added prop patch handle multiple remaining test

tests/Sabre/DAV/PropPatchTest.php

@@ -121,6 +121,36 @@ public function testHandleRemaining()
         self::assertTrue($hasRan);
     }
 
+    public function testHandleMultipleRemaining()
+    {
+        $hasRan = false;
+
+        $this->propPatch = new PropPatch([
+            '{DAV:}displayname' => 'foo',
+            'unittest' => 'bar',
+        ]);
+
+        $this->propPatch->handleRemaining(function ($mutations) use (&$hasRan) {
+            static $numberOfCalls = 0;
+
+            self::assertCount(2, $mutations);
+            self::assertLessThan(2, ++$numberOfCalls);
+
+            $hasRan = true;
+
+            return true;
+        });
+
+        self::assertTrue($this->propPatch->commit());
+        $result = $this->propPatch->getResult();
+        self::assertEquals([
+            '{DAV:}displayname' => 200,
+            'unittest' => 200,
+        ], $result);
+
+        self::assertTrue($hasRan);
+    }
+
     public function testHandleRemainingNothingToDo()
     {
         $hasRan = false;