diff --git a/tools/dtoc/test_fdt.py b/tools/dtoc/test_fdt.py
index 375e906..b4f9b7f 100755
--- a/tools/dtoc/test_fdt.py
+++ b/tools/dtoc/test_fdt.py
@@ -417,6 +417,10 @@
         self.node.SetData('empty', b'123')
         self.assertEqual(b'123', prop.bytes)
 
+        # Trying adding a lot of data at once
+        self.node.AddData('data', tools.GetBytes(65, 20000))
+        self.dtb.Sync(auto_resize=True)
+
     def testFromData(self):
         dtb2 = fdt.Fdt.FromData(self.dtb.GetContents())
         self.assertEqual(dtb2.GetContents(), self.dtb.GetContents())