1 files changed, 21 insertions, 0 deletions
diff --git a/layout/generic/test/file_SlowTallImage.sjs b/layout/generic/test/file_SlowTallImage.sjs
new file mode 100644
index 0000000000..382d36e49a
--- /dev/null
+++ b/layout/generic/test/file_SlowTallImage.sjs
@@ -0,0 +1,21 @@
+"use strict";
+
+let { setTimeout } = ChromeUtils.importESModule(
+  "resource://gre/modules/Timer.sys.mjs"
+);
+
+// A tall 1x1000 black png.
+const IMG_BYTES = atob(
+  "iVBORw0KGgoAAAANSUhEUgAAAAEAAAPoAQMAAAAleAYdAAAABlBMVEUAAAD///+l2Z/dAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAF0lEQVQ4jWNgGAWjYBSMglEwCkbBUAcAB9AAASBs/t4AAAAASUVORK5CYII="
+);
+
+// Cargo-culted from file_SlowImage.sjs
+function handleRequest(request, response) {
+  response.processAsync();
+  response.setHeader("Content-Type", "image/png");
+  let delay = request.queryString.indexOf("slow") >= 0 ? 600 : 200;
+  setTimeout(function () {
+    response.write(IMG_BYTES);
+    response.finish();
+  }, delay);
+}