Use scheduled entity insertions to avoid tag duplicate

Using `getScheduledEntityInsertions()` we can retrieve not yet flushed but already persisted entities and then avoid tags duplication on import.

tests/Wallabag/CoreBundle/Helper/ContentProxyTest.php

@@ -296,6 +296,29 @@ class ContentProxyTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals('tag2', $entry->getTags()[1]->getLabel());
     }
 
+    public function testAssignTagsNotFlushed()
+    {
+        $graby = $this->getMockBuilder('Graby\Graby')
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        $tagRepo = $this->getTagRepositoryMock();
+        $tagRepo->expects($this->never())
+            ->method('__call');
+
+        $proxy = new ContentProxy($graby, $this->getTaggerMock(), $tagRepo, $this->getLogger());
+
+        $tagEntity = new Tag();
+        $tagEntity->setLabel('tag1');
+
+        $entry = new Entry(new User());
+
+        $proxy->assignTagsToEntry($entry, 'tag1', [$tagEntity]);
+
+        $this->assertCount(1, $entry->getTags());
+        $this->assertEquals('tag1', $entry->getTags()[0]->getLabel());
+    }
+
     private function getTaggerMock()
     {
         return $this->getMockBuilder('Wallabag\CoreBundle\Helper\RuleBasedTagger')

tests/Wallabag/ImportBundle/Import/PocketImportTest.php

@@ -41,6 +41,20 @@ class PocketImportTest extends \PHPUnit_Framework_TestCase
             ->disableOriginalConstructor()
             ->getMock();
 
+        $this->uow = $this->getMockBuilder('Doctrine\ORM\UnitOfWork')
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        $this->em
+            ->expects($this->any())
+            ->method('getUnitOfWork')
+            ->willReturn($this->uow);
+
+        $this->uow
+            ->expects($this->any())
+            ->method('getScheduledEntityInsertions')
+            ->willReturn([]);
+
         $pocket = new PocketImport(
             $this->em,
             $this->contentProxy

tests/Wallabag/ImportBundle/Import/WallabagV1ImportTest.php

@@ -26,6 +26,20 @@ class WallabagV1ImportTest extends \PHPUnit_Framework_TestCase
             ->disableOriginalConstructor()
             ->getMock();
 
+        $this->uow = $this->getMockBuilder('Doctrine\ORM\UnitOfWork')
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        $this->em
+            ->expects($this->any())
+            ->method('getUnitOfWork')
+            ->willReturn($this->uow);
+
+        $this->uow
+            ->expects($this->any())
+            ->method('getScheduledEntityInsertions')
+            ->willReturn([]);
+
         $this->contentProxy = $this->getMockBuilder('Wallabag\CoreBundle\Helper\ContentProxy')
             ->disableOriginalConstructor()
             ->getMock();

tests/Wallabag/ImportBundle/Import/WallabagV2ImportTest.php

@@ -26,6 +26,20 @@ class WallabagV2ImportTest extends \PHPUnit_Framework_TestCase
             ->disableOriginalConstructor()
             ->getMock();
 
+        $this->uow = $this->getMockBuilder('Doctrine\ORM\UnitOfWork')
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        $this->em
+            ->expects($this->any())
+            ->method('getUnitOfWork')
+            ->willReturn($this->uow);
+
+        $this->uow
+            ->expects($this->any())
+            ->method('getScheduledEntityInsertions')
+            ->willReturn([]);
+
         $this->contentProxy = $this->getMockBuilder('Wallabag\CoreBundle\Helper\ContentProxy')
             ->disableOriginalConstructor()
             ->getMock();