Refactor creating nhs branding in tests into a fixture

tests/app/conftest.py

@@ -53,6 +53,7 @@ from app.models import (
 from tests import create_admin_authorization_header
 from tests.app.db import (
     create_api_key,
+    create_email_branding,
     create_inbound_number,
     create_invited_org_user,
     create_job,
@@ -919,6 +920,19 @@ def broadcast_organisation(notify_db_session):
     return org
 
 
+@pytest.fixture
+def nhs_email_branding(notify_db_session):
+    # we wipe email_branding table in test db between the tests, so we have to recreate this branding
+    # that is normally present on all environments and applied through migration
+    nhs_email_branding_id = current_app.config['NHS_EMAIL_BRANDING_ID']
+
+    return create_email_branding(
+        id=nhs_email_branding_id,
+        logo='1ac6f483-3105-4c9e-9017-dd7fb2752c44-nhs-blue_x2.png',
+        name='NHS'
+    )
+
+
 @pytest.fixture
 def restore_provider_details(notify_db, notify_db_session):
     """