diff --git a/tests/phpunit/base_testcase.php b/tests/phpunit/base_testcase.php
index 0e71ed1..307a0c4 100644
--- a/tests/phpunit/base_testcase.php
+++ b/tests/phpunit/base_testcase.php
@@ -31,6 +31,8 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+use auth_outage\dml\outagedb;
+
 defined('MOODLE_INTERNAL') || die();
 
 /**
@@ -70,4 +72,12 @@ abstract class auth_outage_base_testcase extends advanced_testcase {
         parent::setUp();
         $this->resetAfterTest(true);
     }
+
+    public function tearDown() {
+        global $DB;
+
+        foreach (outagedb::get_all() as $i => $outage) {
+            $DB->delete_records('auth_outage', ['id' => $outage->id]);
+        }
+    }
 }
diff --git a/tests/phpunit/local/outagelib_test.php b/tests/phpunit/local/outagelib_test.php
index 0e04866..6fd2875 100644
--- a/tests/phpunit/local/outagelib_test.php
+++ b/tests/phpunit/local/outagelib_test.php
@@ -31,6 +31,7 @@ defined('MOODLE_INTERNAL') || die();
 
 global $CFG;
 require_once($CFG->libdir.'/adminlib.php');
+require_once(__DIR__.'/../base_testcase.php');
 
 /**
  * outagelib_test test class.
@@ -41,7 +42,7 @@ require_once($CFG->libdir.'/adminlib.php');
  * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  * @SuppressWarnings(public) Allow as many methods as needed.
  */
-class outagelib_test extends advanced_testcase {
+class outagelib_test extends auth_outage_base_testcase {
     /**
      * Check if maintenance message is disabled as needed.
      */