--- test/test_upload.rb	2018-01-22 08:15:30.996002204 +0100
+++ test/test_upload.rb.1	2018-01-22 08:18:09.328002581 +0100
@@ -155,8 +155,9 @@
     expect_scp_session("-t /path/to/remote") do |channel|
       channel.gets_ok
     end
-
-    assert_raises(Net::SCP::Error) { scp.upload!("/path/to/local", "/path/to/remote") }
+    Net::SSH::Test::Extensions::IO.with_test_extension do
+      assert_raises(Net::SCP::Error) { scp.upload!("/path/to/local", "/path/to/remote") }
+    end
   end
 
   def test_upload_empty_directory_should_create_directory_and_finish