Set tolerance to 0 during tests

tests/src/Kernel/MemcacheBackendTest.php

@@ -2,6 +2,8 @@
 
 namespace Drupal\Tests\memcache\Kernel;
 
+use Drupal\Core\DependencyInjection\ContainerBuilder;
+use Drupal\Core\DependencyInjection\ServiceModifierInterface;
 use Drupal\KernelTests\Core\Cache\GenericCacheBackendUnitTestBase;
 use Drupal\memcache\MemcacheBackendFactory;
 
@@ -10,7 +12,7 @@ use Drupal\memcache\MemcacheBackendFactory;
  *
  * @group memcache
  */
-class MemcacheBackendTest extends GenericCacheBackendUnitTestBase {
+class MemcacheBackendTest extends GenericCacheBackendUnitTestBase implements ServiceModifierInterface {
 
   /**
    * Modules to enable.
@@ -19,6 +21,15 @@ class MemcacheBackendTest extends GenericCacheBackendUnitTestBase {
    */
   public static $modules = ['system', 'memcache'];
 
+  /**
+   * {@inheritdoc}
+   */
+  public function alter(ContainerBuilder $container) {
+    $service_definition = $container->getDefinition('memcache.timestamp.invalidator.bin');
+    // Set tolerance to 0 for timestamp invalidator.
+    $service_definition->setArgument(2, 0);
+  }
+
   /**
    * Creates a new instance of DatabaseBackend.
    *