SaaS • Enterprise software • E-commerce
Migration and Platform Redesign Validation
Ship a major redesign, framework migration, or platform overhaul with confidence that existing user workflows still work.
Challenge
Major migrations — moving from one frontend framework to another, redesigning a core workflow, or consolidating acquired products — are high-stakes projects where regression risk is at its peak. The entire surface area of the application is changing, but users expect every existing workflow to keep working. Traditional approaches rely on manual regression testing that cannot keep pace with the volume of changes, and teams often discover breakages only after the migration ships.
Stably approach
Stably lets you record your current application's critical journeys as a baseline test suite, then run that same suite against the new version using URL replacement. AI auto-heal adapts tests to expected UI changes like updated selectors and reorganized layouts, reducing the noise from intentional redesign work. Visual assertions catch unintended layout drift and styling differences between old and new versions. The result is continuous regression detection throughout the migration, not just a manual check at the end.
What changes
Record your current app's critical flows as a baseline before changing anything
Before the migration starts, use Stably's web recorder or CLI to capture your top 50 user journeys on the existing application. These become your "contract" — the exact behavior users rely on today that the new version must preserve.
Run the same tests against old and new with one URL change
Set BASE_URL=legacy.example.com for the baseline run. Set BASE_URL=new.example.com for the migration build. Same test files, same assertions. Stably shows you exactly where the new version diverges from the old — intentional or not.
Auto-heal absorbs intentional redesign changes without noise
Your new design uses a different sidebar layout and updated button styles. Auto-heal adapts test selectors to match the new UI so you are not drowning in expected failures. You focus on the failures that indicate broken functionality — not broken selectors.
Visual assertions catch the things functional tests miss in a redesign
Functional tests confirm the settings page saves data. But they do not notice that the new version accidentally renders the form at half-width on mobile. toMatchScreenshotPrompt("the settings form fills the full width of the content area on mobile") catches it.
When this is the right fit
- A framework migration or major redesign is planned or in progress
- Past migrations caused a spike in post-launch bugs
- Manual regression testing cannot cover the full surface area of changes
- Teams delay migrations because the regression risk is too high