code: def test_implicit_head(app, client):
      class Index(flask.views.MethodView):
          def get(self):
              return flask.Response(
                  "Blub", headers={"X-Method": flask.request.method}
              )
  
      app.add_url_rule("/", view_func=Index.as_view("index"))
      rv = client.get("/")
      assert rv.data == b"Blub"
      assert rv.headers["X-Method"] == "GET"
      rv = client.head("/")
      assert rv.data == b""
      assert rv.headers["X-Method"] == "HEAD"
  
file_path: flask/tests/test_views.py
imports: import pytest
  from werkzeug.http import parse_set_header
  import flask.views
label_desc: Use image node_id 8 for calling a global function with example usage: test_implicit_head(app, client) and returns: flask