Adding scrape files for testing

server/tests/fixtures/html/tracking-pixels.html

@@ -0,0 +1,9 @@
+<!doctype html>
+<html>
+<head><title>Pixels</title></head>
+<body>
+  <img src="https://analytics.example.net/1x1.gif" width="1" height="1">
+  <img src="https://cdn.example.com/spacer.gif">
+  <img src="https://cdn.example.com/real-photo.jpg" width="800" height="600">
+</body>
+</html>