[cleanup] Misc

setup.cfg

@@ -1,6 +1,34 @@
 [wheel]
-universal = True
+universal = true
 
 [flake8]
-exclude = devscripts/lazy_load_template.py,devscripts/make_issue_template.py,setup.py,build,.git,venv
+exclude = build,venv,.tox,.git
 ignore = E402,E501,E731,E741,W503
+per_file_ignores =
+    ./devscripts/lazy_load_template.py: F401
+
+[tool:pytest]
+addopts = -ra -v --strict-markers
+markers =
+    download
+
+[tox:tox]
+skipsdist = true
+envlist = py{36,37,38,39,310},pypy{36,37,38,39}
+skip_missing_interpreters = true
+
+[testenv]  # tox
+deps =
+   pytest
+commands = pytest {posargs:"-m not download"}
+passenv = HOME  # For test_compat_expanduser
+setenv =
+    # PYTHONWARNINGS = error  # Catches PIP's warnings too
+
+[isort]
+py_version = 36
+multi_line_output = VERTICAL_HANGING_INDENT
+line_length = 80
+reverse_relative = true
+ensure_newline_before_comments = true
+include_trailing_comma = true