diff --git a/tests/DynamicReturnTypeExtensionTest.php b/tests/DynamicReturnTypeExtensionTest.php
index 4422afe..ef2d81d 100644
--- a/tests/DynamicReturnTypeExtensionTest.php
+++ b/tests/DynamicReturnTypeExtensionTest.php
@@ -14,6 +14,7 @@ public function dataFileAsserts(): iterable
         // Path to a file with actual asserts of expected types:
         yield from self::gatherAssertTypes(__DIR__ . '/data/_get_list_table.php');
         yield from self::gatherAssertTypes(__DIR__ . '/data/apply_filters.php');
+        yield from self::gatherAssertTypes(__DIR__ . '/data/ApplyFiltersTestClass.php');
         yield from self::gatherAssertTypes(__DIR__ . '/data/current_time.php');
         yield from self::gatherAssertTypes(__DIR__ . '/data/echo_key.php');
         yield from self::gatherAssertTypes(__DIR__ . '/data/echo_parameter.php');