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scripts/test-ledger.js

@@ -403,6 +403,40 @@ async function run() {
       'Adjust must fail when article has no stock tracking',
     );
 
+    // 10b. Test prevention of negative stock on shipment creation and stock adjust
+    console.log('10b. Testing prevention of negative stock on shipment creation and adjust...');
+    const guardOrder = await store.order.create(googleAuthId, {
+      number: 'ORD-GUARD-1',
+      date: '2026-10-20',
+      entityId: customer.id,
+      lines: [{ sku: article.sku, name: 'Order Line', pu: 1, amount: 9999, net: 10, taxrate: 19 }],
+    });
+
+    const currentArt = await store.article.getBySku(googleAuthId, article.sku);
+    const curStock = currentArt.article.warehouses.find((w) => w.id === wh1.id)?.stock ?? 0;
+
+    // Explicit shipment requesting more than available stock must be rejected
+    await assert.rejects(
+      async () => store.shipment.create(googleAuthId, {
+        orderId: guardOrder.id,
+        warehouseId: wh1.id,
+        lines: [{ sku: article.sku, amount: curStock + 10 }],
+      }),
+      /Insufficient stock for article/,
+      'Shipment creation must fail when requested amount exceeds warehouse stock',
+    );
+
+    // Manual stock adjust attempting to deduct more than current stock must be rejected
+    await assert.rejects(
+      async () => store.stock.adjust(googleAuthId, {
+        sku: article.sku,
+        warehouseId: wh1.id,
+        amount: -(curStock + 10),
+      }),
+      /Insufficient stock for article/,
+      'Stock adjust must fail when deduction exceeds available stock',
+    );
+
     // 11. Test before stock tracking is disabled, adjust to 0 has to be ledgerized
     console.log('11. Testing zero-adjustment before stock tracking is disabled...');
     const artBeforeDisable = await store.article.getBySku(googleAuthId, article.sku);