Bug 1407945: Add a test for the tooltip in RDM. r=pbro

Differential Revision: https://phabricator.services.mozilla.com/D38827

--HG--
extra : moz-landing-system : lando

devtools/client/responsive.html/test/browser/browser.ini

@@ -76,6 +76,8 @@ skip-if = fission
 skip-if = os == "linux" || os == "mac" # Bug 1498336
 [browser_toolbox_swap_browsers.js]
 [browser_toolbox_swap_inspector.js]
+[browser_tooltip.js]
+skip-if = os == "mac" && debug # Bug 1569508
 [browser_touch_device.js]
 [browser_touch_does_not_trigger_hover_states.js]
 [browser_touch_simulation.js]

devtools/client/responsive.html/test/browser/browser_tooltip.js

@@ -0,0 +1,35 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const TEST_CONTENT = `<h1 title="test title">test h1</h1>`;
+const TEST_URL = `data:text/html;charset=utf-8,${ TEST_CONTENT }`;
+
+// Test for the tooltip coordinate on the browsing document in RDM.
+
+addRDMTask(TEST_URL, async ({ ui }) => {
+  await injectEventUtilsInContentTask(ui.getViewportBrowser());
+
+  info("Show a tooltip");
+  await spawnViewportTask(ui, {}, async () => {
+    const target = content.document.querySelector("h1");
+    await EventUtils.synthesizeMouse(
+      target, 1, 1, { type: "mouseover", isSynthesized: false }, content
+    );
+    await EventUtils.synthesizeMouse(
+      target, 2, 1, { type: "mousemove", isSynthesized: false }, content
+    );
+    await EventUtils.synthesizeMouse(
+      target, 3, 1, { type: "mousemove", isSynthesized: false }, content
+    );
+  });
+
+  info("Wait for showing the tooltip");
+  const tooltip =
+    ui.browserWindow.gBrowser.ownerDocument.getElementById("remoteBrowserTooltip");
+  await waitUntil(() => tooltip.state === "open");
+
+  info("Test the X coordinate of the tooltip");
+  isnot(tooltip.screenX, 0, "The X coordinate of tooltip should not be 0");
+});