This image shouldn't always be in the images, so it's better if you make it more general, maybe you can use
// var textTest="https://t4.ftcdn.net/jpg/01/94/82/79/240_F_194827982_vFcthNvwokiEdHkyPHwpCPJCQ35tBBtw.jpg";
var imgExtentions = ['.jpg', '.png', '.jpeg'];
// var expected=res.text.includes(textTest);
var expected = imgExtentions.some(extention => res.text.includes(extention));
https://github.com/FACK1/week8---SAAO/blob/b4add2e4deb6c93eda20b56461470e466d444fba/src/tests/test.js#L26
This image shouldn't always be in the images, so it's better if you make it more general, maybe you can use