1 files changed, 75 insertions, 0 deletions
diff --git a/devtools/client/netmonitor/test/browser_net_autoscroll.js b/devtools/client/netmonitor/test/browser_net_autoscroll.js
new file mode 100644
index 000000000..9abb3fd17
--- /dev/null
+++ b/devtools/client/netmonitor/test/browser_net_autoscroll.js
@@ -0,0 +1,75 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Bug 863102 - Automatically scroll down upon new network requests.
+ */
+add_task(function* () {
+  requestLongerTimeout(2);
+
+  let { monitor } = yield initNetMonitor(INFINITE_GET_URL);
+  let win = monitor.panelWin;
+  let topNode = win.document.getElementById("requests-menu-contents");
+  let requestsContainer = topNode.getElementsByTagName("scrollbox")[0];
+  ok(!!requestsContainer, "Container element exists as expected.");
+
+  // (1) Check that the scroll position is maintained at the bottom
+  // when the requests overflow the vertical size of the container.
+  yield waitForRequestsToOverflowContainer();
+  yield waitForScroll();
+  ok(scrolledToBottom(requestsContainer), "Scrolled to bottom on overflow.");
+
+  // (2) Now set the scroll position somewhere in the middle and check
+  // that additional requests do not change the scroll position.
+  let children = requestsContainer.childNodes;
+  let middleNode = children.item(children.length / 2);
+  middleNode.scrollIntoView();
+  ok(!scrolledToBottom(requestsContainer), "Not scrolled to bottom.");
+  // save for comparison later
+  let scrollTop = requestsContainer.scrollTop;
+  yield waitForNetworkEvents(monitor, 8);
+  yield waitSomeTime();
+  is(requestsContainer.scrollTop, scrollTop, "Did not scroll.");
+
+  // (3) Now set the scroll position back at the bottom and check that
+  // additional requests *do* cause the container to scroll down.
+  requestsContainer.scrollTop = requestsContainer.scrollHeight;
+  ok(scrolledToBottom(requestsContainer), "Set scroll position to bottom.");
+  yield waitForNetworkEvents(monitor, 8);
+  yield waitForScroll();
+  ok(scrolledToBottom(requestsContainer), "Still scrolled to bottom.");
+
+  // (4) Now select an item in the list and check that additional requests
+  // do not change the scroll position.
+  monitor.panelWin.NetMonitorView.RequestsMenu.selectedIndex = 0;
+  yield waitForNetworkEvents(monitor, 8);
+  yield waitSomeTime();
+  is(requestsContainer.scrollTop, 0, "Did not scroll.");
+
+  // Done: clean up.
+  yield teardown(monitor);
+
+  function* waitForRequestsToOverflowContainer() {
+    while (true) {
+      yield waitForNetworkEvents(monitor, 1);
+      if (requestsContainer.scrollHeight > requestsContainer.clientHeight) {
+        return;
+      }
+    }
+  }
+
+  function scrolledToBottom(element) {
+    return element.scrollTop + element.clientHeight >= element.scrollHeight;
+  }
+
+  function waitSomeTime() {
+    // Wait to make sure no scrolls happen
+    return wait(50);
+  }
+
+  function waitForScroll() {
+    return monitor._view.RequestsMenu.widget.once("scroll-to-bottom");
+  }
+});