Convert test_rand to use pytest-style tests (#563)

Fix up the assert helpers, subclass form `object` rather than test case,
and use parametrization where appropriate.

One helper method on the original `TestCase` was the ability to create
temporary directories that were cleaned up at the end of the test --
now we use a pytest fixture instead: http://doc.pytest.org/en/latest/tmpdir.html

Addresses #340.

1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 8701977..9a41630 100644
--- a/tox.ini
+++ b/tox.ini
@@ -17,7 +17,7 @@ setenv =
     PIP_NO_BINARY=cryptography
 commands =
     openssl version
-    coverage run --parallel -m pytest {posargs}
+    coverage run --parallel -m pytest -v {posargs}
 
 [testenv:py27-twistedMaster]
 deps =