public function testGeneration()
{
$length = 3;
$expr = '\\d{' . $length . '}';
$map = array(array('regexgenerator', new RegRevGenerator()), array('expression', $expr));
$this->mockCaller->expects($this->exactly(2))->method('getOption')->will($this->returnValueMap($map));
$fakeData = $this->regExGenerator->generate();
$this->assertEquals($length, strlen($fakeData));
}