UI testing iOS interview questions

UI testing questions test whether you know where automated UI tests help and how to keep them from becoming a flaky maintenance burden.

The mechanics

XCUITest drives the app like a user, finding elements and asserting state. Use accessibility identifiers to locate elements reliably instead of brittle text or index lookups, and use expectations and waits rather than fixed sleeps so tests are not timing-dependent. Explain the tradeoff that UI tests are slower and more fragile than unit tests.

Keeping them reliable

Reserve UI tests for a few critical end-to-end flows, and push detailed logic down into fast unit tests. Reduce flakiness with stable identifiers, proper waiting, controlled test data, and resetting app state between runs. Being clear that most coverage should live in unit tests, with UI tests as a thin smoke layer, is the senior view.

Go deeper than a summary

Share Your Screen works topics like this through in full: 75 solved Swift problems with tests, 9 real case studies, and 7 annotated mock interviews, so you rehearse the live round instead of just reading about it.

Get the book

Frequently asked

What belongs in a UI test vs a unit test?

UI tests cover a few critical end-to-end flows; unit tests cover detailed logic. Keep most coverage in fast unit tests and use UI tests sparingly.

How do you reduce UI test flakiness?

Use accessibility identifiers, wait on expectations instead of fixed sleeps, control test data, and reset app state between runs.