1 files changed, 83 insertions, 0 deletions
diff --git a/testing/web-platform/tests/xhr/resources/xmlhttprequest-event-order.js b/testing/web-platform/tests/xhr/resources/xmlhttprequest-event-order.js
new file mode 100644
index 0000000000..b6bb6cdf3c
--- /dev/null
+++ b/testing/web-platform/tests/xhr/resources/xmlhttprequest-event-order.js
@@ -0,0 +1,83 @@
+(function(global) {
+  var recorded_xhr_events = [];
+
+  function record_xhr_event(e) {
+    var prefix = e.target instanceof XMLHttpRequestUpload ? "upload." : "";
+    recorded_xhr_events.push((prefix || "") + e.type + "(" + e.loaded + "," + e.total + "," + e.lengthComputable + ")");
+  }
+
+  global.prepare_xhr_for_event_order_test = function(xhr) {
+    xhr.addEventListener("readystatechange", function(e) {
+      recorded_xhr_events.push(xhr.readyState);
+    });
+    var events = ["loadstart", "progress", "abort", "timeout", "error", "load", "loadend"];
+    for(var i=0; i<events.length; ++i) {
+      xhr.addEventListener(events[i], record_xhr_event);
+    }
+    if ("upload" in xhr) {
+      for(var i=0; i<events.length; ++i) {
+        xhr.upload.addEventListener(events[i], record_xhr_event);
+      }
+    }
+  }
+
+  function getNextEvent(arr) {
+    var event = { str: arr.shift() };
+
+    // we can only handle strings, numbers (readystates) and undefined
+    if (event.str === undefined) {
+      return event;
+    }
+
+    if (typeof event.str !== "string") {
+      if (Number.isInteger(event.str)) {
+        event.state = event.str;
+        event.str = "readystatechange(" + event.str + ")";
+      } else {
+        throw "Test error: unexpected event type " + event.str;
+      }
+    }
+
+    // parse out the general type, loaded and total values
+    var type = event.type = event.str.split("(")[0].split(".").pop();
+    var loadedAndTotal = event.str.match(/.*\((\d+),(\d+),(true|false)\)/);
+    if (loadedAndTotal) {
+      event.loaded = parseInt(loadedAndTotal[1]);
+      event.total = parseInt(loadedAndTotal[2]);
+      event.lengthComputable = loadedAndTotal[3] == "true";
+    }
+
+    return event;
+  }
+
+  global.assert_xhr_event_order_matches = function(expected) {
+    var recorded = recorded_xhr_events;
+    var lastRecordedLoaded = -1;
+    while(expected.length && recorded.length) {
+      var currentExpected = getNextEvent(expected),
+          currentRecorded = getNextEvent(recorded);
+
+      // skip to the last progress event if we've hit one (note the next
+      // event after a progress event should be a LOADING readystatechange,
+      // if there are multiple progress events in a row).
+      while (recorded.length && currentRecorded.type == "progress" &&
+             parseInt(recorded) === 3) {
+        assert_greater_than(currentRecorded.loaded, lastRecordedLoaded,
+                            "progress event 'loaded' values must only increase");
+        lastRecordedLoaded = currentRecorded.loaded;
+      }
+      if (currentRecorded.type == "loadend") {
+        recordedProgressCount = 0;
+        lastRecordedLoaded = -1;
+      }
+
+      assert_equals(currentRecorded.str, currentExpected.str);
+    }
+    if (recorded.length) {
+      throw "\nUnexpected extra events: " + recorded.join(", ");
+    }
+    if (expected.length) {
+      throw "\nExpected more events: " + expected.join(", ");
+    }
+  }
+}(this));