Challenge 3: Snapshot Blindness on a Large Form — Possible Solution
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WHY THE LARGE, FREQUENTLY-EDITED FORM IS MORE LIKELY TO CAUSE SNAPSHOT
BLINDNESS: a large form has many more elements, and it changes often
as new fields are added, validation messages are tweaked, or styling
is adjusted — each of those routine changes produces a snapshot diff.
Because the diffs are frequent AND large (a form has far more rendered
DOM than a small icon), a developer reviewing yet another sprawling
diff full of mostly-irrelevant noise (whitespace, attribute ordering,
unrelated sibling elements) is naturally inclined to skim past it and
press "update" rather than carefully verify every line — especially
under time pressure. This is exactly this chapter's "snapshot
blindness" concern: the sheer frequency and size of changes trains the
reviewer to stop actually reviewing.

WHY THE SMALL, RARELY-CHANGED ICON COMPONENT DOESN'T HAVE THIS PROBLEM:
its snapshot changes RARELY, so on the rare occasion it DOES change,
that's a genuine signal worth real attention — the diff is also small
enough to actually read in full, and there's no habit of routinely
dismissing it, since routine dismissal never had a chance to form in
the first place.

A MORE TARGETED ALTERNATIVE FOR THE FORM COMPONENT: instead of one
broad toMatchSnapshot() covering the entire rendered form, write
specific, behavior-focused assertions for the things that actually
matter — e.g. getByLabelText("Email") exists and is required,
getByRole("button", {name: "Submit"}) is disabled until all required
fields are filled, a specific validation message appears via findByText
after an invalid submission attempt. Each of these tests only fails
when something a real user would actually notice has broken, and each
failure is immediately specific about WHAT broke — exactly the
property that a single sprawling snapshot cannot provide, and directly
consistent with this chapter's "targeted assertions vs. full snapshots"
comparison.