Laravel introduces new test helpers to control deferred operation execution, allowing developers to test deferred functions without waiting for the request lifecycle to complete.

Control deferred execution in your tests:

// triggered deferred operations won't execute immediately
Product::create(['name' => 'Widget']);
$this->assertAgainstSomeDeferredOutcome(); // ❌ Fails
// triggered deferred operations execute immediately
$this->withoutDefer();
Product::create(['name' => 'Widget']);
$this->assertAgainstSomeDeferredOutcome(); // ✅ Passes

Here's how you might use it in your test suite:

class OrderProcessingTest extends TestCase
{
 public function test_confirmation_email_is_queued_after_order()
 {
 Mail::fake();
 $this->withoutDefer();
 $order = Order::create([
 'customer_id' => 123,
 'total' => 99.99,
 'status' => 'pending'
 ]);
 Mail::assertQueued(OrderConfirmationEmail::class, function ($mail) use ($order) {
 return $mail->hasTo($order->customer->email);
 });
 }
 public function test_inventory_tracking_is_updated()
 {
 Event::fake();
 $this->withoutDefer();
 $product = Product::factory()->create();
 $product->adjustStock(-5);
 Event::assertDispatched(InventoryAdjusted::class, function ($event) use ($product) {
 return $event->product_id === $product->id;
 });
 $this->withDefer();
 }
}

These helpers make it straightforward to test code that relies on deferred execution without waiting for the end of the request lifecycle.