1 files changed, 76 insertions, 0 deletions
diff --git a/devtools/client/shared/test/browser_html_tooltip_doorhanger-02.js b/devtools/client/shared/test/browser_html_tooltip_doorhanger-02.js
new file mode 100644
index 0000000000..b1564f698c
--- /dev/null
+++ b/devtools/client/shared/test/browser_html_tooltip_doorhanger-02.js
@@ -0,0 +1,76 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+/* import-globals-from helper_html_tooltip.js */
+
+"use strict";
+
+/**
+ * Test the HTMLTooltip "doorhanger" type's arrow tip is precisely centered on
+ * the anchor when the anchor is small.
+ */
+
+const HTML_NS = "http://www.w3.org/1999/xhtml";
+const TEST_URI = CHROME_URL_ROOT + "doc_html_tooltip_doorhanger-02.xhtml";
+
+const {
+  HTMLTooltip,
+} = require("resource://devtools/client/shared/widgets/tooltip/HTMLTooltip.js");
+loadHelperScript("helper_html_tooltip.js");
+
+let useXulWrapper;
+
+add_task(async function () {
+  // Force the toolbox to be 200px high;
+  await pushPref("devtools.toolbox.footer.height", 200);
+
+  await addTab("about:blank");
+  const { doc } = await createHost("bottom", TEST_URI);
+
+  info("Run tests for a Tooltip without using a XUL panel");
+  useXulWrapper = false;
+  await runTests(doc);
+
+  info("Run tests for a Tooltip with a XUL panel");
+  useXulWrapper = true;
+  await runTests(doc);
+});
+
+async function runTests(doc) {
+  info("Create HTML tooltip");
+  const tooltip = new HTMLTooltip(doc, { type: "doorhanger", useXulWrapper });
+  const div = doc.createElementNS(HTML_NS, "div");
+  div.style.width = "200px";
+  div.style.height = "35px";
+  tooltip.panel.appendChild(div);
+
+  const elements = [...doc.querySelectorAll(".anchor")];
+  for (const el of elements) {
+    info("Display the tooltip on an anchor.");
+    await showTooltip(tooltip, el);
+
+    const arrow = tooltip.arrow;
+    ok(arrow, "Tooltip has an arrow");
+
+    // Get the geometry of the anchor and arrow.
+    const anchorBounds = el.getBoxQuads({ relativeTo: doc })[0].getBounds();
+    const arrowBounds = arrow.getBoxQuads({ relativeTo: doc })[0].getBounds();
+
+    // Compare the centers
+    const center = bounds => bounds.left + bounds.width / 2;
+    const delta = Math.abs(center(anchorBounds) - center(arrowBounds));
+    const describeBounds = bounds =>
+      `${bounds.left}<--[${center(bounds)}]-->${bounds.right}`;
+    const params =
+      `anchor: ${describeBounds(anchorBounds)}, ` +
+      `arrow: ${describeBounds(arrowBounds)}`;
+    Assert.lessOrEqual(
+      delta,
+      1,
+      `Arrow center is roughly aligned with anchor center (${params})`
+    );
+
+    await hideTooltip(tooltip);
+  }
+
+  tooltip.destroy();
+}