tests: remove pytest-flask dependency

poetry.lock

@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 1.7.0 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.7.1 and should not be changed by hand.
 
 [[package]]
 name = "aiosmtpd"
@@ -1308,25 +1308,6 @@ files = [
 [package.dependencies]
 pytest-cover = "*"
 
-[[package]]
-name = "pytest-flask"
-version = "1.3.0"
-description = "A set of py.test fixtures to test Flask applications."
-optional = false
-python-versions = ">=3.7"
-files = [
-    {file = "pytest-flask-1.3.0.tar.gz", hash = "sha256:58be1c97b21ba3c4d47e0a7691eb41007748506c36bf51004f78df10691fa95e"},
-    {file = "pytest_flask-1.3.0-py3-none-any.whl", hash = "sha256:c0e36e6b0fddc3b91c4362661db83fa694d1feb91fa505475be6732b5bc8c253"},
-]
-
-[package.dependencies]
-Flask = "*"
-pytest = ">=5.2"
-Werkzeug = "*"
-
-[package.extras]
-docs = ["Sphinx", "sphinx-rtd-theme"]
-
 [[package]]
 name = "pytest-httpserver"
 version = "1.0.8"
@@ -2110,4 +2091,4 @@ sql = ["passlib", "sqlalchemy", "sqlalchemy-json", "sqlalchemy-utils"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.8"
-content-hash = "7372f06aa097a115c189932bb0afea25c21cfdbdefd81da5b95fab228da50217"
+content-hash = "96297d25c9545e9469b6f3f7d1cab42bc273615710d4c7b1320fd9e2f3549248"

pyproject.toml

@@ -83,7 +83,6 @@ pre-commit = "*"
 pyquery = "*"
 pytest = "*"
 pytest-coverage = "*"
-pytest-flask = "==1.3.0"
 pytest-httpserver = "*"
 pytest-lazy-fixture = "==0.6.3"
 pytest-xdist = "^3.3.1"

tests/conftest.py

@@ -123,7 +123,9 @@ def configuration(smtpd):
 
 @pytest.fixture
 def app(configuration, backend):
-    return create_app(configuration, backend=backend)
+    app = create_app(configuration, backend=backend)
+    with app.test_request_context():
+        yield app
 
 
 @pytest.fixture