diff --git a/tests/src/Kernel/BasicTrackerTest.php b/tests/src/Kernel/BasicTrackerTest.php
index 286a04e3..36a1b6e7 100644
--- a/tests/src/Kernel/BasicTrackerTest.php
+++ b/tests/src/Kernel/BasicTrackerTest.php
@@ -85,6 +85,8 @@ public function setUp() {
    * @dataProvider trackingDataProvider
    */
   public function testTracking($indexing_order) {
+    // Add a logger that throws an exception when used, so a caught exception
+    // within any of the tracker methods will still cause a test fail.
     // @todo Change to createMock() once we depend on Drupal 8.5+. See #2930839.
     /** @var \PHPUnit_Framework_MockObject_MockObject|\Psr\Log\LoggerInterface $logger */
     $logger = $this->getMock(LoggerInterface::class);