Currently for src_test python:3.4 is required due to only python3_4 in PYTHON_COMPAT. Please consider accepting 3.5 and potentially 3.6 too. This is pulling in python:3.4 on my ~arch system now with FEATURES=test :( After locally modifying PYTHON_COMPAT from ( python3_4 ) to ( python3_{4,5} ), the tests run and pass just fine with python3.5 on my ~mips. I have not tested 3.6.
python3_5 has been added to the wget-1.19 ebuild.