If you logic depends on that happy path, make a test for it. But as I explained in another comment that test should not justify the lack of individual feature t

If you logic depends on that happy path, make a test for it. But as I explained in another comment that test should not justify the lack of individual feature tests, which should not only test the happy path but other corner cases too. On my company we developers usually create white-box unitary/feature tests (we know how it was implemented, so we check components knowing that). But then we have an independent QA team that creates and run black-box flow tests (they don't know how it was implemented, only what it should do and interact)