add a diff-related unit test #11892

Job	Run time
javascript-lint	8s
Detect which file has changed	6s
infrahub-poetry-check	0s
helm-lint	0s
markdown-lint	0s
action-lint	0s
python-lint	8s
yaml-lint	0s
frontend-tests	0s
backend-tests-integration	14m 30s
backend-benchmark	5m 25s
backend-tests-unit	10m 36s
backend-tests-unit-memgraph	11m 37s
backend-validate-generated	39s
documentation	0s
E2E-testing-playwright	9m 52s
E2E-testing-invoke-demo-start	0s
validate-documentation-style	0s
validate-generated-documentation	3m 8s
coverall-report	3s
	56m 12s

Provide feedback