1 files changed, 104 insertions, 0 deletions
diff --git a/devtools/client/inspector/markup/test/browser_markup_events-overflow.js b/devtools/client/inspector/markup/test/browser_markup_events-overflow.js
new file mode 100644
index 0000000000..ab7819f78b
--- /dev/null
+++ b/devtools/client/inspector/markup/test/browser_markup_events-overflow.js
@@ -0,0 +1,104 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+const TEST_URL = URL_ROOT + "doc_markup_events-overflow.html";
+const TEST_DATA = [
+  {
+    desc: "editor overflows container",
+    // scroll to bottom
+    initialScrollTop: -1,
+    // last header
+    headerToClick: 49,
+    alignBottom: true,
+    alignTop: false,
+  },
+  {
+    desc: "header overflows the container",
+    initialScrollTop: 2,
+    headerToClick: 0,
+    alignBottom: false,
+    alignTop: true,
+  },
+  {
+    desc: "neither header nor editor overflows the container",
+    initialScrollTop: 2,
+    headerToClick: 5,
+    alignBottom: false,
+    alignTop: false,
+  },
+];
+
+add_task(async function () {
+  const { inspector } = await openInspectorForURL(TEST_URL);
+
+  const markupContainer = await getContainerForSelector("#events", inspector);
+  const evHolder = markupContainer.elt.querySelector(
+    ".inspector-badge.interactive[data-event]"
+  );
+  const tooltip = inspector.markup.eventDetailsTooltip;
+
+  info("Clicking to open event tooltip.");
+  EventUtils.synthesizeMouseAtCenter(
+    evHolder,
+    {},
+    inspector.markup.doc.defaultView
+  );
+  await tooltip.once("shown");
+  info("EventTooltip visible.");
+
+  const container = tooltip.panel;
+  const containerRect = container.getBoundingClientRect();
+  const headers = container.querySelectorAll(".event-header");
+
+  for (const data of TEST_DATA) {
+    info("Testing scrolling when " + data.desc);
+
+    if (data.initialScrollTop < 0) {
+      info("Scrolling container to the bottom.");
+      const newScrollTop = container.scrollHeight - container.clientHeight;
+      data.initialScrollTop = container.scrollTop = newScrollTop;
+    } else {
+      info("Scrolling container by " + data.initialScrollTop + "px");
+      container.scrollTop = data.initialScrollTop;
+    }
+
+    is(container.scrollTop, data.initialScrollTop, "Container scrolled.");
+
+    info("Clicking on header #" + data.headerToClick);
+    const header = headers[data.headerToClick];
+
+    const ready = tooltip.once("event-tooltip-ready");
+    EventUtils.synthesizeMouseAtCenter(header, {}, header.ownerGlobal);
+    await ready;
+
+    info("Event handler expanded.");
+
+    // Wait for any scrolling to finish.
+    await promiseNextTick();
+
+    if (data.alignTop) {
+      const headerRect = header.getBoundingClientRect();
+
+      is(
+        Math.round(headerRect.top),
+        Math.round(containerRect.top),
+        "Clicked header is aligned with the container top."
+      );
+    } else if (data.alignBottom) {
+      const editorRect = header.nextElementSibling.getBoundingClientRect();
+
+      is(
+        Math.round(editorRect.bottom),
+        Math.round(containerRect.bottom),
+        "Clicked event handler code is aligned with the container bottom."
+      );
+    } else {
+      is(
+        container.scrollTop,
+        data.initialScrollTop,
+        "Container did not scroll, as expected."
+      );
+    }
+  }
+});