Add tests for image.onerror (#11683)

* Add tests for image.onerror * Fixed nit issue * Add test for 404 response with actual image data and revert nonexistent-image.html
web-platform-tests · Dec 24, 2018 · a357943 · a357943
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diff --git a/html/semantics/embedded-content/the-img-element/404-response-with-actual-image-data.html b/html/semantics/embedded-content/the-img-element/404-response-with-actual-image-data.html
@@ -0,0 +1,18 @@
+<!DOCTYPE HTML>
+<meta charset="utf-8">
+<title>404 response with actual image data should be rendered and load event is fired</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<img id="img">
+
+<script>
+  async_test(t => {
+    var img = document.getElementById("img");
+    img.onload = t.step_func_done(e => {
+      assert_equals(e.type, "load", "image.onload() called");
+    });
+    img.onerror = t.unreached_func("image.onerror() was not supposed to be called");
+    img.src = "404-response-with-actual-image-data.py";
+  }, "404 response with actual image data should be rendered and load event is fired");
+</script>
diff --git a/html/semantics/embedded-content/the-img-element/404-response-with-actual-image-data.py b/html/semantics/embedded-content/the-img-element/404-response-with-actual-image-data.py
@@ -0,0 +1,3 @@
+import base64
+def main(req, res):
+    return 404, [('Content-Type', 'image/png')], base64.decodestring("iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAAhSURBVDhPY3wro/KfgQLABKXJBqMGjBoAAqMGDLwBDAwAEsoCTFWunmQAAAAASUVORK5CYII=")