first commit

utils/__tests__/visibility.test.ts

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+import { describe, expect, it } from 'vitest';
+import { isOnOrBeforeVisibleDate, throughVisibleDate } from '../visibility.ts';
+
+describe('throughVisibleDate', () => {
+  const rows = [{ date: '2026-09-05' }, { date: '2026-09-06' }, { date: '2026-09-07' }];
+
+  it('drops rows after the publish cutoff', () => {
+    expect(throughVisibleDate(rows, '2026-09-06')).toEqual([
+      { date: '2026-09-05' },
+      { date: '2026-09-06' },
+    ]);
+  });
+
+  it('returns all rows when cutoff is missing', () => {
+    expect(throughVisibleDate(rows, undefined)).toEqual(rows);
+    expect(throughVisibleDate(rows, null)).toEqual(rows);
+  });
+});
+
+describe('isOnOrBeforeVisibleDate', () => {
+  it('rejects dates after the cutoff', () => {
+    expect(isOnOrBeforeVisibleDate('2026-09-07', '2026-09-06')).toBe(false);
+  });
+
+  it('accepts dates on or before the cutoff', () => {
+    expect(isOnOrBeforeVisibleDate('2026-09-06', '2026-09-06')).toBe(true);
+    expect(isOnOrBeforeVisibleDate('2026-09-05', '2026-09-06')).toBe(true);
+  });
+
+  it('rejects empty dates', () => {
+    expect(isOnOrBeforeVisibleDate(null, '2026-09-06')).toBe(false);
+    expect(isOnOrBeforeVisibleDate(undefined, '2026-09-06')).toBe(false);
+  });
+});