import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

testing/web-platform/tests/eventsource/dedicated-worker/eventsource-onmesage.htm

@@ -0,0 +1,36 @@
+<!--
+try {
+  var source = new EventSource("../resources/message.py")
+  source.onmessage = function(e) {
+    postMessage([true, e.data])
+    this.close()
+  }
+} catch(e) {
+  postMessage([false, String(e)])
+}
+/*-->
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>dedicated worker - EventSource: onmessage</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var worker = new Worker('#')
+        worker.onmessage = function(e) {
+          test.step(function() {
+            assert_true(e.data[0], e.data[1])
+            assert_equals(e.data[1], "data", 'e.data')
+          })
+          test.done()
+        }
+      })
+    </script>
+  </body>
+</html>
+<!--*/ //-->