diff --git a/test/server/publications.test.js b/test/server/publications.test.js
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+++ b/test/server/publications.test.js
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+/* eslint-env mocha */
+/* eslint-disable func-names, prefer-arrow-callback */
+/* eslint-disable import/no-absolute-path */
+
+import { expect } from 'chai';
+import { Meteor } from 'meteor/meteor';
+import ActiveFires from '/imports/api/ActiveFires/ActiveFires';
+import ActiveFiresUnion from '/imports/api/ActiveFiresUnion/ActiveFiresUnion';
+import Subscriptions from '/imports/api/Subscriptions/Subscriptions';
+import '/imports/api/ActiveFires/server/publications';
+import '/imports/api/ActiveFiresUnion/server/publications';
+import '/imports/api/Subscriptions/server/publications';
+
+// The map calls these three on every pan and zoom. They are also the publications
+// nobody could change with any confidence, because a wrong bounding box just
+// returns fewer fires and looks like "no fires around here".
+
+const handler = name => Meteor.server.publish_handlers[name];
+
+const runPublication = async (name, context, ...args) => {
+  const result = await handler(name).apply(context, args);
+  return result;
+};
+
+const fireAt = (lat, lon) => ({
+  ourid: { type: 'Point', coordinates: [lon, lat] },
+  lat,
+  lon,
+  type: 'viirs',
+  when: new Date('2026-07-30T05:30:00Z'),
+  scan: 0.5,
+  track: 0.4
+});
+
+// A small square around (lat, lon).
+const squareAt = (lat, lon, size = 0.01) => ({
+  type: 'Polygon',
+  coordinates: [[
+    [lon - size, lat - size],
+    [lon + size, lat - size],
+    [lon + size, lat + size],
+    [lon - size, lat + size],
+    [lon - size, lat - size]
+  ]]
+});
+
+const OVIEDO = { lat: 43.36, lon: -5.84 };
+const MADRID = { lat: 40.41, lon: -3.7 };
+
+// north-east lng/lat, south-west lng/lat, as the client sends them.
+const boxAround = (p, pad = 0.5) => [p.lon + pad, p.lat + pad, p.lon - pad, p.lat - pad];
+
+describe('geo publications', function () {
+  this.timeout(30000);
+
+  beforeEach(async function () {
+    await ActiveFires.removeAsync({});
+    await ActiveFiresUnion.removeAsync({});
+    await Subscriptions.removeAsync({});
+  });
+
+  after(async function () {
+    await ActiveFires.removeAsync({});
+    await ActiveFiresUnion.removeAsync({});
+    await Subscriptions.removeAsync({});
+  });
+
+  describe('activefiresmyloc', function () {
+    it('returns only the fires inside the requested box', async function () {
+      await ActiveFires.insertAsync(fireAt(OVIEDO.lat, OVIEDO.lon));
+      await ActiveFires.insertAsync(fireAt(MADRID.lat, MADRID.lon));
+
+      const cursor = await runPublication('activefiresmyloc', { userId: null }, ...boxAround(OVIEDO), false);
+      const fires = await cursor.fetchAsync();
+
+      expect(fires).to.have.lengthOf(1);
+      expect(fires[0].lat).to.equal(OVIEDO.lat);
+    });
+
+    it('publishes only the fields the map needs', async function () {
+      await ActiveFires.insertAsync(fireAt(OVIEDO.lat, OVIEDO.lon));
+
+      const cursor = await runPublication('activefiresmyloc', { userId: null }, ...boxAround(OVIEDO), false);
+      const [fire] = await cursor.fetchAsync();
+
+      expect(Object.keys(fire).sort()).to.deep.equal(['_id', 'lat', 'lon', 'scan', 'track', 'when']);
+    });
+
+    it('returns nothing for a box with no fires in it', async function () {
+      await ActiveFires.insertAsync(fireAt(MADRID.lat, MADRID.lon));
+
+      const cursor = await runPublication('activefiresmyloc', { userId: null }, ...boxAround(OVIEDO), false);
+      expect(await cursor.countAsync()).to.equal(0);
+    });
+
+    it('refuses coordinates outside the world', async function () {
+      let threw = false;
+      try {
+        await runPublication('activefiresmyloc', { userId: null }, 200, 10, -200, -10, false);
+      } catch (e) {
+        threw = true;
+      }
+      expect(threw, 'a longitude of 200 was accepted').to.equal(true);
+    });
+
+    it('refuses a non-boolean withMarks', async function () {
+      let threw = false;
+      try {
+        await runPublication('activefiresmyloc', { userId: null }, ...boxAround(OVIEDO), 'yes');
+      } catch (e) {
+        threw = true;
+      }
+      expect(threw).to.equal(true);
+    });
+  });
+
+  describe('activefiresunionmyloc', function () {
+    it('returns the union shapes that intersect the box', async function () {
+      await ActiveFiresUnion.insertAsync({
+        centerid: { type: 'Point', coordinates: [OVIEDO.lon, OVIEDO.lat] },
+        shape: squareAt(OVIEDO.lat, OVIEDO.lon),
+        when: new Date('2026-07-30T05:30:00Z')
+      });
+      await ActiveFiresUnion.insertAsync({
+        centerid: { type: 'Point', coordinates: [MADRID.lon, MADRID.lat] },
+        shape: squareAt(MADRID.lat, MADRID.lon),
+        when: new Date('2026-07-30T05:30:00Z')
+      });
+
+      const cursor = await runPublication('activefiresunionmyloc', { userId: null }, ...boxAround(OVIEDO), false);
+      const unions = await cursor.fetchAsync();
+
+      expect(unions).to.have.lengthOf(1);
+      expect(unions[0].centerid.coordinates[0]).to.equal(OVIEDO.lon);
+    });
+
+    // $geoIntersects, not $geoWithin: a shape bigger than the viewport still has
+    // to be drawn, which is exactly what a zoomed-in user sees.
+    it('returns a shape that only partially overlaps the box', async function () {
+      await ActiveFiresUnion.insertAsync({
+        centerid: { type: 'Point', coordinates: [OVIEDO.lon, OVIEDO.lat] },
+        shape: squareAt(OVIEDO.lat, OVIEDO.lon, 2),
+        when: new Date('2026-07-30T05:30:00Z')
+      });
+
+      const cursor = await runPublication('activefiresunionmyloc', { userId: null }, ...boxAround(OVIEDO, 0.1), false);
+      expect(await cursor.countAsync()).to.equal(1);
+    });
+
+    it('returns nothing for a box far from every shape', async function () {
+      await ActiveFiresUnion.insertAsync({
+        centerid: { type: 'Point', coordinates: [MADRID.lon, MADRID.lat] },
+        shape: squareAt(MADRID.lat, MADRID.lon),
+        when: new Date('2026-07-30T05:30:00Z')
+      });
+
+      const cursor = await runPublication('activefiresunionmyloc', { userId: null }, ...boxAround(OVIEDO), false);
+      expect(await cursor.countAsync()).to.equal(0);
+    });
+
+    it('refuses coordinates outside the world', async function () {
+      let threw = false;
+      try {
+        await runPublication('activefiresunionmyloc', { userId: null }, 10, 100, -10, -100, false);
+      } catch (e) {
+        threw = true;
+      }
+      expect(threw).to.equal(true);
+    });
+  });
+
+  describe('mysubscriptions', function () {
+    const subFor = (owner, lat, lon) => ({
+      location: { lat, lon },
+      geo: { type: 'Point', coordinates: [lon, lat] },
+      distance: 10,
+      owner,
+      type: 'web'
+    });
+
+    it('publishes only the subscriptions of the logged-in user', async function () {
+      await Subscriptions.insertAsync(subFor('user-a', OVIEDO.lat, OVIEDO.lon));
+      await Subscriptions.insertAsync(subFor('user-a', MADRID.lat, MADRID.lon));
+      await Subscriptions.insertAsync(subFor('user-b', MADRID.lat, MADRID.lon));
+
+      const cursor = await runPublication('mysubscriptions', { userId: 'user-a' });
+      const subs = await cursor.fetchAsync();
+
+      expect(subs).to.have.lengthOf(2);
+      subs.forEach(s => expect(s.owner).to.equal('user-a'));
+    });
+
+    it('publishes nothing to an anonymous visitor', async function () {
+      await Subscriptions.insertAsync(subFor('user-a', OVIEDO.lat, OVIEDO.lon));
+
+      const cursor = await runPublication('mysubscriptions', { userId: null });
+      expect(await cursor.countAsync()).to.equal(0);
+    });
+  });
+});