When creating a new NHS org, set default email branding to NHS

This is more appropriate default for that org than gov.uk branding
and will help us with our work to make setting the branding more
self-service.

tests/app/organisation/test_rest.py

@@ -2,6 +2,7 @@ import uuid
 from datetime import datetime
 
 import pytest
+from flask import current_app
 from freezegun import freeze_time
 from sqlalchemy.exc import SQLAlchemyError
 
@@ -187,6 +188,43 @@ def test_post_create_organisation(admin_request, notify_db_session, crown):
     assert len(organisation) == 1
 
 
+@pytest.mark.parametrize('org_type', ["nhs_central", "nhs_local", "nhs_gp"])
+def test_post_create_organisation_sets_default_nhs_branding_for_nhs_orgs(
+    admin_request, notify_db_session, org_type
+):
+    # 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']
+    create_email_branding(
+        id=nhs_email_branding_id,
+        logo='1ac6f483-3105-4c9e-9017-dd7fb2752c44-nhs-blue_x2.png',
+        name='NHS'
+    )
+
+    data = {
+        'name': 'test organisation',
+        'active': True,
+        'crown': False,
+        'organisation_type': org_type,
+    }
+
+    response = admin_request.post(
+        'organisation.create_organisation',
+        _data=data,
+        _expected_status=201
+    )
+
+    organisations = Organisation.query.all()
+
+    assert data['name'] == response['name']
+    assert data['active'] == response['active']
+    assert data['crown'] == response['crown']
+    assert data['organisation_type'] == response['organisation_type']
+
+    assert len(organisations) == 1
+    assert organisations[0].email_branding_id == uuid.UUID(nhs_email_branding_id)
+
+
 def test_post_create_organisation_existing_name_raises_400(admin_request, sample_organisation):
     data = {
         'name': sample_organisation.name,