Release God's Eye View as open source

src/data/trailRenderer.test.mjs

@@ -0,0 +1,39 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import * as Cesium from 'cesium';
+import { createTrail } from './trailRenderer.js';
+
+test('trail visibility can change without discarding its accumulated geometry', () => {
+  const added = [];
+  const removed = [];
+  const viewer = {
+    isDestroyed: () => false,
+    entities: {
+      add(definition) {
+        added.push(definition);
+        return definition;
+      },
+      remove(entity) {
+        removed.push(entity);
+      },
+    },
+  };
+  const trail = createTrail(viewer, { color: '#ffffff' });
+  const positions = [
+    new Cesium.Cartesian3(1, 2, 3),
+    new Cesium.Cartesian3(4, 5, 6),
+  ];
+
+  trail.setVisible(false);
+  trail.setPositions(positions);
+  assert.equal(added.length, 1);
+  assert.equal(added[0].show, false);
+  assert.deepEqual(added[0].polyline.positions.getValue(), positions);
+
+  trail.setVisible(true);
+  assert.equal(added[0].show, true);
+  assert.deepEqual(added[0].polyline.positions.getValue(), positions);
+
+  trail.destroy();
+  assert.deepEqual(removed, [added[0]]);
+});