test/pybind/test_rados.py: add test for reversed arguments offset,length in WriteOp.zero

Before the fix, zero(0, 2) would have no effect, and read would get '12345' instead of the expected '\x00\x00345'.

Signed-off-by: Wang Chao <[email protected]>

Author: Sean10

src/test/pybind/test_rados.py

@@ -515,6 +515,11 @@ def test_write_ops(self):
             self.ioctx.operate_write_op(write_op, "write_ops")
             eq(self.ioctx.read('write_ops'), b'12\x00\x005')
 
+            write_op.write_full(b'12345')
+            write_op.zero(0, 2)
+            self.ioctx.operate_write_op(write_op, "write_ops")
+            eq(self.ioctx.read('write_ops'), b'\x00\x00345')
+
             write_op.write_full(b'12345')
             write_op.truncate(2)
             self.ioctx.operate_write_op(write_op, "write_ops")