[#34] TDD: add failing black / autopep8 tests

Signed-off-by: Bryant Finney <[email protected]>

Author: bryant-finney

.github/workflows/usage.yml

@@ -45,7 +45,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        extras: ["", "[dev]"]
+        extras: ["", "[dev]", "[black]", "[autopep8]"]
         manager: [pip, pipenv]
         os: [ubuntu-latest, windows-latest, macos-latest]
         py: [3.7, 3.8]