EveryInteractiveControlDeclaresARealHandlerBinding asserted an exact
Assert.Equal(156, controls.Length), backed by ~60 lines of running
commentary recording every markup edit that ever bumped the number. That
count was a pure change detector: it carried no signal the test's own
per-control handler/enabled loop couldn't already catch on its own, and
it forced an edit to THIS test file every time an unrelated tab gained
or lost a single control.
Replaced the exact count with Assert.NotEmpty(controls) — it still
guards the selector itself (a broken interactive-element-name filter
that matched nothing would otherwise pass the loop vacuously) — and kept
the real assertion (the per-control handler/enabled loop) unchanged.
Moved the removed count's full history into this same commit's ledger
entry in docs/plans/2026-09-07-campaign-vt-slice7-tabs.md, per item
F13's own instruction.
Mutation named: temporarily broke the controls selector (appended
`&& false` to the interactive-element filter) and confirmed
Assert.NotEmpty fails ("Collection was empty") before restoring it.
MossTank suite holds at 678 (no test added or removed, one assertion
replaced). Full solution build green; App markup/plugin filter 203/203.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
6b42fd68ed