Refactor example app and add location tracking functionality with tests

packages/map-sdk/src/hooks/__tests__/useLocationTracking.test.tsx

@@ -0,0 +1,48 @@
+require('react-test-renderer');
+const { renderHook, act } = require('@testing-library/react-hooks');
+const { useLocationTracking } = require('../useLocationTracking');
+
+describe('useLocationTracking', () => {
+    let origGeo;
+
+    beforeEach(() => {
+        origGeo = global.navigator && global.navigator.geolocation;
+        global.navigator = global.navigator || {};
+        global.navigator.geolocation = {
+            watchPosition: jest.fn((success) => {
+                // Immediately call with a sample position
+                success({ coords: { latitude: 10, longitude: 20 } });
+                // Return a fake id
+                return 42;
+            }),
+            clearWatch: jest.fn()
+        };
+    });
+
+    afterEach(() => {
+        if (origGeo) global.navigator.geolocation = origGeo;
+        else delete global.navigator.geolocation;
+        jest.resetAllMocks();
+    });
+
+    it('starts and stops tracking and collects path', () => {
+        const { result } = renderHook(() => useLocationTracking());
+
+        expect(result.current.isTracking).toBe(false);
+        act(() => result.current.startTracking());
+        expect(result.current.isTracking).toBe(true);
+        expect(result.current.path.length).toBeGreaterThanOrEqual(1);
+
+        act(() => result.current.stopTracking());
+        expect(result.current.isTracking).toBe(false);
+        expect(global.navigator.geolocation.clearWatch).toHaveBeenCalled();
+    });
+
+    it('clears path', () => {
+        const { result } = renderHook(() => useLocationTracking());
+        act(() => result.current.startTracking());
+        expect(result.current.path.length).toBeGreaterThanOrEqual(1);
+        act(() => result.current.clear());
+        expect(result.current.path.length).toBe(0);
+    });
+});