Osvaldo Villarroel Marañon
--- a/core/tests/Drupal/Tests/Core/Database/ConnectionTest.php
+++ b/core/tests/Drupal/Tests/Core/Database/ConnectionTest.php
    $this->assertInstanceOf(StatementPrefetch::class, $statement);
  }

+  /**
+   * Trying a non string value as prefix.
+   */
+  public function testNonStringPrefix() {
-  public function testNonStringPrefix() {
+  public function testNonStringPrefix(): void {