Add integration tests

Author: per1234

.editorconfig

@@ -15,6 +15,10 @@ indent_style = tab
 indent_size = unset
 indent_style = space
 
+[*.py]
+indent_size = 4
+indent_style = space
+
 [*.{yaml,yml}]
 indent_size = 2
 indent_style = space

.flake8

@@ -0,0 +1,9 @@
+# See: https://flake8.pycqa.org/en/latest/user/configuration.html
+
+[flake8]
+doctests = True
+# W503 and W504 are mutually exclusive. PEP 8 recommends line break before.
+ignore = W503
+max-complexity = 10
+max-line-length = 120
+select = E,W,F,C,N