216 lines
9.6 KiB
JavaScript
216 lines
9.6 KiB
JavaScript
import { calculateDrivingDistance, calculateTotalCharge, getLastRouteDurationMin } from '@/lib/distance';
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/**
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* Distance and charge for a delivery leg.
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*
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* OSRM is the routed source; the Haversine + 1.3 multiplier is the fallback.
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* The behaviour that matters commercially is that the fallback NEVER reports a
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* duration — a straight-line estimate has no honest ETA, and showing a made-up
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* one to an operator is worse than showing none.
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*/
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const osrmOk = (distanceMeters, durationSeconds) => ({
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ok: true,
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json: async () => ({ routes: [{ distance: distanceMeters, duration: durationSeconds }] })
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});
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const BLR = { latitude: 12.9716, longitude: 77.5946 };
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const IND = { latitude: 12.9352, longitude: 77.6245 };
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describe('calculateDrivingDistance', () => {
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beforeEach(() => {
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global.fetch = jest.fn();
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});
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describe('coordinate validation', () => {
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it.each([
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['a missing origin latitude', { longitude: 77.5946 }, IND],
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['a missing origin longitude', { latitude: 12.9716 }, IND],
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['a missing destination latitude', BLR, { longitude: 77.6245 }],
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['a missing destination longitude', BLR, { latitude: 12.9352 }],
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['a null origin', null, IND],
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['an undefined destination', BLR, undefined],
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['a null latitude value', { latitude: null, longitude: 77.5946 }, IND]
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])('should reject %s', async (_label, origin, destination) => {
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await expect(calculateDrivingDistance(origin, destination)).rejects.toThrow('Invalid coordinates');
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expect(global.fetch).not.toHaveBeenCalled();
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});
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it('should reject zero coordinates, which are only ever a failed geocode', async () => {
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// This assertion is INVERTED from what it used to say, and the reason is
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// that the old pair of expectations could not both hold.
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//
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// The case above requires a null latitude to be rejected. `Number(null)`
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// is 0, so to any guard built on Number() a null latitude and a zero
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// latitude are the same value — there is no implementation that rejects
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// one and accepts the other. The old code accepted both, which is why
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// "should reject a null latitude value" was failing on main.
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//
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// So it is a choice, and zero loses. Geographically (0, 0) is a real
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// point in the Gulf of Guinea; in this product it is not reachable —
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// Doormile operates inside the India bounding box (latitude 6.5 to 37.5,
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// longitude 68 to 97.5, see geocodingService.isWithinIndia) and every
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// zero coordinate ever seen in production was the residue of a geocode
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// that failed. Accepting them cost real money: OSRM has no route to open
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// ocean, so the Haversine fallback measured a Coimbatore pickup at
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// roughly 11,000 km, and the backend honours that as the order's price.
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global.fetch.mockResolvedValue(osrmOk(1000, 120));
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await expect(
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calculateDrivingDistance({ latitude: 0, longitude: 0 }, { latitude: 0, longitude: 1 })
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).rejects.toThrow('Invalid coordinates');
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expect(global.fetch).not.toHaveBeenCalled();
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});
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it('should reject a coordinate outside its own axis range', async () => {
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// Nothing in the console checked this before. Note the limit: this
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// catches a longitude read as a latitude only when it exceeds 90, so a
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// transposed Coimbatore pin (11.0168, 76.9558) still passes. See
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// lib/coords for why, and what would actually catch it.
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await expect(
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calculateDrivingDistance({ latitude: 94.912, longitude: 27.4728 }, IND)
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).rejects.toThrow('Invalid coordinates');
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expect(global.fetch).not.toHaveBeenCalled();
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});
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});
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describe('OSRM routed distance', () => {
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it('should return the routed distance rounded to whole kilometres', async () => {
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global.fetch.mockResolvedValue(osrmOk(8200, 900));
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await expect(calculateDrivingDistance(BLR, IND)).resolves.toBe(8);
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});
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it('should cache the routed duration in whole minutes', async () => {
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global.fetch.mockResolvedValue(osrmOk(8200, 900));
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await calculateDrivingDistance(BLR, IND);
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expect(getLastRouteDurationMin()).toBe(15);
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});
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it('should request lon,lat order — the order OSRM expects', async () => {
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// Swapping to lat,lon silently returns a route between two other places.
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global.fetch.mockResolvedValue(osrmOk(8200, 900));
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await calculateDrivingDistance(BLR, IND);
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const url = global.fetch.mock.calls[0][0];
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expect(url).toContain('/route/v1/driving/77.5946,12.9716;77.6245,12.9352');
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// The route geometry IS requested: `calculateDrivingRoute` returns a
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// polyline for the live map preview, so this asks for overview=full with
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// geojson geometry. It read `overview=false` until the polyline landed.
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expect(url).toContain('overview=full');
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expect(url).toContain('geometries=geojson');
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});
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it('should use the public OSRM host by default', async () => {
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global.fetch.mockResolvedValue(osrmOk(8200, 900));
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await calculateDrivingDistance(BLR, IND);
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expect(global.fetch.mock.calls[0][0]).toContain('https://router.project-osrm.org');
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});
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it('should honour a VITE_OSRM_URL override for a self-hosted router', async () => {
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globalThis.__VITE_IMPORT_META__ = { env: { VITE_OSRM_URL: 'http://osrm.internal:5000' } };
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global.fetch.mockResolvedValue(osrmOk(8200, 900));
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let reloaded;
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jest.isolateModules(() => {
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// eslint-disable-next-line global-require
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reloaded = require('@/lib/distance').calculateDrivingDistance;
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});
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await reloaded(BLR, IND);
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expect(global.fetch.mock.calls[0][0]).toContain('http://osrm.internal:5000');
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});
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it('should report no duration when OSRM omits one', async () => {
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global.fetch.mockResolvedValue({ ok: true, json: async () => ({ routes: [{ distance: 8200 }] }) });
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await calculateDrivingDistance(BLR, IND);
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expect(getLastRouteDurationMin()).toBeNull();
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});
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});
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describe('Haversine fallback', () => {
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it('should fall back when OSRM answers with an error status', async () => {
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global.fetch.mockResolvedValue({ ok: false, status: 502, json: async () => ({}) });
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const distance = await calculateDrivingDistance(BLR, IND);
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expect(distance).toEqual(expect.any(Number));
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expect(distance).toBeGreaterThan(0);
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});
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it('should fall back when the network call throws', async () => {
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const warn = jest.spyOn(console, 'warn').mockImplementation(() => {});
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global.fetch.mockRejectedValue(new Error('ECONNREFUSED'));
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await expect(calculateDrivingDistance(BLR, IND)).resolves.toEqual(expect.any(Number));
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expect(warn).toHaveBeenCalled();
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});
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it('should fall back when OSRM returns no routes', async () => {
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global.fetch.mockResolvedValue({ ok: true, json: async () => ({ routes: [] }) });
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await expect(calculateDrivingDistance(BLR, IND)).resolves.toEqual(expect.any(Number));
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});
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it('should apply the 1.3 road multiplier to the straight-line distance', async () => {
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// One degree of latitude is 111.19 km great-circle; x1.3 = 144.5 -> 145.
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// Measured along a meridian over India rather than from (0, 0): the
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// arithmetic is identical at any longitude, and zero coordinates are now
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// refused before the fetch.
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global.fetch.mockResolvedValue({ ok: false, json: async () => ({}) });
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const distance = await calculateDrivingDistance(
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{ latitude: 10, longitude: 77 },
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{ latitude: 11, longitude: 77 }
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);
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expect(distance).toBe(145);
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});
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it('should return zero for two identical points', async () => {
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global.fetch.mockResolvedValue({ ok: false, json: async () => ({}) });
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await expect(calculateDrivingDistance(BLR, { ...BLR })).resolves.toBe(0);
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});
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it('should report NO duration for a fallback estimate', async () => {
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// A straight-line guess has no honest ETA. Leaving a stale routed value
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// in place would attach a real-looking duration to a fabricated distance.
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global.fetch.mockResolvedValueOnce(osrmOk(8200, 900));
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await calculateDrivingDistance(BLR, IND);
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expect(getLastRouteDurationMin()).toBe(15);
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global.fetch.mockResolvedValueOnce({ ok: false, json: async () => ({}) });
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await calculateDrivingDistance(BLR, IND);
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expect(getLastRouteDurationMin()).toBeNull();
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});
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it('should be symmetric — the distance does not depend on direction', async () => {
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global.fetch.mockResolvedValue({ ok: false, json: async () => ({}) });
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const there = await calculateDrivingDistance(BLR, IND);
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const back = await calculateDrivingDistance(IND, BLR);
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expect(there).toBe(back);
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});
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});
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});
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describe('calculateTotalCharge', () => {
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it('should charge only the base price below the minimum distance', () => {
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expect(calculateTotalCharge(3, 30, 6, 8)).toBe(30);
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});
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it('should charge only the base price at exactly the minimum distance', () => {
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// Boundary: minKm is inclusive of the base fare.
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expect(calculateTotalCharge(8, 30, 6, 8)).toBe(30);
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});
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it('should add the per-km rate beyond the minimum', () => {
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expect(calculateTotalCharge(12, 30, 6, 8)).toBe(54);
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});
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it('should add a partial kilometre proportionally', () => {
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expect(calculateTotalCharge(8.5, 30, 6, 8)).toBeCloseTo(33, 6);
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});
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it('should charge the base price for a zero-distance leg', () => {
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expect(calculateTotalCharge(0, 30, 6, 8)).toBe(30);
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});
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it('should charge the base price when there is no minimum', () => {
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expect(calculateTotalCharge(0, 30, 6, 0)).toBe(30);
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});
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it('should scale linearly for a long leg', () => {
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expect(calculateTotalCharge(108, 30, 6, 8)).toBe(630);
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});
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});
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