fixup! test: use pytest, test telnet.c

Author: jonrebm

test/test_telnet.py

@@ -60,7 +60,7 @@ def run():
     return _recv
 
 
-@pytest.mark.parametrize("buf", [300, 512, 1023, 1024, 1025, 4000])
+@pytest.mark.parametrize("buf", [10, 1023, 1024, 1025, 4000])
 def test_no_cmd(telnet_recv, buf):
     payload = make_pattern(buf)