Login is often the first browser journey a team monitors because it protects access to the rest of the product. A useful login check should do more than click a button and wait for a new URL.
Build evidence around the experience
Create a dedicated monitoring account with predictable permissions and no multi-factor prompt. Select fields with accessible labels or explicit test identifiers. After submission, assert a piece of authenticated state such as the account name or a logout control.
Avoid tests that depend on production customer data. A controlled account makes failures easier to diagnose and prevents normal user activity from changing the expected result.
Keep the response actionable
Finally, keep the flow short. Authentication, one proof of success, and logout are usually enough. Longer tests mix unrelated failure modes and make incident response slower.