with cast tests

tests/Casters/CasterTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Tests;
+
+use Illuminate\Validation\ValidationException;
+use Tests\Casters\SimpleValue;
+use Tests\Casters\SimpleValueCaster;
+use Tests\Casters\WithGlobalCaster;
+use Tests\Casters\WithSpecificCaster;
+use Tests\Casters\WithoutCaster;
+
+describe('caster priority', function () {
+    beforeEach(function () {
+        config(['dto.cast' => []]);
+    });
+
+    it('uses CastWith attribute over global config caster', function () {
+        $globalCaster = function (mixed $value): SimpleValue {
+            return new SimpleValue($value['value'] * 3);
+        };
+        config(['dto.cast.' . SimpleValue::class => $globalCaster]);
+
+        $object = WithSpecificCaster::fromArray([
+            'value' => ['value' => 5],
+        ]);
+
+        expect($object->value->value)->toBe(10); // 5 * 2
+    });
+
+    it('falls back to global config caster when no CastWith attribute', function () {
+        $globalCaster = function (mixed $value): SimpleValue {
+            return new SimpleValue($value['value'] * 3);
+        };
+        config(['dto.cast.' . SimpleValue::class => $globalCaster]);
+
+        $object = WithGlobalCaster::fromArray([
+            'value' => ['value' => 5],
+        ]);
+
+        expect($object->value->value)->toBe(15); // 5 * 3
+    });
+
+    it('falls back to default construction when no caster exists', function () {
+        $object = WithoutCaster::fromArray([
+            'value' => ['value' => 5],
+        ]);
+        expect($object)->toBeInstanceOf(WithoutCaster::class);
+    });
+});
+
+describe('caster with rules', function () {
+    beforeEach(function () {
+        config(['dto.cast' => []]);
+    });
+
+    it('validates input using caster rules before casting', function () {
+        expect(fn() => WithSpecificCaster::fromArray([
+            'value' => [],
+        ]))->toThrow(ValidationException::class);
+    });
+
+    it('accepts valid input and casts correctly', function () {
+        $object = WithSpecificCaster::fromArray([
+            'value' => ['value' => 10],
+        ]);
+
+        expect($object->value->value)->toBe(20); // 10 * 2
+    });
+});

tests/Casters/SimpleValue.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Casters;
+
+class SimpleValue
+{
+    public function __construct(public readonly int $value) {}
+}

tests/Casters/SimpleValueCaster.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Casters;
+
+class SimpleValueCaster
+{
+    public function cast(mixed $value): SimpleValue
+    {
+        return new SimpleValue($value['value'] * 2);
+    }
+
+    public static function rules(): array
+    {
+        return [
+            'value' => ['required', 'numeric'],
+        ];
+    }
+}

tests/Casters/WithGlobalCaster.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Casters;
+
+use Icefox\DTO\DataObject;
+
+readonly class WithGlobalCaster
+{
+    use DataObject;
+
+    public function __construct(
+        public SimpleValue $value,
+    ) {}
+}

tests/Casters/WithSpecificCaster.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Casters;
+
+use Icefox\DTO\Attributes\CastWith;
+use Icefox\DTO\DataObject;
+
+readonly class WithSpecificCaster
+{
+    use DataObject;
+
+    public function __construct(
+        #[CastWith(SimpleValueCaster::class)]
+        public SimpleValue $value,
+    ) {}
+}

tests/Casters/WithoutCaster.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Casters;
+
+use Icefox\DTO\DataObject;
+
+readonly class WithoutCaster
+{
+    use DataObject;
+
+    public function __construct(
+        public SimpleValue $value,
+    ) {}
+}