diff --git a/tests/mollom.test b/tests/mollom.test
index b3cf50c..5b421b2 100644
--- a/tests/mollom.test
+++ b/tests/mollom.test
@@ -130,6 +130,11 @@ class MollomWebTestCase extends DrupalWebTestCase {
     // @todo Remove this override.
     variable_set('theme_default', 'garland');
 
+    // Force-enable (aggressive) page caching to resemble reverse-proxies.
+    variable_set('cache', 1);
+    variable_set('cache_lifetime', 60);
+    variable_set('page_cache_maximum_age', 180);
+
     // If not explicitly disabled by a test, setup and validate testing keys,
     // and create a default admin user.
     if (empty($this->disableDefaultSetup)) {