Initial import of zappier-edge from zapier monorepo

tests/db-invoice.test.ts

@@ -0,0 +1,72 @@
+import Database from 'better-sqlite3';
+import { Invoice } from '../src/invoicing';
+import { SqliteInvoiceRepo } from '../src/db/invoice-repo';
+
+const invoice = (overrides: Partial<Invoice> = {}): Invoice => ({
+  id: 'INV-2026-07-0001',
+  customerId: 'cust_2',
+  period: '2026-07',
+  status: 'draft',
+  lines: [{ endpointId: 'storage', calls: 2, cents: 1500 }],
+  totalCents: 1500,
+  creditCents: 1000,
+  billableCents: 500,
+  billingType: 'stripe',
+  ...overrides,
+});
+
+describe('SqliteInvoiceRepo', () => {
+  it('saves and retrieves an invoice with its lines', () => {
+    const repo = new SqliteInvoiceRepo(new Database(':memory:'));
+    repo.save(invoice());
+    const got = repo.get('INV-2026-07-0001');
+    expect(got?.billableCents).toBe(500);
+    expect(got?.lines).toEqual([{ endpointId: 'storage', calls: 2, cents: 1500 }]);
+  });
+
+  it('re-saving an invoice replaces its lines (draft regeneration)', () => {
+    const repo = new SqliteInvoiceRepo(new Database(':memory:'));
+    repo.save(invoice());
+    repo.save(invoice({ lines: [{ endpointId: 'transform', calls: 5, cents: 20 }], totalCents: 20 }));
+    const got = repo.get('INV-2026-07-0001');
+    expect(got?.lines).toEqual([{ endpointId: 'transform', calls: 5, cents: 20 }]);
+    expect(repo.list({})).toHaveLength(1);
+  });
+
+  it('filters by customer, period, and status', () => {
+    const repo = new SqliteInvoiceRepo(new Database(':memory:'));
+    repo.save(invoice());
+    repo.save(invoice({ id: 'INV-2026-07-0002', customerId: 'cust_3', status: 'issued' }));
+    repo.save(invoice({ id: 'INV-2026-08-0001', period: '2026-08' }));
+    expect(repo.list({ customerId: 'cust_3' })).toHaveLength(1);
+    expect(repo.list({ period: '2026-08' })).toHaveLength(1);
+    expect(repo.list({ status: 'issued' })).toHaveLength(1);
+    expect(repo.list({ period: '2026-07' })).toHaveLength(2);
+    expect(repo.list({})).toHaveLength(3);
+  });
+
+  it('increments sequences per period independently', () => {
+    const repo = new SqliteInvoiceRepo(new Database(':memory:'));
+    expect(repo.nextSequence('2026-07')).toBe(1);
+    repo.save(invoice());
+    expect(repo.nextSequence('2026-07')).toBe(2);
+    expect(repo.nextSequence('2026-08')).toBe(1);
+  });
+
+  it('persists lifecycle timestamps and PO numbers', () => {
+    const repo = new SqliteInvoiceRepo(new Database(':memory:'));
+    repo.save(
+      invoice({
+        billingType: 'purchase_order',
+        poNumber: 'PO-1',
+        status: 'issued',
+        issuedAtMs: 1000,
+        dueAtMs: 2000,
+      }),
+    );
+    const got = repo.get('INV-2026-07-0001');
+    expect(got?.poNumber).toBe('PO-1');
+    expect(got?.issuedAtMs).toBe(1000);
+    expect(got?.dueAtMs).toBe(2000);
+  });
+});