diff --git a/tests/Feature/Cart/CartControllerTest.php b/tests/Feature/Cart/CartControllerTest.php
index 382f96d..38a75af 100644
--- a/tests/Feature/Cart/CartControllerTest.php
+++ b/tests/Feature/Cart/CartControllerTest.php
@@ -190,20 +190,28 @@ class CartControllerTest extends TestCase
     {
         config()->set('catalog.stock_reservation_expiration_minutes', 30);
         $tenant = $this->createTenant('acme');
+        $user = User::factory()->create();
         $item = $this->createDirectItem($tenant, 10, '49.90');
 
-        $response = $this->postJson('/api/tenants/acme/cart/items', [
-            'catalog_item_id' => $item->id,
-            'cantidad' => 2,
-        ])->assertOk();
+        $response = $this->actingAs($user, 'sanctum')
+            ->postJson('/api/tenants/acme/cart/items', [
+                'catalog_item_id' => $item->id,
+                'cantidad' => 2,
+            ])->assertOk();
         $cartId = $response->json('data.id');
         $cartItemId = $response->json('data.items.0.id');
+        $cart = Cart::query()->findOrFail($cartId);
+        $reservationId = $cart->current_stock_reservation_id;
 
         $this->artisan('reservations:expire')
             ->expectsOutput('Expired purchases: 0')
             ->expectsOutput('Expired cart reservations: 0')
             ->assertSuccessful();
 
+        $this->postJson('/api/tenants/acme/cart/restart')
+            ->assertUnprocessable()
+            ->assertJsonValidationErrors('cart');
+
         $this->travel(31)->minutes();
 
         $this->artisan('reservations:expire')
@@ -220,10 +228,11 @@ class CartControllerTest extends TestCase
         $this->assertDatabaseHas('carritos', [
             'id' => $cartId,
             'status' => 'active',
-            'current_stock_reservation_id' => null,
+            'current_stock_reservation_id' => $reservationId,
             'deleted_at' => null,
         ]);
         $this->assertDatabaseHas('stock_reservations', [
+            'id' => $reservationId,
             'status' => 'expired',
             'expires_at' => null,
         ]);
@@ -232,6 +241,36 @@ class CartControllerTest extends TestCase
             'quantity' => 2,
         ]);
 
+        $this->postJson('/api/tenants/acme/cart/items', [
+            'catalog_item_id' => $item->id,
+            'cantidad' => 1,
+        ])
+            ->assertUnprocessable()
+            ->assertExactJson([
+                'code' => 'stock_reservation.expired',
+                'message' => __('api.cart.reservation_expired'),
+            ]);
+
+        $restart = $this->postJson('/api/tenants/acme/cart/restart')
+            ->assertOk()
+            ->assertJsonPath('code', 'cart.restarted')
+            ->assertJsonPath('data.items', [])
+            ->assertJsonMissingPath('data.stock_reservation')
+            ->assertJsonMissingPath('data.current_stock_reservation_id');
+        $newCartId = $restart->json('data.id');
+
+        $this->assertNotSame($cartId, $newCartId);
+        $this->assertDatabaseHas('carritos', [
+            'id' => $cartId,
+            'status' => 'abandoned',
+            'current_stock_reservation_id' => $reservationId,
+        ]);
+        $this->assertDatabaseHas('carritos', [
+            'id' => $newCartId,
+            'status' => 'active',
+            'current_stock_reservation_id' => null,
+        ]);
+
         $this->artisan('reservations:expire')
             ->expectsOutput('Expired purchases: 0')
             ->expectsOutput('Expired cart reservations: 0')
diff --git a/tests/Feature/Purchase/StorePurchaseTest.php b/tests/Feature/Purchase/StorePurchaseTest.php
index e882f57..5ea8732 100644
--- a/tests/Feature/Purchase/StorePurchaseTest.php
+++ b/tests/Feature/Purchase/StorePurchaseTest.php
@@ -71,6 +71,43 @@ class StorePurchaseTest extends TestCase
         $this->travelBack();
     }
 
+    public function test_checkout_cannot_replace_an_overdue_cart_reservation(): void
+    {
+        $tenant = $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
+        $user = User::factory()->create();
+        $variant = $this->createVariantForTenant('sonder', 10, '50.00');
+        $cart = Cart::query()->create([
+            'tenant_codigo' => $tenant->codigo,
+            'user_id' => $user->id,
+            'status' => 'active',
+        ]);
+        $cart->addItem($variant->catalog_item_id, $variant->id, 2);
+        $reservationId = $cart->fresh()->current_stock_reservation_id;
+        $expiredAt = now()->subMinute()->startOfSecond();
+        $cart->currentStockReservation()->update(['expires_at' => $expiredAt]);
+
+        $this->actingAs($user, 'sanctum')
+            ->postJson('/api/tenants/sonder/compras/start-checkout', [
+                'cart_id' => $cart->id,
+            ])
+            ->assertUnprocessable()
+            ->assertExactJson([
+                'code' => 'stock_reservation.expired',
+                'message' => __('api.cart.reservation_expired'),
+            ]);
+
+        $this->assertDatabaseCount('compras', 0);
+        $this->assertDatabaseHas('stock_reservations', [
+            'id' => $reservationId,
+            'status' => 'active',
+            'expires_at' => $expiredAt->toDateTimeString(),
+        ]);
+        $this->assertDatabaseHas('carritos', [
+            'id' => $cart->id,
+            'current_stock_reservation_id' => $reservationId,
+        ]);
+    }
+
     public function test_it_starts_checkout_from_cart_with_purchase_item_snapshots(): void
     {
         $tenant = $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
@@ -480,6 +517,7 @@ class StorePurchaseTest extends TestCase
         $user = User::factory()->create();
         $variant = $this->createVariantForTenant('sonder', 10, '50.00');
         $purchase = $this->createCheckoutPurchase($user, 'sonder', $variant, 3);
+        $reservationId = $purchase->stock_reservation_id;
         $activeCart = Cart::query()
             ->where('user_id', $user->id)
             ->where('status', 'active')
@@ -513,7 +551,11 @@ class StorePurchaseTest extends TestCase
             'reserved_stock' => 3,
         ]);
         $activeCart->refresh();
-        $this->assertNotNull($activeCart->current_stock_reservation_id);
+        $this->assertSame($reservationId, $activeCart->current_stock_reservation_id);
+        $this->assertDatabaseHas('compras', [
+            'id' => $purchase->id,
+            'stock_reservation_id' => null,
+        ]);
         $this->assertDatabaseHas('stock_reservations', [
             'id' => $activeCart->current_stock_reservation_id,
             'status' => 'active',
@@ -526,7 +568,7 @@ class StorePurchaseTest extends TestCase
         $this->assertSame(1, $activeCart->items()->count());
     }
 
-    public function test_it_reassigns_a_terminal_purchase_reservation_and_rejects_a_late_confirmation(): void
+    public function test_it_reuses_the_cart_reservation_for_a_new_checkout_and_rejects_a_late_confirmation(): void
     {
         $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
         $user = User::factory()->create();
@@ -554,11 +596,15 @@ class StorePurchaseTest extends TestCase
             'id' => $cart->id,
             'current_purchase_id' => $currentPurchase->id,
         ]);
-        $this->assertNotSame($previousReservationId, $currentPurchase->stock_reservation_id);
+        $this->assertSame($previousReservationId, $currentPurchase->stock_reservation_id);
+        $this->assertDatabaseHas('compras', [
+            'id' => $previousPurchase->id,
+            'stock_reservation_id' => null,
+        ]);
         $this->assertDatabaseHas('stock_reservations', [
             'id' => $previousReservationId,
-            'status' => 'released',
-            'release_reason' => 'purchase_superseded',
+            'status' => 'active',
+            'release_reason' => null,
         ]);
         $this->assertPurchaseReservation($currentPurchase->id, $variant->inventory_id, 2, 'active');
 
@@ -604,7 +650,7 @@ class StorePurchaseTest extends TestCase
         ]);
         $this->assertDatabaseHas('stock_reservations', [
             'status' => 'released',
-            'release_reason' => 'purchase_superseded',
+            'release_reason' => 'cart_empty',
         ]);
         $this->assertDatabaseHas('stock_reservation_lines', [
             'inventory_id' => $variant->inventory_id,
@@ -654,6 +700,38 @@ class StorePurchaseTest extends TestCase
         ]);
         $this->assertPurchaseReservation($purchase->id, $variant->inventory_id, 3, 'expired');
         $this->assertSame(1, $activeCart->items()->count());
+
+        $this->actingAs($user, 'sanctum')
+            ->postJson("/api/tenants/sonder/compras/{$purchase->id}/cancel")
+            ->assertUnprocessable()
+            ->assertJsonPath('code', 'purchase.expired');
+    }
+
+    public function test_an_overdue_purchase_cannot_be_cancelled_before_the_expiration_job_runs(): void
+    {
+        $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
+        $user = User::factory()->create();
+        $variant = $this->createVariantForTenant('sonder', 10, '50.00');
+        $purchase = $this->createCheckoutPurchase($user, 'sonder', $variant, 1);
+        $purchase->stockReservation()->update(['expires_at' => now()->subMinute()]);
+
+        $this->actingAs($user, 'sanctum')
+            ->postJson("/api/tenants/sonder/compras/{$purchase->id}/cancel")
+            ->assertUnprocessable()
+            ->assertExactJson([
+                'code' => 'stock_reservation.expired',
+                'message' => __('api.cart.reservation_expired'),
+            ]);
+
+        $this->assertDatabaseHas('compras', [
+            'id' => $purchase->id,
+            'status' => Purchase::STATUS_CREATED,
+            'stock_reservation_id' => $purchase->stock_reservation_id,
+        ]);
+        $this->assertDatabaseHas('stock_reservations', [
+            'id' => $purchase->stock_reservation_id,
+            'status' => 'active',
+        ]);
     }
 
     public function test_it_keeps_cart_items_during_checkout_and_updates_customer_data(): void