diff --git a/amodem/tests/test_calib.py b/amodem/tests/test_calib.py
index d01d8cb..03855ca 100644
--- a/amodem/tests/test_calib.py
+++ b/amodem/tests/test_calib.py
@@ -19,14 +19,6 @@ class ProcessMock(object):
         self.stdout = self
         self.bytes_per_sample = 2
 
-    def launch(self, *args, **kwargs):
-        return self
-
-    __call__ = launch
-
-    def kill(self):
-        pass
-
     def write(self, data):
         assert self.buf.tell() < 10e6
         self.buf.write(data)
diff --git a/amodem/tests/test_stream.py b/amodem/tests/test_stream.py
index e959f3c..848e33c 100644
--- a/amodem/tests/test_stream.py
+++ b/amodem/tests/test_stream.py
@@ -29,7 +29,6 @@ def test_read():
         j += 1
 
     try:
-        for buf in f:
-            pass
+        next(f)
     except IOError as e:
         assert e.args == ('timeout',)
diff --git a/amodem/tests/test_transfer.py b/amodem/tests/test_transfer.py
index 057d5d9..308053e 100644
--- a/amodem/tests/test_transfer.py
+++ b/amodem/tests/test_transfer.py
@@ -14,15 +14,7 @@ logging.basicConfig(level=logging.DEBUG,  # useful for debugging
                     format='%(asctime)s %(levelname)-12s %(message)s')
 
 
-class Args(object):
-    def __init__(self, **kwargs):
-        self.__dict__.update(kwargs)
-
-    def __getattr__(self, name):
-        return None
-
-
-def run(size, chan=None, df=0, success=True, reader=None, cfg=None):
+def run(size, chan=None, df=0, success=True, cfg=None):
     if cfg is None:
         cfg = config.fastest()
     tx_data = os.urandom(size)
@@ -43,8 +35,6 @@ def run(size, chan=None, df=0, success=True, reader=None, cfg=None):
     rx_data = BytesIO()
     dump = BytesIO()
 
-    if reader:
-        rx_audio = reader(rx_audio)
     try:
         result = main.recv(config=cfg, src=rx_audio, dst=rx_data,
                            dump_audio=dump, pylab=None)