A generated tileset (a plate at ellipsoid level, 50 m and 200 m blocks and
a pitched roof, 27 KB) replaces Google's tiles when a QA page passes
?qaTileset=/path; only a root-relative path on the page origin is
accepted, and the Google credit is not shown for it. The strict harness
serves the set from disk, so nothing reaches Google.
qa-tiles-fixture checks on both engines that sampleHeight reads the block
at 50 m, clampToHeight lands on the roof, tiles and terrain drapes draw
where they should, tilesLoaded turns true, surface points land on the
roof within their budget, and pick renders per pass stay within it.
The probe exposes settled() and the first-frame outcome; scripts/qa/ready.mjs
waits for drawn frames with the camera at rest and for a pick at the click
position, with a deadline and its reason in the error. The strict scenarios
use these instead of fixed pauses and loading-screen polling, and the
hidden-switch scenario checks how the loading screen was lifted instead of
how long it took.
Each switch scenario now records a draw ledger per engine and runs a
contract monitor; both write to the scenario's evidence file only, with an
empty allowlist until browser runs show what differs on purpose.
Counters that may only fall, each with a committed baseline and a test
that fails on growth:
- report-engine-coupling.mjs gains layer modules that take the viewer
in attachRenderer (33), layer folders with their own "view being
restored" flag (9), engine.surface calls outside src/globe (41) and
layer ids named in the engine switch (3).
- report-qa-harness.mjs counts QA scripts that launch Chrome themselves
(98), wait with fixed sleeps (117), take the hidden loading screen as
readiness (9), read Cesium-only objects (75) or define their own
waitFor helpers (19).
- withCallLog records every contract member the contract suite calls on
the fake engine; contractCoverage.test.mjs fails when a member outside
contract-uncalled-baseline.json goes uncalled, and when a listed one
is called now, so the list of 12 only shrinks.
German Khokhlov