diff --git a/tests/Fixtures/ArrayLike/LazyDoctrineCollection.php b/tests/Fixtures/ArrayLike/LazyDoctrineCollection.php
new file mode 100644
index 0000000..ad2ce54
--- /dev/null
+++ b/tests/Fixtures/ArrayLike/LazyDoctrineCollection.php
@@ -0,0 +1,27 @@
+<?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\ArrayLike;
+
+use Doctrine\Common\Collections\AbstractLazyCollection;
+
+/**
+ * @extends AbstractLazyCollection<array-key,mixed>
+ */
+class LazyDoctrineCollection extends AbstractLazyCollection
+{
+    protected function doInitialize()
+    {
+        throw new \LogicException("Not expected to be initialized");
+    }
+}
diff --git a/tests/Fixtures/ArrayLike/ObjectWithCollectionProperty.php b/tests/Fixtures/ArrayLike/ObjectWithCollectionProperty.php
new file mode 100644
index 0000000..49204a3
--- /dev/null
+++ b/tests/Fixtures/ArrayLike/ObjectWithCollectionProperty.php
@@ -0,0 +1,34 @@
+<?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\ArrayLike;
+
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
+use Rekalogika\Mapper\Tests\Fixtures\Scalar\ObjectWithScalarProperties;
+
+class ObjectWithCollectionProperty
+{
+    /**
+     * @var Collection<int,ObjectWithScalarProperties>
+     */
+    public Collection $property;
+
+    public function __construct()
+    {
+        $this->property = new ArrayCollection();
+        $this->property->add(new ObjectWithScalarProperties());
+        $this->property->add(new ObjectWithScalarProperties());
+        $this->property->add(new ObjectWithScalarProperties());
+    }
+}
diff --git a/tests/Fixtures/ArrayLike/ObjectWithLazyDoctrineCollectionProperty.php b/tests/Fixtures/ArrayLike/ObjectWithLazyDoctrineCollectionProperty.php
new file mode 100644
index 0000000..1343b15
--- /dev/null
+++ b/tests/Fixtures/ArrayLike/ObjectWithLazyDoctrineCollectionProperty.php
@@ -0,0 +1,24 @@
+<?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\ArrayLike;
+
+class ObjectWithLazyDoctrineCollectionProperty
+{
+    public LazyDoctrineCollection $property;
+
+    public function __construct()
+    {
+        $this->property = new LazyDoctrineCollection();
+    }
+}
diff --git a/tests/Fixtures/ArrayLikeDto/ObjectWithCollectionPropertyDto.php b/tests/Fixtures/ArrayLikeDto/ObjectWithCollectionPropertyDto.php
new file mode 100644
index 0000000..276fe1d
--- /dev/null
+++ b/tests/Fixtures/ArrayLikeDto/ObjectWithCollectionPropertyDto.php
@@ -0,0 +1,25 @@
+<?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\ArrayLikeDto;
+
+use Doctrine\Common\Collections\Collection;
+use Rekalogika\Mapper\Tests\Fixtures\Scalar\ObjectWithScalarPropertiesDto;
+
+class ObjectWithCollectionPropertyDto
+{
+    /**
+     * @var ?Collection<int,ObjectWithScalarPropertiesDto>
+     */
+    public ?Collection $property = null;
+}
diff --git a/tests/IntegrationTest/TraversableToArrayAccessMappingTest.php b/tests/IntegrationTest/TraversableToArrayAccessMappingTest.php
index faeedf7..65941f2 100644
--- a/tests/IntegrationTest/TraversableToArrayAccessMappingTest.php
+++ b/tests/IntegrationTest/TraversableToArrayAccessMappingTest.php
@@ -13,6 +13,8 @@
 
 namespace Rekalogika\Mapper\Tests\IntegrationTest;
 
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
 use Rekalogika\Mapper\Exception\MissingMemberValueTypeException;
 use Rekalogika\Mapper\Mapper;
 use Rekalogika\Mapper\Tests\Common\AbstractIntegrationTest;
@@ -22,6 +24,7 @@
 use Rekalogika\Mapper\Tests\Fixtures\ArrayLikeDto\ObjectWithArrayAccessPropertyDto;
 use Rekalogika\Mapper\Tests\Fixtures\ArrayLikeDto\ObjectWithArrayPropertyDto;
 use Rekalogika\Mapper\Tests\Fixtures\ArrayLikeDto\ObjectWithArrayPropertyDtoWithIntKey;
+use Rekalogika\Mapper\Tests\Fixtures\ArrayLikeDto\ObjectWithCollectionPropertyDto;
 use Rekalogika\Mapper\Tests\Fixtures\Scalar\ObjectWithScalarPropertiesDto;
 
 class TraversableToArrayAccessMappingTest extends AbstractIntegrationTest
@@ -134,6 +137,28 @@ public function testTraversableToArrayDto(): void
         $this->assertEquals(1.1, $one->d);
     }
 
+    public function testTraversableToCollectionDto(): void
+    {
+        $source = new ObjectWithTraversableProperties();
+
+        $result = $this->mapper->map($source, ObjectWithCollectionPropertyDto::class);
+
+        $this->assertInstanceOf(ObjectWithCollectionPropertyDto::class, $result);
+        $property = $result->property;
+        $this->assertInstanceOf(Collection::class, $property);
+        $this->assertInstanceOf(ArrayCollection::class, $property);
+
+        $property = $result->property;
+
+        $member = $property?->get(1);
+        $this->assertInstanceOf(ObjectWithScalarPropertiesDto::class, $member);
+
+        $this->assertEquals(1, $member->a);
+        $this->assertEquals("string", $member->b);
+        $this->assertEquals(true, $member->c);
+        $this->assertEquals(1.1, $member->d);
+    }
+
     public function testArrayToArrayAccessDto(): void
     {
         $source = new ObjectWithArrayProperty();
@@ -163,6 +188,29 @@ public function testArrayToArrayDto(): void
         $this->assertEquals(1.1, $one->d);
     }
 
+    public function testArrayToCollectionDto(): void
+    {
+        $source = new ObjectWithArrayProperty();
+
+        $result = $this->mapper->map($source, ObjectWithCollectionPropertyDto::class);
+
+        $this->assertInstanceOf(ObjectWithCollectionPropertyDto::class, $result);
+        $property = $result->property;
+        $this->assertInstanceOf(Collection::class, $property);
+        $this->assertInstanceOf(ArrayCollection::class, $property);
+
+        $property = $result->property;
+
+        $member = $property?->get(1);
+        $this->assertInstanceOf(ObjectWithScalarPropertiesDto::class, $member);
+
+        $this->assertEquals(1, $member->a);
+        $this->assertEquals("string", $member->b);
+        $this->assertEquals(true, $member->c);
+        $this->assertEquals(1.1, $member->d);
+    }
+
+
     //
     // preinitialized
     //
@@ -225,7 +273,7 @@ public function testArrayToArrayDtoPreInit(): void
     }
 
     //
-    //
+    // source has string key, target has int key
     //
 
     public function testSourceStringKeyToTargetIntKey(): void
diff --git a/tests/IntegrationTest/TraversableToTraversableMappingTest.php b/tests/IntegrationTest/TraversableToTraversableMappingTest.php
index 52ae7ae..e9d4fcb 100644
--- a/tests/IntegrationTest/TraversableToTraversableMappingTest.php
+++ b/tests/IntegrationTest/TraversableToTraversableMappingTest.php
@@ -15,6 +15,7 @@
 
 use Rekalogika\Mapper\Tests\Common\AbstractIntegrationTest;
 use Rekalogika\Mapper\Tests\Fixtures\ArrayLike\ObjectWithArrayProperty;
+use Rekalogika\Mapper\Tests\Fixtures\ArrayLike\ObjectWithLazyDoctrineCollectionProperty;
 use Rekalogika\Mapper\Tests\Fixtures\ArrayLike\ObjectWithTraversableProperties;
 use Rekalogika\Mapper\Tests\Fixtures\ArrayLikeDto\ObjectWithTraversablePropertyDto;
 use Rekalogika\Mapper\Tests\Fixtures\Scalar\ObjectWithScalarPropertiesDto;
@@ -64,4 +65,18 @@ public function testArrayToTraversableDto(): void
             $this->assertEquals(1.1, $item->d);
         }
     }
+
+    public function testLazy(): void
+    {
+        $source = new ObjectWithLazyDoctrineCollectionProperty();
+
+        $result = $this->mapper->map($source, ObjectWithTraversablePropertyDto::class);
+
+        $this->assertInstanceOf(ObjectWithTraversablePropertyDto::class, $result);
+        $this->assertNotNull($result->property);
+        $this->assertInstanceOf(\Generator::class, $result->property);
+
+        $this->expectException(\LogicException::class);
+        foreach ($result->property as $item);
+    }
 }