feat: add cesium traffic signal countdowns

scripts/test-preview-assets.js

@@ -127,6 +127,23 @@ assert.match(html, /id="viewMode"/);
 assert.match(html, /data-view-mode="inspect"/);
 assert.match(html, /id="semanticToggles" class="control-subgroup hidden"/);
 
+const previewRuntime = fs.readFileSync(path.join(__dirname, "lib", "cesium-preview.js"), "utf8");
+const countdownFont = path.join(__dirname, "..", "assets", "fonts", "7LED-1.ttf");
+assert.ok(fs.existsSync(countdownFont), "7LED countdown font must be versioned with the project");
+assert.doesNotMatch(previewRuntime, /cylinder: \{ length: 6\.7/);
+assert.doesNotMatch(previewRuntime, /Traffic Signal Housing/);
+assert.match(previewRuntime, /asset\.category === "dynamic"/);
+assert.match(previewRuntime, /TrafficSignalDynamic_/);
+assert.match(previewRuntime, /countdown_\$\{String\(value\)\.padStart\(2, "0"\)\}/);
+assert.match(previewRuntime, /ColorBlendMode\.REPLACE/);
+assert.match(previewRuntime, /asset\.category === "countdown"/);
+assert.doesNotMatch(previewRuntime, /createCountdownDigits/);
+assert.doesNotMatch(previewRuntime, /digitMap/);
+assert.match(previewRuntime, /Do not cache a miss/);
+assert.match(previewRuntime, /scene\.requestRender/);
+assert.doesNotMatch(previewRuntime, /function addTrafficSignals\(viewer, signalData, start, placement\)/);
+assert.doesNotMatch(previewRuntime, /ellipsoid:/);
+
 const signals = buildTrafficSignals(
   { type: "FeatureCollection", features: [
     rectangle(120.0000, 30.0000, 0.00003, 0.000006),
@@ -138,10 +155,13 @@ const signals = buildTrafficSignals(
     ]] } },
   ] },
 );
-assert.equal(signals.version, 1);
+assert.equal(signals.version, 3);
 assert.equal(signals.signals.length, 2);
 assert.deepEqual(signals.signals.map((signal) => signal.phaseGroup), [0, 1]);
 assert.ok(signals.signals.every((signal) => Number.isFinite(signal.headingDegrees)));
+assert.equal(signals.layout.countdownLateralMeters, 1.15);
+assert.equal(signals.layout.countdownWidthMeters, 0.82);
+assert.ok(signals.signals.every((signal) => signal.pose?.head && signal.pose.lenses.length === 3));
 
 fs.rmSync(tempDir, { recursive: true, force: true });
 console.log("Preview asset tests passed.");