convert cqlshlib from nose to pytest

Patch by brandonwilliams; reviewed by bereng for CASSANDRA-18088

pylib/cassandra-cqlsh-tests.sh

@@ -129,7 +129,7 @@ ccm start --wait-for-binary-proto
 cd ${CASSANDRA_DIR}/pylib/cqlshlib/
 
 set +e # disable immediate exit from this point
-nosetests
+pytest
 RETURN="$?"
 
 ccm remove

pylib/cqlshlib/test/cassconnect.py

@@ -20,7 +20,7 @@ import io
 import os.path
 import random
 import string
-from nose.tools import nottest
+import pytest
 
 from .basecase import TEST_HOST, TEST_PORT, cql, cqlsh, cqlshlog, policy, quote_name, test_dir
 from .run_cqlsh import run_cqlsh, call_cqlsh
@@ -152,7 +152,7 @@ def cql_rule_set():
 class DEFAULTVAL: pass
 
 
-@nottest
+@pytest.mark.skip(reason="not a test")
 def testrun_cqlsh(keyspace=DEFAULTVAL, **kwargs):
     # use a positive default sentinel so that keyspace=None can be used
     # to override the default behavior
@@ -161,7 +161,7 @@ def testrun_cqlsh(keyspace=DEFAULTVAL, **kwargs):
     return run_cqlsh(keyspace=keyspace, **kwargs)
 
 
-@nottest
+@pytest.mark.skip(reason="not a test")
 def testcall_cqlsh(keyspace=None, **kwargs):
     if keyspace is None:
         keyspace = get_keyspace()

pylib/cqlshlib/test/test_sslhandling.py

@@ -17,11 +17,11 @@
 from cassandra.policies import SimpleConvictionPolicy
 from cassandra.pool import Host
 from cqlshlib.sslhandling import ssl_settings
-from nose.tools import assert_raises
 
 import unittest
 import os
 import ssl
+import pytest
 
 class SslSettingsTest(unittest.TestCase):
 
@@ -53,7 +53,7 @@ class SslSettingsTest(unittest.TestCase):
 
     def test_invalid_ssl_versions_from_env(self):
         msg = "invalid_ssl is not a valid SSL protocol, please use one of TLSv1, TLSv1_1, or TLSv1_2"
-        with assert_raises(SystemExit) as error:
+        with pytest.raises(SystemExit) as error:
             self._test_ssl_version_from_env('invalid_ssl')
             assert msg == error.exception.message
 
@@ -69,7 +69,7 @@ class SslSettingsTest(unittest.TestCase):
 
     def test_invalid_ssl_version_config(self):
         msg = "invalid_ssl is not a valid SSL protocol, please use one of TLSv1, TLSv1_1, or TLSv1_2"
-        with assert_raises(SystemExit) as error:
+        with pytest.raises(SystemExit) as error:
             ssl_settings(self.host, os.path.join('test', 'config', 'sslhandling_invalid.config'))
             assert msg in error.exception.message
-            
+            

pylib/pytest.ini

@@ -0,0 +1,2 @@
+[pytest]
+addopts = --junit-xml=nosetests.xml

pylib/requirements.txt

@@ -11,8 +11,7 @@ docopt
 enum34
 flaky
 mock
-nose
-nose-test-select
+pytest
 parse
 pycodestyle
 psutil