Your SaaS onboarding flow is the highest-leverage feature in your product. Every user hits it. Every bug costs a conversion. A broken step 3 of 5 means the user never sees the product.
Despite this, onboarding flows are among the least-tested features. They're built once, iterated rarely, and tested manually by people who already know the product.
The users who encounter bugs — new signups — never tell you. They just leave.
Why Onboarding Bugs Are Invisible
New signups who hit a bug aren't invested enough to report it. A paying customer might email support. A new signup just closes the tab. This creates a silent conversion leak invisible in analytics.
What to Test
Signup: Email validation (including unusual formats), password creation, OAuth for every provider, duplicate email handling, confirmation email delivery.
Initial setup: Every path through the wizard. Optional steps: both completing and skipping. Going back and changing earlier answers.
First value moment: Whatever delivers the first "aha" — complete flow including error states.
Invitations: Invite flow, acceptance flow, edge cases (existing user, revoked invite, expired invite).
TestSprite generates and runs tests for all these flows on every PR. When a code change breaks onboarding, the test catches it before production silently kills your conversion rate.