Load places based on map bounds

tests/unit/utils/geohash-coverage-test.js

@@ -0,0 +1,50 @@
+import { module, test } from 'qunit';
+import { setupTest } from 'ember-qunit';
+import { getGeohashPrefixesInBbox } from 'marco/utils/geohash-coverage';
+
+module('Unit | Utility | geohash-coverage', function (hooks) {
+  setupTest(hooks);
+
+  test('it returns correct prefixes for a small bounding box', function (assert) {
+    // A small area in Berlin (approx)
+    // 4-char geohash for Berlin is roughly 'u33d'
+    // lat ~ 52.5, lon ~ 13.4
+    const bbox = {
+      minLat: 52.51,
+      minLon: 13.38,
+      maxLat: 52.52,
+      maxLon: 13.4,
+    };
+
+    // Precision 4
+    const prefixes = getGeohashPrefixesInBbox(bbox);
+
+    assert.ok(prefixes.length > 0, 'Should return prefixes');
+    assert.ok(
+      prefixes.every((p) => p.length === 4),
+      'Prefixes should be 4 chars long'
+    );
+    // We expect 'u33d' to be in there or neighbors
+    // Berlin Alexanderplatz is u33dc1
+    assert.ok(
+      prefixes.some((p) => p.startsWith('u33')),
+      'Should contain Berlin region prefix'
+    );
+  });
+
+  test('it handles cases where steps might miss a small edge', function (assert) {
+    // A bbox that is exactly one point
+    const bbox = {
+      minLat: 50.0,
+      minLon: 10.0,
+      maxLat: 50.0,
+      maxLon: 10.0,
+    };
+    const prefixes = getGeohashPrefixesInBbox(bbox);
+    assert.strictEqual(
+      prefixes.length,
+      1,
+      'Single point should result in 1 prefix'
+    );
+  });
+});