Migrate from `Unittest` to `pytest`

I only migrated tests that will continue to be used even after the
removal of the old `Simple*` classes in #1196.

The `decorator` in tox is leftover from a previous usage that was
already removed from the code but not from tox.

1 files changed, 0 insertions, 2 deletions

diff --git a/test/conftest.py b/test/conftest.py
index a751d95..ffaae03 100644
--- a/test/conftest.py
+++ b/test/conftest.py
@@ -1,7 +1,5 @@
 from __future__ import absolute_import
 
-import inspect
-
 import pytest
 
 from test.fixtures import KafkaFixture, ZookeeperFixture, random_string, version as kafka_version