<NME> test-requirements.txt
<BEF> factory-boy>=2.4
testfixtures==4.7.0
httmock==1.2.5
tox
asynctest

<MSG> Few fixes.

<DFF> @@ -1,3 +1,4 @@
 factory-boy>=2.4
 testfixtures==4.7.0
 httmock==1.2.5
+tox

Few fixes.