Screenshots in PhantomJS tests

Open file odoo/tests/phantomtest.js and after the line

console.log("PhantomTest.run: execution launched, waiting for console.log('ok')...");

add following

i=1;
setInterval(function(){
    self.page.render('/tmp/phantomjs-'+i+'.png');
    i++;
}, 1000);

It will create screenshot every 1 second (you can update it if needed)