minor #18830 [Form] fixed EntityType test with query_builder option as null (HeahDude)

This PR was merged into the 2.8 branch.

Discussion
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[Form] fixed EntityType test with query_builder option as null

| Q             | A
| ------------- | ---
| Branch?       | 2.8+
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | ~
| License       | MIT
| Doc PR        | symfony/symfony-docs#6599

ref symfony/symfony#13990 (comment).

Commits
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ad8e989 [Form] fixed EntityType test with query_builder option

Author: fabpot

Tests/Form/Type/EntityTypeTest.php

@@ -222,8 +222,13 @@ public function testConfigureQueryBuilderWithClosureReturningNonQueryBuilder()
         $field->submit('2');
     }
 
-    public function testConfigureQueryBuilderWithClosureReturningNull()
+    public function testConfigureQueryBuilderWithClosureReturningNullUseDefault()
     {
+        $entity1 = new SingleIntIdEntity(1, 'Foo');
+        $entity2 = new SingleIntIdEntity(2, 'Bar');
+
+        $this->persist(array($entity1, $entity2));
+
         $field = $this->factory->createNamed('name', 'Symfony\Bridge\Doctrine\Form\Type\EntityType', null, array(
             'em' => 'default',
             'class' => self::SINGLE_IDENT_CLASS,
@@ -232,7 +237,7 @@ public function testConfigureQueryBuilderWithClosureReturningNull()
             },
         ));
 
-        $this->assertEquals(array(), $field->createView()->vars['choices']);
+        $this->assertEquals(array(1 => new ChoiceView($entity1, '1', 'Foo'), 2 => new ChoiceView($entity2, '2', 'Bar')), $field->createView()->vars['choices']);
     }
 
     public function testSetDataSingleNull()