Unit tests for cache

src/state/cache.test.ts

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+import { cache } from "./cache";
+import { expect } from "chai";
+
+describe("cache", () => {
+  it('should be empty for unloaded tiles', () => {
+    cache.getFeatures("16/18109/23965").then((result) => {
+      expect(result.length).to.equal(0);
+    });
+  });
+
+  it('should store and retrieve features', () => {
+    // Real feature extracted from tile
+    cache.addFeature({
+      "feature_type": "amenity",
+      "feature_value": "cafe",
+      "geometry": {
+        "coordinates": [-80.52166, 43.463198],
+        "type": "Point"
+      },
+      "osm_ids": [503048818],
+      "properties": {
+        "amenity": "cafe",
+        "cuisine": "bubble_tea",
+        "name": "The Bingsu"
+      },
+      "type": "Feature"
+    },
+    "16/18109/23965");
+
+    cache.getFeatures("16/18109/23965").then((result) => {
+      expect(result.length).to.equal(1);
+      expect(result[0]).to.include({
+        "feature_type": "amenity",
+        "feature_value": "cafe",  
+      });
+    });
+  });
+});