[Form] Fixed issues mentioned in the PR comments

UPGRADE-2.1.md

@@ -237,14 +237,14 @@ UPGRADE FROM 2.0 to 2.1
 
     Before:
 
-        public function getParent()
+        public function getParent(array $options)
         {
             return 'single_text' === $options['widget'] ? 'text' : 'choice';
         }
 
     After:
 
-        public function getParent()
+        public function getParent(array $options)
         {
             return isset($options['widget']) && 'single_text' === $options['widget'] ? 'text' : 'choice';
         }

src/Symfony/Component/Form/Extension/Core/DataTransformer/ChoicesToBooleanArrayTransformer.php

@@ -107,7 +107,7 @@ class ChoicesToBooleanArrayTransformer implements DataTransformerInterface
         }
 
         if (count($unknown) > 0) {
-            throw new TransformationFailedException('The choices "' . implode('", "', $unknown) . '" where not found');
+            throw new TransformationFailedException('The choices "' . implode('", "', $unknown) . '" were not found');
         }
 
         return $result;

tests/Symfony/Tests/Component/Form/Extension/Core/Type/DateTimeTypeTest.php

@@ -264,6 +264,6 @@ class DateTimeTypeTest extends LocalizedTestCase
     {
         // Throws an exception if "data_class" option is not explicitely set
         // to null in the type
-        $form = $this->factory->create('datetime', new \DateTime());
+        $this->factory->create('datetime', new \DateTime());
     }
 }

tests/Symfony/Tests/Component/Form/Extension/Core/Type/DateTypeTest.php

@@ -536,6 +536,6 @@ class DateTypeTest extends LocalizedTestCase
     {
         // Throws an exception if "data_class" option is not explicitely set
         // to null in the type
-        $form = $this->factory->create('date', new \DateTime());
+        $this->factory->create('date', new \DateTime());
     }
 }

tests/Symfony/Tests/Component/Form/Extension/Core/Type/TimeTypeTest.php

@@ -407,6 +407,6 @@ class TimeTypeTest extends LocalizedTestCase
     {
         // Throws an exception if "data_class" option is not explicitely set
         // to null in the type
-        $form = $this->factory->create('time', new \DateTime());
+        $this->factory->create('time', new \DateTime());
     }
 }