1 files changed, 66 insertions, 0 deletions
diff --git a/browser/components/preferences/tests/browser_searchScroll.js b/browser/components/preferences/tests/browser_searchScroll.js
new file mode 100644
index 0000000000..ef3af646e9
--- /dev/null
+++ b/browser/components/preferences/tests/browser_searchScroll.js
@@ -0,0 +1,66 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+Services.scriptloader.loadSubScript(
+  "chrome://mochitests/content/browser/gfx/layers/apz/test/mochitest/apz_test_native_event_utils.js",
+  this
+);
+
+const { AddonTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/AddonTestUtils.sys.mjs"
+);
+const { SearchTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/SearchTestUtils.sys.mjs"
+);
+const { SearchUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/SearchUtils.sys.mjs"
+);
+
+AddonTestUtils.initMochitest(this);
+SearchTestUtils.init(this);
+
+add_setup(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["dom.w3c_touch_events.enabled", 0]],
+  });
+});
+
+add_task(async function test_scroll() {
+  info("Open preferences page for search");
+  await openPreferencesViaOpenPreferencesAPI("search", { leaveOpen: true });
+
+  const doc = gBrowser.selectedBrowser.contentDocument;
+  const tree = doc.querySelector("#engineList");
+
+  info("Add engines to make the tree scrollable");
+  for (let i = 0, n = parseInt(tree.getAttribute("rows")); i < n; i++) {
+    let extension = await SearchTestUtils.installSearchExtension({
+      id: `${i}@tests.mozilla.org`,
+      name: `example${i}`,
+      version: "1.0",
+      keyword: `example${i}`,
+    });
+    await AddonTestUtils.waitForSearchProviderStartup(extension);
+  }
+
+  info("Make tree element move into viewport");
+  const mainContent = doc.querySelector(".main-content");
+  const readyForScrollIntoView = new Promise(r => {
+    mainContent.addEventListener("scroll", r, { once: true });
+  });
+  tree.scrollIntoView();
+  await readyForScrollIntoView;
+
+  const previousScroll = mainContent.scrollTop;
+
+  await promiseMoveMouseAndScrollWheelOver(tree, 1, 1, false);
+
+  Assert.equal(
+    previousScroll,
+    mainContent.scrollTop,
+    "Container element does not scroll"
+  );
+
+  info("Clean up");
+  gBrowser.removeCurrentTab();
+});