FrontendHaltTesting·Intermediate·Conceptual·1 min read
What does visual regression testing catch that assertion-based tests miss?
Short interview answer
Appearance and layout: spacing, alignment, color, font rendering, unintended reflow or wrapping, and overlap. An assertion test confirms an element exists with certain text; it says nothing about whether the element looks right or shifted four pixels.
Key takeaway
Explain the underlying mental model clearly, then support it with a concrete example and its trade-offs.