Update test deps.

Author: taeold

tox.ini

@@ -24,11 +24,13 @@ envlist =
 usedevelop = true
 deps =
  docker
+ httpx
  pytest-asyncio
  pytest-cov
  pytest-integration
  pretend
-extras = async
+extras =
+ async
 setenv =
  PYTESTARGS = --cov=functions_framework --cov-branch --cov-report term-missing --cov-fail-under=100
  windows-latest: PYTESTARGS =
@@ -42,8 +44,6 @@ deps =
  isort
  mypy
  build
-extras =
- async
 commands =
  black --check src tests conftest.py --exclude tests/test_functions/background_load_error/main.py
  isort -c src tests conftest.py