Given a source directory (@see \Mutagenesis\Generator::setSourceDirectory)
pass each to a \Mutagenesis\Mutable instance which is used to generate
mutations and store the instructions for applying and reversing them as
a set of mutables (instances of \Mutagenesis\Mutation).
public function testShouldGenerateAMutableFileObjectPerDetectedFile()
{
$generator = new Generator();
$generator->setSourceDirectory($this->root);
$mutable = $this->getMock('\\Mutagenesis\\Mutable', array('generate', 'setFilename'));
$generator->generate($mutable);
$this->assertEquals(2, count($generator->getMutables()));
}
