Define HAS_AUTHLIB once in tests

sick of copypasting

tests/config/test_oauth_delegation.py

@@ -22,15 +22,7 @@
 
 from tests.server import get_clock, setup_test_homeserver
 from tests.unittest import TestCase, skip_unless
-from tests.utils import default_config
-
-try:
-    import authlib  # noqa: F401
-
-    HAS_AUTHLIB = True
-except ImportError:
-    HAS_AUTHLIB = False
-
+from tests.utils import HAS_AUTHLIB, default_config
 
 # These are a few constants that are used as config parameters in the tests.
 SERVER_NAME = "test"

tests/handlers/test_oauth_delegation.py

@@ -41,15 +41,7 @@
 
 from tests.test_utils import FakeResponse, get_awaitable_result
 from tests.unittest import HomeserverTestCase, skip_unless
-from tests.utils import mock_getRawHeaders
-
-try:
-    import authlib  # noqa: F401
-
-    HAS_AUTHLIB = True
-except ImportError:
-    HAS_AUTHLIB = False
-
+from tests.utils import HAS_AUTHLIB, mock_getRawHeaders
 
 # These are a few constants that are used as config parameters in the tests.
 SERVER_NAME = "test"

tests/rest/admin/test_jwks.py

@@ -19,13 +19,7 @@
 from synapse.rest.synapse.client import build_synapse_client_resource_tree
 
 from tests.unittest import HomeserverTestCase, override_config, skip_unless
-
-try:
-    import authlib  # noqa: F401
-
-    HAS_AUTHLIB = True
-except ImportError:
-    HAS_AUTHLIB = False
+from tests.utils import HAS_AUTHLIB
 
 
 @skip_unless(HAS_AUTHLIB, "requires authlib")

tests/rest/client/test_keys.py

@@ -30,13 +30,7 @@
 from tests import unittest
 from tests.http.server._base import make_request_with_cancellation_test
 from tests.unittest import override_config
-
-try:
-    import authlib  # noqa: F401
-
-    HAS_AUTHLIB = True
-except ImportError:
-    HAS_AUTHLIB = False
+from tests.utils import HAS_AUTHLIB
 
 
 class KeyQueryTestCase(unittest.HomeserverTestCase):

tests/rest/test_well_known.py

@@ -16,13 +16,7 @@
 from synapse.rest.well_known import well_known_resource
 
 from tests import unittest
-
-try:
-    import authlib  # noqa: F401
-
-    HAS_AUTHLIB = True
-except ImportError:
-    HAS_AUTHLIB = False
+from tests.utils import HAS_AUTHLIB
 
 
 class WellKnownTests(unittest.HomeserverTestCase):

tests/utils.py

@@ -30,6 +30,13 @@
 from synapse.storage.engines import create_engine
 from synapse.storage.prepare_database import prepare_database
 
+try:
+    import authlib  # noqa: F401
+
+    HAS_AUTHLIB = True
+except ImportError:
+    HAS_AUTHLIB = False
+
 # set this to True to run the tests against postgres instead of sqlite.
 #
 # When running under postgres, we first create a base database with the name