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test/stopGroups.test.mjs

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+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { countLabel, directionLabel, groupStops } from '../src/lib/stopGroups.ts';
+
+test('names are grouped like the landing while direction IDs remain independent', () => {
+  const groups = groupStops([
+    { id: 1, name: '  Площадь   Свободы ', direction: 'В центр', routesCount: 2 },
+    { id: 2, name: 'площадь свободы', direction: 'Из центра', routesCount: 3 },
+    { id: 1, name: 'Площадь Свободы', direction: 'Duplicate ID', routesCount: 2 },
+    { id: 3, name: 'Автовокзал', direction: '', routesCount: 1 },
+  ]);
+  assert.equal(groups.length, 2);
+  assert.equal(groups[0].name, 'Автовокзал');
+  assert.equal(groups[1].name, 'Площадь Свободы');
+  assert.deepEqual(groups[1].stops.map(stop => stop.id), [1, 2]);
+});
+
+test('direction labels distinguish unlabeled and repeated directions', () => {
+  const stops = [
+    { id: 1, name: 'Вокзал', direction: 'В центр', routesCount: 2 },
+    { id: 2, name: 'Вокзал', direction: 'В центр', routesCount: 2 },
+    { id: 3, name: 'Вокзал', direction: '', routesCount: 2 },
+  ];
+  const group = groupStops(stops)[0];
+  assert.equal(directionLabel(group, stops[0], 0), 'В центр · 1');
+  assert.equal(directionLabel(group, stops[1], 1), 'В центр · 2');
+  assert.equal(directionLabel(group, stops[2], 2), 'Направление 3');
+});
+
+test('the list retains more than eighty stops and uses correct count labels', () => {
+  const stops = Array.from({ length: 120 }, (_, index) => ({ id: index + 1, name: `Остановка ${index + 1}`, direction: '', routesCount: 1 }));
+  assert.equal(groupStops(stops).length, 120);
+  const forms = ['остановка', 'остановки', 'остановок'];
+  assert.equal(countLabel(1, forms), '1 остановка');
+  assert.equal(countLabel(2, forms), '2 остановки');
+  assert.equal(countLabel(11, forms), '11 остановок');
+  assert.equal(countLabel(21, forms), '21 остановка');
+});