Merge branch '2.8' into 3.3

* 2.8:
  Refactoring tests.

Author: nicolas-grekas

Tests/CrawlerTest.php

@@ -204,7 +204,7 @@ public function testAddXmlContentWithErrors()
 EOF
         , 'UTF-8');
 
-        $this->assertTrue(count(libxml_get_errors()) > 1);
+        $this->assertGreaterThan(1, libxml_get_errors());
 
         libxml_clear_errors();
         libxml_use_internal_errors($internalErrors);

Tests/FormTest.php

@@ -376,15 +376,15 @@ public function testOffsetUnset()
     {
         $form = $this->createForm('<form><input type="text" name="foo" value="foo" /><input type="submit" /></form>');
         unset($form['foo']);
-        $this->assertFalse(isset($form['foo']), '->offsetUnset() removes a field');
+        $this->assertArrayNotHasKey('foo', $form, '->offsetUnset() removes a field');
     }
 
     public function testOffsetExists()
     {
         $form = $this->createForm('<form><input type="text" name="foo" value="foo" /><input type="submit" /></form>');
 
-        $this->assertTrue(isset($form['foo']), '->offsetExists() return true if the field exists');
-        $this->assertFalse(isset($form['bar']), '->offsetExists() return false if the field does not exist');
+        $this->assertArrayHasKey('foo', $form, '->offsetExists() return true if the field exists');
+        $this->assertArrayNotHasKey('bar', $form, '->offsetExists() return false if the field does not exist');
     }
 
     public function testGetValues()