@dataProvider getInvalidValues
public function testInvalidValues($value) {
$constraint = new Blank(array(
'message' => 'myMessage',
));
$this->context
->expects($this
->once())
->method('addViolation')
->with('myMessage', array(
'{{ value }}' => $value,
));
$this->validator
->validate($value, $constraint);
}