code: def test_default_error_handler():
      bp = flask.Blueprint("bp", __name__)
  
      @bp.errorhandler(HTTPException)
      def bp_exception_handler(e):
          assert isinstance(e, HTTPException)
          assert isinstance(e, NotFound)
          return "bp-default"
  
      @bp.errorhandler(Forbidden)
      def bp_forbidden_handler(e):
          assert isinstance(e, Forbidden)
          return "bp-forbidden"
  
      @bp.route("/undefined")
      def bp_registered_test():
          raise NotFound()
  
      @bp.route("/forbidden")
      def bp_forbidden_test():
          raise Forbidden()
  
      app = flask.Flask(__name__)
  
      @app.errorhandler(HTTPException)
      def catchall_exception_handler(e):
          assert isinstance(e, HTTPException)
          assert isinstance(e, NotFound)
          return "default"
  
      @app.errorhandler(Forbidden)
      def catchall_forbidden_handler(e):
          assert isinstance(e, Forbidden)
          return "forbidden"
  
      @app.route("/forbidden")
      def forbidden():
          raise Forbidden()
  
      @app.route("/slash/")
      def slash():
          return "slash"
  
      app.register_blueprint(bp, url_prefix="/bp")
  
      c = app.test_client()
      assert c.get("/bp/undefined").data == b"bp-default"
      assert c.get("/bp/forbidden").data == b"bp-forbidden"
      assert c.get("/undefined").data == b"default"
      assert c.get("/forbidden").data == b"forbidden"
      # Don't handle RequestRedirect raised when adding slash.
      assert c.get("/slash", follow_redirects=True).data == b"slash"
  
file_path: flask/tests/test_user_error_handler.py
imports: import pytest
  from werkzeug.exceptions import Forbidden
  from werkzeug.exceptions import HTTPException
  from werkzeug.exceptions import InternalServerError
  from werkzeug.exceptions import NotFound
  import flask
label_desc: Use image node_id 5 for calling a global function with example usage: test_default_error_handler() and returns: str, str, str, str, str