chore: fix missing return types

Author: smarlhens

pyproject.toml

@@ -89,5 +89,5 @@ extend-select = [
 ]
 
 [tool.mypy]
-files = ["src"]
+files = ["src", "tests"]
 strict = "true"

src/myapplication/main.py

@@ -1,8 +1,8 @@
-def hello_world():
+def hello_world() -> str:
     return "Hello World"
 
 
-def main():
+def main() -> None:
     print(hello_world())  # noqa: T201 print only used as placeholder :)
 
 

tests/test_myapplication.py

@@ -1,6 +1,6 @@
 from myapplication.main import hello_world
 
 
-def test_hello_world():
+def test_hello_world() -> None:
     if hello_world() != "Hello World":
         raise ValueError('Expected value to be "Hello World"')