diff --git a/core/modules/simpletest/tests/src/Functional/DeprecationTest.php b/core/modules/simpletest/tests/src/Functional/DeprecationTest.php
deleted file mode 100644
index 94af53b79c..0000000000
--- a/core/modules/simpletest/tests/src/Functional/DeprecationTest.php
+++ /dev/null
@@ -1,13 +0,0 @@
-<?php
-
-namespace Drupal\Tests\simpletest\Functional;
-
-@trigger_error('Do not use me, thanks!', E_USER_DEPRECATED);
-
-/**
- * Provides deprecated test for check unexpected deprecated error.
- *
- * @deprecated for tests deprecated trigger_error.
- */
-trait DeprecationTest {
-}
diff --git a/core/modules/simpletest/tests/src/Functional/TestDiscoveryTest.php b/core/modules/simpletest/tests/src/Functional/TestDiscoveryTest.php
index 3775b98f67..6c5dd35cd2 100644
--- a/core/modules/simpletest/tests/src/Functional/TestDiscoveryTest.php
+++ b/core/modules/simpletest/tests/src/Functional/TestDiscoveryTest.php
@@ -16,19 +16,12 @@ class TestDiscoveryTest extends BrowserTestBase {
    */
   public static $modules = ['simpletest'];
 
-  /**
-   * {@inheritdoc}
-   */
-  protected $profile = 'minimal';
-
   /**
    * Tests get list tests without deprecated fails.
    */
   public function testGetTestClasses() {
     $this->drupalLogin($this->drupalCreateUser(['administer unit tests']));
     $this->drupalGet('admin/config/development/testing');
-    // Assert that deprecated classes have been received.
-    $this->assertSession()->responseContains('Drupal\\Tests\\simpletest\\Functional\\DeprecationTest');
   }
 
 }
diff --git a/core/modules/simpletest/tests/src/Traits/TestTraitDeprecationTrait.php b/core/modules/simpletest/tests/src/Traits/TestTraitDeprecationTrait.php
new file mode 100644
index 0000000000..e47209e092
--- /dev/null
+++ b/core/modules/simpletest/tests/src/Traits/TestTraitDeprecationTrait.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace Drupal\Tests\simpletest\Traits;
+
+@trigger_error('Do not use me. And do not remove me. Thanks!', E_USER_DEPRECATED);
+
+/**
+ * Provides dummy deprecated trait for check unexpected deprecated error.
+ *
+ * @deprecated for tests deprecated trigger_error.
+ */
+trait TestTraitDeprecationTrait {
+}