auto allocation and batch managemnt, tracking the train

apps/edr-freight-api/src/modules/train-scheduling/batch-window.util.spec.ts

@@ -0,0 +1,52 @@
+import {
+  getBatchWindowForTimestamp,
+  listBatchWindowsForDate,
+  listBatchWindowsForBookings,
+  BATCH_WINDOW_START_HOURS,
+} from './batch-window.util';
+
+describe('batch-window.util', () => {
+  it('maps 20:15 EAT to the 19:00–22:00 window', () => {
+    // 20:15 EAT = 17:15 UTC on 11 Jun 2026
+    const ts = new Date('2026-06-11T17:15:00.000Z');
+    const window = getBatchWindowForTimestamp(ts);
+
+    expect(window.label).toContain('19:00');
+    expect(window.label).toContain('22:00');
+    expect(window.label).toContain('11 Jun 2026');
+  });
+
+  it('maps 08:30 EAT to the 07:00–10:00 window', () => {
+    const ts = new Date('2026-06-11T05:30:00.000Z'); // 08:30 EAT
+    const window = getBatchWindowForTimestamp(ts);
+    expect(window.label).toContain('07:00');
+    expect(window.label).toContain('10:00');
+  });
+
+  it('maps 02:00 EAT to the previous day 22:00–07:00 window', () => {
+    const ts = new Date('2026-06-11T23:00:00.000Z'); // 02:00 EAT on 12 Jun
+    const window = getBatchWindowForTimestamp(ts);
+    expect(window.label).toContain('22:00');
+    expect(window.label).toContain('07:00');
+    expect(window.label).toContain('11 Jun 2026');
+  });
+
+  it('lists six windows for a calendar day', () => {
+    const ref = new Date('2026-06-11T12:00:00.000Z');
+    const windows = listBatchWindowsForDate(ref);
+    expect(windows).toHaveLength(BATCH_WINDOW_START_HOURS.length);
+    expect(windows[0].label).toContain('07:00');
+    expect(windows[windows.length - 1].label).toContain('22:00');
+  });
+
+  it('includes cross-day overnight window when booking signed at 00:02 EAT', () => {
+    // 21:02 UTC = 00:02 EAT on 12 Jun → belongs to 11 Jun 22:00–07:00 window
+    const fullyExecutedAt = new Date('2026-06-11T21:02:05.153Z');
+    const scheduleDate = new Date('2026-06-12T06:00:00.000Z');
+    const windows = listBatchWindowsForBookings([fullyExecutedAt], scheduleDate);
+    const overnight = windows.find((w) => w.label.includes('22:00') && w.label.includes('07:00'));
+    expect(overnight).toBeDefined();
+    expect(overnight!.label).toContain('11 Jun 2026');
+    expect(getBatchWindowForTimestamp(fullyExecutedAt).key).toBe(overnight!.key);
+  });
+});