view function is actually type checked

tests/typing/typing_route.py

@@ -1,6 +1,6 @@
+from __future__ import annotations
+
 from http import HTTPStatus
-from typing import Tuple
-from typing import Union
 
 from flask import Flask
 from flask import jsonify
@@ -8,42 +8,51 @@ from flask.templating import render_template
 from flask.views import View
 from flask.wrappers import Response
 
-
 app = Flask(__name__)
 
 
-@app.route("/")
-def hello_world() -> str:
+@app.route("/str")
+def hello_str() -> str:
     return "<p>Hello, World!</p>"
 
 
+@app.route("/bytes")
+def hello_bytes() -> bytes:
+    return b"<p>Hello, World!</p>"
+
+
 @app.route("/json")
-def hello_world_json() -> Response:
+def hello_json() -> Response:
     return jsonify({"response": "Hello, World!"})
 
 
+@app.route("/status")
+@app.route("/status/<int:code>")
+def tuple_status(code: int = 200) -> tuple[str, int]:
+    return "hello", code
+
+
+@app.route("/status-enum")
+def tuple_status_enum() -> tuple[str, int]:
+    return "hello", HTTPStatus.OK
+
+
+@app.route("/headers")
+def tuple_headers() -> tuple[str, dict[str, str]]:
+    return "Hello, World!", {"Content-Type": "text/plain"}
+
+
 @app.route("/template")
 @app.route("/template/<name>")
-def return_template(name: Union[str, None] = None) -> str:
+def return_template(name: str | None = None) -> str:
     return render_template("index.html", name=name)
 
 
-@app.errorhandler(HTTPStatus.INTERNAL_SERVER_ERROR)
-def error_500(e) -> Tuple[str, int]:
-    return "<p>Sorry, we are having problems</p>", HTTPStatus.INTERNAL_SERVER_ERROR
-
-
-@app.before_request
-def before_request() -> None:
-    app.logger.debug("Executing a sample before_request function")
-    return None
-
-
 class RenderTemplateView(View):
-    def __init__(self: "RenderTemplateView", template_name: str) -> None:
+    def __init__(self: RenderTemplateView, template_name: str) -> None:
         self.template_name = template_name
 
-    def dispatch_request(self: "RenderTemplateView") -> str:
+    def dispatch_request(self: RenderTemplateView) -> str:
         return render_template(self.template_name)