diff --git a/src/Activities/ActivityEvent.php b/src/Activities/ActivityEvent.php
index 4f6f519..3f0300e 100644
--- a/src/Activities/ActivityEvent.php
+++ b/src/Activities/ActivityEvent.php
@@ -28,7 +28,7 @@ class ActivityEvent extends Event
      */
     protected $request;
 
-    protected function __construct( array $activity, ActivityPubObject $actor,
+    public function __construct( array $activity, ActivityPubObject $actor,
                                     Request $request )
     {
         $this->activity = $activity;
diff --git a/src/Controllers/PostController.php b/src/Controllers/PostController.php
index 263c200..ab77e06 100644
--- a/src/Controllers/PostController.php
+++ b/src/Controllers/PostController.php
@@ -43,12 +43,13 @@ class PostController
     public function handle( Request $request )
     {
         $uri = $this->getUriWithoutQuery( $request );
-        $object = $this->objectsService->dereference( $uri );
+        $object = $this->objectsService->query( array( 'id' => $uri ) );
         if ( ! $object ) {
             throw new NotFoundHttpException;
         }
-        $actorWithInbox = $this->objectWithField( 'inbox', $uri );
-        if ( $actorWithInbox ) {
+        $inboxField = $object->getReferencingField( 'inbox' );
+        if ( $inboxField ) {
+            $actorWithInbox = $inboxField->getObject();
             if ( ! $request->attributes->has( 'signed' ) ||
                  ! $this->authorized( $request, $actorWithInbox ) ) {
                 throw new UnauthorizedHttpException();
@@ -61,8 +62,9 @@ class PostController
             $this->eventDispatcher->dispatch( InboxActivityEvent::NAME, $event );
             return;
         }
-        $actorWithOutbox = $this->objectWithField( 'outbox', $uri );
-        if ( $actorWithOutbox ) {
+        $outboxField = $object->getReferencingField( 'outbox' );
+        if ( $outboxField ) {
+            $actorWithOutbox = $outboxField->getObject();
             if ( ! $this->authorized( $request, $actorWithOutbox ) ) {
                 throw new UnauthorizedHttpException();
             }
diff --git a/src/Entities/ActivityPubObject.php b/src/Entities/ActivityPubObject.php
index 465586d..c46d44c 100644
--- a/src/Entities/ActivityPubObject.php
+++ b/src/Entities/ActivityPubObject.php
@@ -201,6 +201,36 @@ class ActivityPubObject implements ArrayAccess
         $this->lastUpdated = $time;
     }
 
+    /**
+     * Returns true if the object is referenced by a field with key $name
+     *
+     * @return boolean
+     */
+    public function hasReferencingField( string $name )
+    {
+        foreach( $this->getReferencingFields() as $field ) {
+            if ( $field->getName() === $name ) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Returns the referencing field named $field, if it exists
+     *
+     * @param string $name The name of the referencing to get
+     * @return Field|null
+     */
+    public function getReferencingField( string $name )
+    {
+        foreach( $this->getReferencingFields() as $field ) {
+            if ( $field->getName() === $name ) {
+                return $field;
+            }
+        }
+    }
+
     /**
      * Adds a new field that references this object
      *
diff --git a/src/Entities/Field.php b/src/Entities/Field.php
index d1b4cfb..e39bc27 100644
--- a/src/Entities/Field.php
+++ b/src/Entities/Field.php
@@ -67,6 +67,15 @@ class Field
      */
     protected $lastUpdated;
 
+    protected function __construct( DateTime $time = null )
+    {
+        if ( ! $time ) {
+            $time = new DateTime( "now" );
+        }
+        $this->created = $time;
+        $this->lastUpdated = $time;
+    }
+
     /**
      * Create a new field with a string value
      *
@@ -80,12 +89,10 @@ class Field
         if ( ! $time ) {
             $time = new DateTime( "now" );
         }
-        $field = new Field();
+        $field = new Field( $time );
         $field->setObject( $object, $time );
         $field->setName( $name );
-        $field->setValue( $value );
-        $field->setCreated( $time );
-        $field->setLastUpdated( $time );
+        $field->setValue( $value, $time );
         return $field;
     }
 
@@ -97,17 +104,18 @@ class Field
      * @param ActivityPubObject $targetObject The object that this field holds
      * @return Field The new field
      */
-    public static function withObject( ActivityPubObject $object, string $name, Object $targetObject, DateTime $time = null )
+    public static function withObject( ActivityPubObject $object,
+                                       string $name,
+                                       ActivityPubObject $targetObject,
+                                       DateTime $time = null )
     {
         if ( ! $time ) {
             $time = new DateTime( "now" );
         }
-        $field = new Field();
+        $field = new Field( $time );
         $field->setObject( $object, $time );
         $field->setName( $name );
-        $field->setTargetObject( $targetObject );
-        $field->setCreated( $time );
-        $field->setLastUpdated( $time );
+        $field->setTargetObject( $targetObject, $time );
         return $field;
     }
 
diff --git a/test/Auth/AuthListenerTest.php b/test/Auth/AuthListenerTest.php
index 38086eb..3045d72 100644
--- a/test/Auth/AuthListenerTest.php
+++ b/test/Auth/AuthListenerTest.php
@@ -4,7 +4,7 @@ namespace ActivityPub\Test\Auth;
 use ActivityPub\Auth\AuthListener;
 use ActivityPub\Objects\ObjectsService;
 use ActivityPub\Entities\ActivityPubObject;
-use ActivityPub\Test\TestUtils\TestUtils;
+use ActivityPub\Test\TestUtils\TestActivityPubObject;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
@@ -18,10 +18,10 @@ class AuthListenerTest extends TestCase
     {
         $this->objectsService = $this->createMock( ObjectsService::class );
         $this->objectsService->method( 'dereference' )->will( $this->returnValueMap( array(
-            array( 'https://example.com/actor/1', TestUtils::objectFromArray( array(
+            array( 'https://example.com/actor/1', TestActivityPubObject::fromArray( array(
                 'id' => 'https://example.com/actor/1',
             ) ) ),
-            array( 'https://example.com/actor/2', TestUtils::objectFromArray( array(
+            array( 'https://example.com/actor/2', TestActivityPubObject::fromArray( array(
                 'id' => 'https://example.com/actor/2',
             ) ) ),
         ) ) );
@@ -45,7 +45,7 @@ class AuthListenerTest extends TestCase
                     return 'https://example.com/actor/1';
                 },
                 'expectedAttributes' => array(
-                    'actor' => TestUtils::objectFromArray( array(
+                    'actor' => TestActivityPubObject::fromArray( array(
                         'id' => 'https://example.com/actor/1',
                     ) ),
                 ),
@@ -56,12 +56,12 @@ class AuthListenerTest extends TestCase
                     return 'https://example.com/actor/1';
                 },
                 'requestAttributes' => array(
-                    'actor' => TestUtils::objectFromArray( array(
+                    'actor' => TestActivityPubObject::fromArray( array(
                         'id' => 'https://example.com/actor/2',
                     ) ),
                 ),
                 'expectedAttributes' => array(
-                    'actor' => TestUtils::objectFromArray( array(
+                    'actor' => TestActivityPubObject::fromArray( array(
                         'id' => 'https://example.com/actor/2',
                     ) ),
                 ),
diff --git a/test/Auth/AuthServiceTest.php b/test/Auth/AuthServiceTest.php
index 686ffd6..7c1ce10 100644
--- a/test/Auth/AuthServiceTest.php
+++ b/test/Auth/AuthServiceTest.php
@@ -2,7 +2,7 @@
 namespace ActivityPub\Test\Auth;
 
 use ActivityPub\Auth\AuthService;
-use ActivityPub\Test\TestUtils\TestUtils;
+use ActivityPub\Test\TestUtils\TestActivityPubObject;
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\HttpFoundation\Request;
 
@@ -64,7 +64,7 @@ class AuthServiceTest extends TestCase
             if ( array_key_exists( 'actor', $testCase ) ) {
                 $request->attributes->set( 'actor', $testCase['actor'] );
             }
-            $object = TestUtils::objectFromArray( $testCase['object'] );
+            $object = TestActivityPubObject::fromArray( $testCase['object'] );
             $actual = $this->authService->isAuthorized( $request, $object );
             $this->assertEquals(
                 $testCase['expectedResult'], $actual, "Error on test $testCase[id]"
diff --git a/test/Auth/SignatureListenerTest.php b/test/Auth/SignatureListenerTest.php
index 81a7454..b3e48f8 100644
--- a/test/Auth/SignatureListenerTest.php
+++ b/test/Auth/SignatureListenerTest.php
@@ -7,8 +7,8 @@ use ActivityPub\Crypto\HttpSignatureService;
 use ActivityPub\Entities\ActivityPubObject;
 use ActivityPub\Entities\Field;
 use ActivityPub\Objects\ObjectsService;
+use ActivityPub\Test\TestUtils\TestActivityPubObject;
 use ActivityPub\Test\TestUtils\TestDateTimeProvider;
-use ActivityPub\Test\TestUtils\TestUtils;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
@@ -44,8 +44,8 @@ oYi+1hqp1fIekaxsyQIDAQAB
         $objectsService = $this->createMock( ObjectsService::class );
         $objectsService->method( 'dereference' )
             ->will( $this->returnValueMap( array(
-                array( self::KEY_ID, TestUtils::objectFromArray( self::KEY ) ),
-                array( self::ACTOR_ID, TestUtils::objectFromArray( self::ACTOR ) ),
+                array( self::KEY_ID, TestActivityPubObject::fromArray( self::KEY ) ),
+                array( self::ACTOR_ID, TestActivityPubObject::fromArray( self::ACTOR ) ),
             ) ) );
         $this->signatureListener = new SignatureListener(
             $httpSignatureService, $objectsService
@@ -85,7 +85,7 @@ oYi+1hqp1fIekaxsyQIDAQAB
                 ),
                 'expectedAttributes' => array(
                     'signed' => true,
-                    'actor' => TestUtils::objectFromArray( array(
+                    'actor' => TestActivityPubObject::fromArray( array(
                         'id' => 'https://example.com/actor/1',
                     ) ),
                 ),
@@ -96,13 +96,13 @@ oYi+1hqp1fIekaxsyQIDAQAB
                     'Authorization' => 'Signature keyId="https://example.com/actor/1/key",algorithm="rsa-sha256",headers="(request-target) host date", signature="qdx+H7PHHDZgy4y/Ahn9Tny9V3GP6YgBPyUXMmoxWtLbHpUnXS2mg2+SbrQDMCJypxBLSPQR2aAjn7ndmw2iicw3HMbe8VfEdKFYRqzic+efkb3nndiv/x1xSHDJWeSWkx3ButlYSuBskLu6kd9Fswtemr3lgdDEmn04swr2Os0="',
                 ),
                 'requestAttributes' => array(
-                    'actor' => TestUtils::objectFromArray( array(
+                    'actor' => TestActivityPubObject::fromArray( array(
                         'id' => 'https://example.com/actor/2',
                     ) ),
                 ),
                 'expectedAttributes' => array(
                     'signed' => true,
-                    'actor' => TestUtils::objectFromArray( array(
+                    'actor' => TestActivityPubObject::fromArray( array(
                         'id' => 'https://example.com/actor/2',
                     ) ),
                 ),
@@ -114,7 +114,7 @@ oYi+1hqp1fIekaxsyQIDAQAB
                 ),
                 'expectedAttributes' => array(
                     'signed' => true,
-                    'actor' => TestUtils::objectFromArray( array(
+                    'actor' => TestActivityPubObject::fromArray( array(
                         'id' => 'https://example.com/actor/1',
                     ) ),
                 ),
@@ -137,27 +137,11 @@ oYi+1hqp1fIekaxsyQIDAQAB
                 }
             }
             $this->signatureListener->validateHttpSignature( $event );
-            foreach ( $testCase['expectedAttributes'] as $expectedKey => $expectedValue ) {
-                $this->assertTrue(
-                    $event->getRequest()->attributes->has( $expectedKey ),
-                    "Error on test $testCase[id]"
-                );
-                xdebug_break();
-                if ( $expectedValue instanceof ActivityPubObject ) {
-                    $this->assertTrue(
-                        $expectedValue->equals(
-                            $event->getRequest()->attributes->get( $expectedKey )
-                        ),
-                        "Error on test $testCase[id]"
-                    );
-                } else {
-                    $this->assertEquals(
-                        $expectedValue,
-                        $event->getRequest()->attributes->get( $expectedKey ),
-                        "Error on test $testCase[id]"
-                    );
-                }
-            }
+            $this->assertEquals(
+                $testCase['expectedAttributes'],
+                $event->getRequest()->attributes->all(),
+                "Error on test $testCase[id]"
+            );
         }
     }
 }
diff --git a/test/Controllers/GetControllerTest.php b/test/Controllers/GetControllerTest.php
index f9bad68..dda226d 100644
--- a/test/Controllers/GetControllerTest.php
+++ b/test/Controllers/GetControllerTest.php
@@ -8,7 +8,7 @@ use ActivityPub\Entities\Field;
 use ActivityPub\Objects\ContextProvider;
 use ActivityPub\Objects\CollectionsService;
 use ActivityPub\Objects\ObjectsService;
-use ActivityPub\Test\TestUtils\TestUtils;
+use ActivityPub\Test\TestUtils\TestActivityPubObject;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\Exception\UnauthorizedHttpException;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
@@ -59,7 +59,7 @@ class GetControllerTest extends TestCase
         $objectsService->method( 'dereference' )->will(
             $this->returnCallback( function( $uri ) {
                 if ( array_key_exists( $uri, self::OBJECTS ) ) {
-                    return TestUtils::objectFromArray( self::OBJECTS[$uri] );
+                    return TestActivityPubObject::fromArray( self::OBJECTS[$uri] );
                 }
             })
         );
diff --git a/test/Controllers/PostControllerTest.php b/test/Controllers/PostControllerTest.php
index a79c367..031b76d 100644
--- a/test/Controllers/PostControllerTest.php
+++ b/test/Controllers/PostControllerTest.php
@@ -1,14 +1,96 @@
 <?php
 namespace ActivityPub\Test\Controllers;
 
+use ActivityPub\Activities\InboxActivityEvent;
+use ActivityPub\Activities\OutboxActivityEvent;
+use ActivityPub\Controllers\PostController;
+use ActivityPub\Objects\ObjectsService;
+use ActivityPub\Test\TestUtils\TestActivityPubObject;
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\HttpFoundation\Request;
 
 class PostControllerTest extends TestCase
 {
-    public function testOutboxController()
+    const OBJECTS = array(
+        'https://example.com/actor/1/inbox' => array(
+            'id' => 'https://example.com/actor/1/inbox',
+        ),
+    );
+
+    public function testPostController()
     {
-        // TODO implement me
-        $this->assertTrue( false );
+        $objectsService = $this->createMock( ObjectsService::class );
+        $objectsService->method( 'query' )->will(
+            $this->returnCallback( function( $query ) {
+                if ( array_key_exists( 'id', $query ) &&
+                     array_key_exists( $query['id'], self::OBJECTS ) ) {
+                    return array( TestActivityPubObject::fromArray(
+                        self::OBJECTS[$query['id']]
+                    ) );
+                } else {
+                    return array();
+                }
+            } )
+        );
+        $testCases = array(
+            array(
+                'id' => 'basicInboxTest',
+                'request' => Request::create(
+                    'https://example.com/actor/1/inbox',
+                    Request::METHOD_POST,
+                    array(), array(), array(), array(),
+                    '{"type": "Create"}'
+                ),
+                'requestAttributes' => array(
+                    'signed' => true,
+                    'actor' => TestActivityPubObject::fromArray( array(
+                        'id' => 'https://example.com/actor/1',
+                        'inbox' => array(
+                            'id' => 'https://example.com/actor/1/inbox',
+                        )
+                    ) ),
+                ),
+                'expectedEventName' => InboxActivityEvent::NAME,
+                'expectedEvent' => new InboxActivityEvent(
+                    array( 'type' => 'Create' ),
+                    TestActivityPubObject::fromArray( array(
+                        'id' => 'https://example.com/actor/1',
+                        'inbox' => array(
+                            'id' => 'https://example.com/actor/1/inbox',
+                        )
+                    ) ),
+                    Request::create(
+                        'https://example.com/actor/1/inbox',
+                        Request::METHOD_POST,
+                        array(), array(), array(), array(),
+                        '{"type": "Create"}'
+                    )
+                ),
+            ),
+        );
+        foreach ( $testCases as $testCase ) {
+            $eventDispatcher = $this->getMockBuilder( EventDispatcher::class )
+                             ->setMethods( array( 'dispatch' ) )
+                             ->getMock();
+            if ( array_key_exists( 'expectedEvent', $testCase ) ) {
+                $eventDispatcher->expects( $this->once() )
+                    ->method( 'dispatch' )
+                    ->with(
+                        $this->equalTo($testCase['expectedEventName']),
+                        $this->equalTo($testCase['expectedEvent'])
+                    );
+            }
+            $postController = new PostController( $eventDispatcher, $objectsService );
+            $request = $testCase['request'];
+            if ( array_key_exists( 'requestAttributes', $testCase ) ) {
+                $request->attributes->add( $testCase['requestAttributes'] );
+            }
+            if ( array_key_exists( 'expectedException', $testCase ) ) {
+                $this->expectException( $testCase['expectedException'] );
+            }
+            $postController->handle( $request );
+        }
     }
 }
 ?>
diff --git a/test/Objects/CollectionsServiceTest.php b/test/Objects/CollectionsServiceTest.php
index d7b3e5e..c66e899 100644
--- a/test/Objects/CollectionsServiceTest.php
+++ b/test/Objects/CollectionsServiceTest.php
@@ -5,7 +5,7 @@ use Exception;
 use ActivityPub\Auth\AuthService;
 use ActivityPub\Objects\ContextProvider;
 use ActivityPub\Objects\CollectionsService;
-use ActivityPub\Test\TestUtils\TestUtils;
+use ActivityPub\Test\TestUtils\TestActivityPubObject;
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
@@ -370,7 +370,8 @@ class CollectionsServiceTest extends TestCase
                 $request->attributes->add( $testCase['requestAttributes'] );
             }
             $actual = $this->collectionsService->pageAndFilterCollection(
-                $testCase['request'], TestUtils::objectFromArray( $testCase['collection'] )
+                $testCase['request'],
+                TestActivityPubObject::fromArray( $testCase['collection'] )
             );
             $this->assertEquals(
                 $testCase['expectedResult'], $actual, "Error on test $testCase[id]"
diff --git a/test/TestUtils/TestActivityPubObject.php b/test/TestUtils/TestActivityPubObject.php
new file mode 100644
index 0000000..f8f9a73
--- /dev/null
+++ b/test/TestUtils/TestActivityPubObject.php
@@ -0,0 +1,65 @@
+<?php
+namespace ActivityPub\Test\TestUtils;
+
+use ActivityPub\Entities\ActivityPubObject;
+use ActivityPub\Entities\Field;
+use ActivityPub\Test\TestUtils\TestField;
+use DateTime;
+
+/**
+ * Like an ActivityPubObject, but with fixed timestamps for testing
+ */
+class TestActivityPubObject extends ActivityPubObject
+{
+    public static function getDefaultTime() {
+        return DateTime::createFromFormat(
+            DateTime::RFC2822, 'Sun, 05 Jan 2014 21:31:40 GMT'
+        );
+    }
+
+    private $fixedTime;
+
+    public function __construct( DateTime $time = null )
+    {
+        if ( ! $time ) {
+            $time = self::getDefaultTime();
+        }
+        $this->fixedTime = $time;
+        parent::__construct( $time );
+    }
+
+    public function addField( Field $field, DateTime $time = null )
+    {
+        parent::addField( $field, $time );
+        $this->lastUpdated = $this->fixedTime;
+    }
+
+    public function removeField( Field $field, DateTime $time = null )
+    {
+        parent::removeField( $field, $time );
+        $this->lastUpdated = $this->fixedTime;
+    }
+
+    public function setLastUpdated( $lastUpdated )
+    {
+        // do not change lastUpdated
+    }
+
+    public static function fromArray( array $arr, DateTime $time = null )
+    {
+        if ( ! $time ) {
+            $time = self::getDefaultTime();
+        }
+        $object = new TestActivityPubObject( $time );
+        foreach ( $arr as $name => $value ) {
+            if ( is_array( $value ) ) {
+                $child = self::fromArray( $value, $time );
+                TestField::withObject( $object, $name, $child, $time );
+            } else {
+                TestField::withValue( $object, $name, $value, $time );
+            }
+        }
+        return $object;
+    }
+}
+?>
diff --git a/test/TestUtils/TestField.php b/test/TestUtils/TestField.php
new file mode 100644
index 0000000..2ee1968
--- /dev/null
+++ b/test/TestUtils/TestField.php
@@ -0,0 +1,46 @@
+<?php
+namespace ActivityPub\Test\TestUtils;
+
+use ActivityPub\Entities\Field;
+use ActivityPub\Test\TestUtils\TestActivityPubObject;
+
+/**
+ * Like a Field, but with fixed timestamps for testing
+ */
+class TestField extends Field
+{
+    private $fixedTime;
+
+    protected function __construct( $time = null )
+    {
+        if ( ! $time ) {
+            $time = TestActivityPubObject::getDefaultTime();
+        }
+        parent::__construct( $time );
+        $this->fixedTime = $time;
+    }
+
+    public function setTargetObject( $targetObject, $time = null )
+    {
+        parent::setTargetObject( $targetObject, $time );
+        $this->lastUpdated = $this->fixedTime;
+    }
+
+    public function setValue( $value, $time = null )
+    {
+        parent::setValue( $value, $time );
+        $this->lastUpdated = $this->fixedTime;
+    }
+
+    protected function setCreated( $timestamp )
+    {
+        // don't set created
+    }
+
+    protected function setLastupdated( $timestamp )
+    {
+        // don't set lastUpdated
+    }
+
+}
+?>
diff --git a/test/TestUtils/TestUtils.php b/test/TestUtils/TestUtils.php
deleted file mode 100644
index 74a743e..0000000
--- a/test/TestUtils/TestUtils.php
+++ /dev/null
@@ -1,22 +0,0 @@
-<?php
-namespace ActivityPub\Test\TestUtils;
-
-use ActivityPub\Entities\ActivityPubObject;
-use ActivityPub\Entities\Field;
-
-class TestUtils
-{
-    public static function objectFromArray( $array ) {
-        $object = new ActivityPubObject();
-        foreach ( $array as $name => $value ) {
-            if ( is_array( $value ) ) {
-                $child = self::objectFromArray( $value );
-                Field::withObject( $object, $name, $child );
-            } else {
-                Field::withValue( $object, $name, $value );
-            }
-        }
-        return $object;
-    }
-}
-?>