diff --git a/tests/unit/Codeception/Module/RestTest.php b/tests/unit/Codeception/Module/RestTest.php
index 20ded87..fe19509 100644
--- a/tests/unit/Codeception/Module/RestTest.php
+++ b/tests/unit/Codeception/Module/RestTest.php
@@ -664,6 +664,7 @@ public function testRestExecute(string $configUrl, string $requestUrl, string $e
                     $content
                 ) use ($expectedFullUrl) {
                     \PHPUnit\Framework\Assert::assertSame($expectedFullUrl, $uri);
+                    return '';
                 })
             );