tests: Add ability to test different expected outputs based on Python version. Similar to the previous change, there was also a change in what gets escaped by `urllib.parse.quote` (as in: the tilde sign ('~') stopped being escaped). So now we need to be able to test different outputs in the tests, yay again.

[[source]]

url = "https://pypi.python.org/simple"
verify_ssl = true
name = "pypi"


[packages]

"e1839a8" = {path = ".", editable = true}


[dev-packages]

invoke = "*"
pytest = "*"
pytest-cov = "*"
pytest-mock = "*"
mock = "*"