensure that deprecation message from previous page loads will be
+    // detected.
+    $this->drupalGet('user');
+  }
+
+}