fix: inheritance support in property mapper

tests/Fixtures/PropertyMapper/ChildOfSomeObject.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of rekalogika/mapper package.
+ *
+ * (c) Priyadi Iman Nurcahyo <https://rekalogika.dev>
+ *
+ * For the full copyright and license information, please view the LICENSE file
+ * that was distributed with this source code.
+ */
+
+namespace Rekalogika\Mapper\Tests\Fixtures\PropertyMapper;
+
+class ChildOfSomeObject extends SomeObject
+{
+}

tests/Fixtures/PropertyMapper/ChildOfSomeObjectDto.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of rekalogika/mapper package.
+ *
+ * (c) Priyadi Iman Nurcahyo <https://rekalogika.dev>
+ *
+ * For the full copyright and license information, please view the LICENSE file
+ * that was distributed with this source code.
+ */
+
+namespace Rekalogika\Mapper\Tests\Fixtures\PropertyMapper;
+
+class ChildOfSomeObjectDto extends SomeObjectDto
+{
+}

tests/IntegrationTest/PropertyMappingTest.php

@@ -18,6 +18,8 @@
 use Rekalogika\Mapper\MainTransformer\Implementation\MainTransformer;
 use Rekalogika\Mapper\ServiceMethod\ServiceMethodSpecification;
 use Rekalogika\Mapper\Tests\Common\FrameworkTestCase;
+use Rekalogika\Mapper\Tests\Fixtures\PropertyMapper\ChildOfSomeObject;
+use Rekalogika\Mapper\Tests\Fixtures\PropertyMapper\ChildOfSomeObjectDto;
 use Rekalogika\Mapper\Tests\Fixtures\PropertyMapper\PropertyMapperWithClassAttribute;
 use Rekalogika\Mapper\Tests\Fixtures\PropertyMapper\PropertyMapperWithClassAttributeWithoutExplicitProperty;
 use Rekalogika\Mapper\Tests\Fixtures\PropertyMapper\PropertyMapperWithConstructorWithClassAttribute;
@@ -162,6 +164,57 @@ public function testPropertyMapping(): void
         ), $dto->propertyE);
     }
 
+    public function testPropertyMappingChildToParent(): void
+    {
+        $object = new ChildOfSomeObject();
+        $dto = $this->mapper->map($object, SomeObjectDto::class);
+
+        $this->assertEquals(ChildOfSomeObject::class .  '::propertyA', $dto->propertyA);
+        $this->assertEquals(ChildOfSomeObject::class .  '::propertyB', $dto->propertyB);
+        $this->assertNull($dto->propertyC);
+        $this->assertEquals(ChildOfSomeObject::class .  '::propertyD', $dto->propertyD);
+        $this->assertEquals(sprintf(
+            'I have "%s" and "%s" that I can use to transform source property "%s"',
+            Context::class,
+            MainTransformer::class,
+            ChildOfSomeObject::class,
+        ), $dto->propertyE);
+    }
+
+    public function testPropertyMappingChildToChild(): void
+    {
+        $object = new ChildOfSomeObject();
+        $dto = $this->mapper->map($object, ChildOfSomeObjectDto::class);
+
+        $this->assertEquals(ChildOfSomeObject::class .  '::propertyA', $dto->propertyA);
+        $this->assertEquals(ChildOfSomeObject::class .  '::propertyB', $dto->propertyB);
+        $this->assertNull($dto->propertyC);
+        $this->assertEquals(ChildOfSomeObject::class .  '::propertyD', $dto->propertyD);
+        $this->assertEquals(sprintf(
+            'I have "%s" and "%s" that I can use to transform source property "%s"',
+            Context::class,
+            MainTransformer::class,
+            ChildOfSomeObject::class,
+        ), $dto->propertyE);
+    }
+
+    public function testPropertyMappingParentToChild(): void
+    {
+        $object = new SomeObject();
+        $dto = $this->mapper->map($object, ChildOfSomeObjectDto::class);
+
+        $this->assertEquals(SomeObject::class .  '::propertyA', $dto->propertyA);
+        $this->assertEquals(SomeObject::class .  '::propertyB', $dto->propertyB);
+        $this->assertNull($dto->propertyC);
+        $this->assertEquals(SomeObject::class .  '::propertyD', $dto->propertyD);
+        $this->assertEquals(sprintf(
+            'I have "%s" and "%s" that I can use to transform source property "%s"',
+            Context::class,
+            MainTransformer::class,
+            SomeObject::class,
+        ), $dto->propertyE);
+    }
+
     public function testPropertyMappingWithConstructor(): void
     {
         $object = new SomeObject();