diff --git a/tests/DataObjectSetTest.php b/tests/DataObjectSetTest.php
index 0fc24f9f2..bf1481306 100644
--- a/tests/DataObjectSetTest.php
+++ b/tests/DataObjectSetTest.php
@@ -121,6 +121,22 @@ class DataObjectSetTest extends SapphireTest {
 		$this->assertFalse($commArr[4]->IsMultipleOf3);
 		$this->assertFalse($commArr[5]->IsMultipleOf3);
 		$this->assertTrue($commArr[6]->IsMultipleOf3);
+
+		foreach($comments as $comment) {
+			if($comment->MultipleOf(3, 1)) {
+				$comment->IsMultipleOf3 = true;
+			} else {
+				$comment->IsMultipleOf3 = false;
+			}
+		}
+
+		$this->assertFalse($commArr[0]->IsMultipleOf3);
+		$this->assertFalse($commArr[1]->IsMultipleOf3);
+		$this->assertTrue($commArr[2]->IsMultipleOf3);
+		$this->assertFalse($commArr[3]->IsMultipleOf3);
+		$this->assertFalse($commArr[4]->IsMultipleOf3);
+		$this->assertTrue($commArr[5]->IsMultipleOf3);
+		$this->assertFalse($commArr[6]->IsMultipleOf3);
 	}
 
 	/**