fix: make news geotagging deterministic

test/dashboard-geotagging.test.mjs

@@ -0,0 +1,47 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { geoTagText, stableGeoJitter } from '../dashboard/inject.mjs';
+
+test('geoTagText matches headlines case-insensitively', () => {
+  assert.deepEqual(geoTagText('ukraine reports new air defense activity'), {
+    lat: 49,
+    lon: 32,
+    region: 'Ukraine',
+  });
+
+  assert.deepEqual(geoTagText('flooding disrupts são paulo transport'), {
+    lat: -23.5,
+    lon: -46.6,
+    region: 'São Paulo',
+  });
+});
+
+test('geoTagText prefers longer place names before broad countries', () => {
+  assert.deepEqual(geoTagText('New York markets react before wider US session'), {
+    lat: 40.7,
+    lon: -74,
+    region: 'New York',
+  });
+});
+
+test('geoTagText uses word boundaries to reduce false positives', () => {
+  assert.equal(geoTagText('A music festival announces its lineup'), null);
+  assert.equal(geoTagText('Officials discuss a new focus for aid'), null);
+  assert.deepEqual(geoTagText('US officials discuss a new aid package'), {
+    lat: 39,
+    lon: -98,
+    region: 'US',
+  });
+});
+
+test('stableGeoJitter is deterministic and bounded', () => {
+  const key = 'BBC|lower-case ukraine headline|Sun, 17 May 2026 12:00:00 GMT|https://example.test/a';
+  const latA = stableGeoJitter(key, 'lat');
+  const latB = stableGeoJitter(key, 'lat');
+  const lon = stableGeoJitter(key, 'lon');
+
+  assert.equal(latA, latB);
+  assert.notEqual(latA, lon);
+  assert.ok(latA >= -1 && latA <= 1);
+  assert.ok(lon >= -1 && lon <= 1);
+});