Issue #2504211 by mpdonadio: DateFormatter::formatDiff() ignore granularity in some circumstances

core/lib/Drupal/Core/Datetime/DateFormatter.php

@@ -401,7 +401,7 @@ public function formatDiff($from, $to, $options = array()) {
         $granularity--;
       }
 
-      if ($granularity == 0) {
+      if ($granularity <= 0) {
         break;
       }
     }

core/tests/Drupal/Tests/Core/Datetime/DateTest.php

@@ -376,6 +376,9 @@ public function providerTestFormatDiff() {
       // Checks the non-strict option vs. strict (default).
       array('1 second', $this->createTimestamp('2013-12-11 10:09:08'), $this->createTimestamp('2013-12-11 10:09:07'), $non_strict),
       array('0 seconds', $this->createTimestamp('2013-12-11 10:09:08'), $this->createTimestamp('2013-12-11 10:09:07')),
+
+      // Checks granularity limit.
+      array('2 years 3 months 1 week', $this->createTimestamp('2011-08-30 11:15:57'), $request_time, $granularity_3),
     );
 
     return $data;