feat: add cart:debug command

tests/Unit/Commands/DebugCommandTest.php

@@ -0,0 +1,71 @@
+<?php
+
+use Wearepixel\Cart\Cart;
+use Wearepixel\Cart\Commands\DebugCommand;
+use Wearepixel\Cart\Drivers\NullDriver;
+
+function makeDebugCart(): Cart
+{
+    $events = Mockery::mock('Illuminate\Contracts\Events\Dispatcher');
+    $events->shouldReceive('dispatch');
+
+    return new Cart(
+        new NullDriver('debug-session'),
+        $events,
+        'cart',
+        require __DIR__ . '/../../Helpers/ConfigMock.php',
+    );
+}
+
+afterEach(fn() => Mockery::close());
+
+describe('DebugCommand::debugData()', function () {
+    test('returns driver name', function () {
+        $cart = makeDebugCart();
+        $data = DebugCommand::debugData($cart);
+        expect($data['driver'])->toBe('null');
+    });
+
+    test('returns item count', function () {
+        $cart = makeDebugCart();
+        $cart->add(1, 'Widget', 10.00, 1);
+        $data = DebugCommand::debugData($cart);
+        expect($data['item_count'])->toBe(1);
+    });
+
+    test('returns total quantity', function () {
+        $cart = makeDebugCart();
+        $cart->add(1, 'Widget', 10.00, 3);
+        $data = DebugCommand::debugData($cart);
+        expect($data['total_quantity'])->toBe(3);
+    });
+
+    test('returns subtotal', function () {
+        $cart = makeDebugCart();
+        $cart->add(1, 'Widget', 25.00, 2);
+        $data = DebugCommand::debugData($cart);
+        expect($data['subtotal'])->toBe(50.00);
+    });
+
+    test('returns total', function () {
+        $cart = makeDebugCart();
+        $cart->add(1, 'Widget', 25.00, 2);
+        $data = DebugCommand::debugData($cart);
+        expect($data['total'])->toBe(50.00);
+    });
+
+    test('returns empty items array when cart is empty', function () {
+        $cart = makeDebugCart();
+        $data = DebugCommand::debugData($cart);
+        expect($data['items'])->toBeArray()->toBeEmpty();
+    });
+
+    test('returns condition names', function () {
+        $cart = makeDebugCart();
+        $cart->condition(new \Wearepixel\Cart\CartCondition([
+            'name' => 'GST', 'type' => 'tax', 'value' => '10%', 'target' => 'subtotal',
+        ]));
+        $data = DebugCommand::debugData($cart);
+        expect($data['conditions'])->toContain('GST');
+    });
+});