public function testMessagesInsideNestedCompositeFields()
 {
     $fieldGroup = new FieldGroup(new CompositeField($textField = new TextField('TestField', 'Test Field'), $emailField = new EmailField('TestEmailField', 'Test Email Field')));
     $textField->setError('Test error message', 'warning');
     $emailField->setError('Test error message', 'error');
     $this->assertEquals('Test error message,  Test error message.', $fieldGroup->Message());
     $this->assertEquals('warning.  error', $fieldGroup->MessageType());
 }