1 files changed, 53 insertions, 0 deletions
diff --git a/devtools/client/shared/test/browser_html_tooltip_width-auto.js b/devtools/client/shared/test/browser_html_tooltip_width-auto.js
new file mode 100644
index 0000000000..8aaf969d36
--- /dev/null
+++ b/devtools/client/shared/test/browser_html_tooltip_width-auto.js
@@ -0,0 +1,53 @@
+/* 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 content can automatically calculate its width based on content.
+ */
+
+const HTML_NS = "http://www.w3.org/1999/xhtml";
+const TEST_URI = CHROME_URL_ROOT + "doc_html_tooltip.xhtml";
+
+const {
+  HTMLTooltip,
+} = require("resource://devtools/client/shared/widgets/tooltip/HTMLTooltip.js");
+loadHelperScript("helper_html_tooltip.js");
+
+let useXulWrapper;
+
+add_task(async function () {
+  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) {
+  const tooltip = new HTMLTooltip(doc, { useXulWrapper });
+  info("Create tooltip content width to 150px");
+  const tooltipContent = doc.createElementNS(HTML_NS, "div");
+  tooltipContent.style.cssText = "height: 100%; width: 150px; background: red;";
+
+  info("Set tooltip content using width:auto");
+  tooltip.panel.appendChild(tooltipContent);
+  tooltip.setContentSize({ width: "auto", height: 50 });
+
+  info("Show the tooltip and check the tooltip panel width.");
+  await showTooltip(tooltip, doc.getElementById("box1"));
+
+  const containerRect = tooltip.container.getBoundingClientRect();
+  is(containerRect.width, 150, "Tooltip container has the expected width.");
+
+  await hideTooltip(tooltip);
+
+  tooltip.destroy();
+}