refactor: separate traffic and bikeshare components

src/data/trafficTiming.test.mjs

@@ -1,11 +1,11 @@
 import assert from 'node:assert/strict';
-import { readFileSync } from 'node:fs';
+import { readLayerSource } from '../testSupport/readLayerSource.mjs';
 import test from 'node:test';
 import { fileURLToPath } from 'node:url';
 
 import { getTrafficTimingDiagnostics } from './traffic.js';
 
-const SOURCE = readFileSync(new URL('./traffic.js', import.meta.url), 'utf8');
+const SOURCE = readLayerSource(new URL('./traffic.js', import.meta.url), 'utf8').replace(/parts\.(?:model|timing)\./g, '');
 
 function functionBody(name) {
   const declaration = `function ${name}(`;
@@ -166,9 +166,8 @@ test('traffic timing pairs real ordering to the scheduling change and guards re-
       plugins: [{
         name: 'traffic-timing-test-hooks',
         transform(code, id) {
-          if (!id.endsWith('/src/data/traffic.js')) return null;
-          return `${code}\nexport const __trafficTimingTestHooks = {\n` +
-            `  currentAnchor: () => _trafficTimingCurrentAnchor,\n};\n`;
+          if (!id.endsWith('/src/layers/traffic/index.js')) return null;
+          return code.replace('return Object.assign(', 'return Object.assign({ __trafficTimingTestHooks: { currentAnchor: () => state._trafficTimingCurrentAnchor } },');
         },
       }],
     });
@@ -248,7 +247,7 @@ test('traffic timing pairs real ordering to the scheduling change and guards re-
     // and moveEnd arrives only after cameraEventWaitTime (~500 ms).
     setLongitude(-97.72);
     changed.raise();
-    const anchorA = traffic.__trafficTimingTestHooks.currentAnchor();
+    const anchorA = traffic.default.__trafficTimingTestHooks.currentAnchor();
     const anchorMarkA = performance.getEntriesByType('mark').find((entry) => (
       entry.detail?.segment === 'last-camera-change'
       && entry.detail?.interactionId === anchorA.interactionId
@@ -262,7 +261,7 @@ test('traffic timing pairs real ordering to the scheduling change and guards re-
       traceObjectsCreated: 1,
       uncorrelatedTracesDropped: 0,
     });
-    assert.equal(traffic.__trafficTimingTestHooks.currentAnchor(), null);
+    assert.equal(traffic.default.__trafficTimingTestHooks.currentAnchor(), null);
     const fetchFromA = performance.getEntriesByType('measure').find((entry) => (
       entry.detail?.segment === 'last-camera-change-to-fetch-start'
       && entry.detail?.interactionId === anchorA.interactionId
@@ -288,16 +287,16 @@ test('traffic timing pairs real ordering to the scheduling change and guards re-
     // and must count one drop without consuming C's current anchor.
     setLongitude(-97.70);
     changed.raise();
-    const anchorB = traffic.__trafficTimingTestHooks.currentAnchor();
+    const anchorB = traffic.default.__trafficTimingTestHooks.currentAnchor();
     const [timerBId, timerB] = pendingDebounce();
     setLongitude(-97.68);
     changed.raise();
-    const anchorC = traffic.__trafficTimingTestHooks.currentAnchor();
+    const anchorC = traffic.default.__trafficTimingTestHooks.currentAnchor();
     assert.notEqual(anchorC.interactionId, anchorB.interactionId);
     assert.equal(timeouts.has(timerBId), false, 'the ordinary debounce path must cancel B');
     await timerB.callback();
     assert.equal(
-      traffic.__trafficTimingTestHooks.currentAnchor().interactionId,
+      traffic.default.__trafficTimingTestHooks.currentAnchor().interactionId,
       anchorC.interactionId,
       'a stale callback must not consume the newer C anchor',
     );