release version 3.1.2 (#5800)

tests/test_testing.py

@@ -6,7 +6,7 @@ import pytest
 import flask
 from flask import appcontext_popped
 from flask.cli import ScriptInfo
-from flask.globals import _cv_request
+from flask.globals import _cv_app
 from flask.json import jsonify
 from flask.testing import EnvironBuilder
 from flask.testing import FlaskCliRunner
@@ -382,4 +382,4 @@ def test_client_pop_all_preserved(app, req_ctx, client):
     # close the response, releasing the context held by stream_with_context
     rv.close()
     # only req_ctx fixture should still be pushed
-    assert _cv_request.get(None) is req_ctx
+    assert _cv_app.get(None) is req_ctx