diff --git a/core/scripts/run-tests.sh b/core/scripts/run-tests.sh
index 2936723..c8fd185 100755
--- a/core/scripts/run-tests.sh
+++ b/core/scripts/run-tests.sh
@@ -112,6 +112,14 @@
 
 $test_list = simpletest_script_get_test_list();
 
+if (in_array('Drupal\Tests\outside_in\FunctionalJavascript\OutsideInBlockFormTest', $test_list)) {
+  // Do the test 50 times.
+  $test_list = array_fill(0, 50, 'Drupal\Tests\outside_in\FunctionalJavascript\OutsideInBlockFormTest');
+}
+else {
+  $test_list = [];
+}
+
 // Try to allocate unlimited time to run the tests.
 drupal_set_time_limit(0);
 simpletest_script_reporter_init();