Adding scrape files for testing

server/tests/fixtures/html/srcset.html

@@ -0,0 +1,7 @@
+<!doctype html>
+<html>
+<head><title>Srcset</title></head>
+<body>
+  <img srcset="https://cdn.example.com/small.jpg 320w, https://cdn.example.com/large.jpg 1600w, https://cdn.example.com/medium.jpg 800w">
+</body>
+</html>