diff --git a/tests/dfu_test.py b/tests/dfu_test.py
new file mode 100644
index 000000000..63862f602
--- /dev/null
+++ b/tests/dfu_test.py
@@ -0,0 +1,22 @@
+# We want to test a bunch of addresses and sizes
+
+import os
+
+def random_write(flash_offset, length):
+  flash_base_address = 0x08000000
+  os.system("head -c %d /dev/urandom > data.bin" % length)
+  os.system("dfu-util -i 0 -a 0 -s 0x%x -D data.bin > /dev/null 2>&1" % (flash_base_address + flash_offset))
+  os.system("rm result.bin")
+  os.system("dfu-util -i 0 -a 0 -s 0x%x:%d -U result.bin > /dev/null 2>&1" % (flash_base_address, flash_offset + length + 100))
+  data = open('data.bin', 'rb').read()
+  result = open('result.bin', 'rb').read()
+  theoretical_result = "\xFF"*flash_offset + data + "\xFF"*100
+  return (result == theoretical_result)
+
+pairs = [(0,1), (5,2), (37,33), (211,2719), (0x4000-5, 17)]
+# The last test crosses sector boundaries
+for (offset,length) in pairs:
+  if not random_write(offset, length):
+    print("[ERROR] Write %d bytes at offset 0x%x" % (length, offset))
+  else:
+    print("[OK] Write %d bytes at offset 0x%x" % (length, offset))