1 files changed, 119 insertions, 0 deletions
diff --git a/devtools/client/webconsole/test/browser_webconsole_bug_613642_maintain_scroll.js b/devtools/client/webconsole/test/browser_webconsole_bug_613642_maintain_scroll.js
new file mode 100644
index 000000000..e24ce28e2
--- /dev/null
+++ b/devtools/client/webconsole/test/browser_webconsole_bug_613642_maintain_scroll.js
@@ -0,0 +1,119 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+var TEST_URI = "data:text/html;charset=utf-8,Web Console test for " +
+               "bug 613642: remember scroll location";
+
+add_task(function* () {
+  yield loadTab(TEST_URI);
+
+  let hud = yield openConsole();
+
+  hud.jsterm.clearOutput();
+  let outputNode = hud.outputNode;
+  let scrollBox = hud.ui.outputWrapper;
+
+  for (let i = 0; i < 150; i++) {
+    ContentTask.spawn(gBrowser.selectedBrowser, i, function* (num) {
+      content.console.log("test message " + num);
+    });
+  }
+
+  yield waitForMessages({
+    webconsole: hud,
+    messages: [{
+      text: "test message 149",
+      category: CATEGORY_WEBDEV,
+      severity: SEVERITY_LOG,
+    }],
+  });
+
+  ok(scrollBox.scrollTop > 0, "scroll location is not at the top");
+
+  // scroll to the first node
+  outputNode.focus();
+
+  let scrolled = promise.defer();
+
+  scrollBox.onscroll = () => {
+    info("onscroll top " + scrollBox.scrollTop);
+    if (scrollBox.scrollTop != 0) {
+      // Wait for scroll to 0.
+      return;
+    }
+    scrollBox.onscroll = null;
+    is(scrollBox.scrollTop, 0, "scroll location updated (moved to top)");
+    scrolled.resolve();
+  };
+  EventUtils.synthesizeKey("VK_HOME", {}, hud.iframeWindow);
+
+  yield scrolled.promise;
+
+  // add a message and make sure scroll doesn't change
+  ContentTask.spawn(gBrowser.selectedBrowser, null,
+    "() => content.console.log('test message 150')");
+
+  yield waitForMessages({
+    webconsole: hud,
+    messages: [{
+      text: "test message 150",
+      category: CATEGORY_WEBDEV,
+      severity: SEVERITY_LOG,
+    }],
+  });
+
+  scrolled = promise.defer();
+  scrollBox.onscroll = () => {
+    if (scrollBox.scrollTop != 0) {
+      // Wait for scroll to stabilize at the top.
+      return;
+    }
+    scrollBox.onscroll = null;
+    is(scrollBox.scrollTop, 0, "scroll location is still at the top");
+    scrolled.resolve();
+  };
+
+  // Make sure that scroll stabilizes at the top. executeSoon() is needed for
+  // the yield to work.
+  executeSoon(scrollBox.onscroll);
+
+  yield scrolled.promise;
+
+  // scroll back to the bottom
+  outputNode.lastChild.focus();
+
+  scrolled = promise.defer();
+  scrollBox.onscroll = () => {
+    if (scrollBox.scrollTop == 0) {
+      // Wait for scroll to bottom.
+      return;
+    }
+    scrollBox.onscroll = null;
+    isnot(scrollBox.scrollTop, 0, "scroll location updated (moved to bottom)");
+    scrolled.resolve();
+  };
+  EventUtils.synthesizeKey("VK_END", {});
+  yield scrolled.promise;
+
+  let oldScrollTop = scrollBox.scrollTop;
+
+  ContentTask.spawn(gBrowser.selectedBrowser, null,
+    "() => content.console.log('test message 151')");
+
+  scrolled = promise.defer();
+  scrollBox.onscroll = () => {
+    if (scrollBox.scrollTop == oldScrollTop) {
+      // Wait for scroll to change.
+      return;
+    }
+    scrollBox.onscroll = null;
+    isnot(scrollBox.scrollTop, oldScrollTop,
+          "scroll location updated (moved to bottom again)");
+    scrolled.resolve();
+  };
+  yield scrolled.promise;
+});