1 files changed, 41 insertions, 0 deletions
diff --git a/browser/base/content/test/zoom/browser_tooltip_zoom.js b/browser/base/content/test/zoom/browser_tooltip_zoom.js
new file mode 100644
index 0000000000..25388236f7
--- /dev/null
+++ b/browser/base/content/test/zoom/browser_tooltip_zoom.js
@@ -0,0 +1,41 @@
+add_task(async function test_zoom_tooltip() {
+  const TEST_PAGE_URL = 'data:text/html,<html title="tooltiptext">';
+  await BrowserTestUtils.withNewTab(TEST_PAGE_URL, async function(browser) {
+    FullZoom.setZoom(2.0, browser);
+
+    const tooltip = document.getElementById("remoteBrowserTooltip");
+    const popupShown = new Promise(resolve => {
+      tooltip.addEventListener("popupshown", resolve, { once: true });
+    });
+
+    // Fire a mousemove to trigger the tooltip.
+    // Margin from the anchor and stuff depends on the platform, but these
+    // should be big enough so that all platforms pass, but not big enough so
+    // that it'd pass even when messing up the coordinates would.
+    const DISTANCE = 300;
+    const EPSILON = 25;
+
+    EventUtils.synthesizeMouse(browser, DISTANCE, DISTANCE, {
+      type: "mousemove",
+    });
+
+    await popupShown;
+    ok(
+      true,
+      `popup should be shown (coords: ${tooltip.screenX}, ${tooltip.screenY})`
+    );
+
+    isfuzzy(
+      tooltip.screenX,
+      browser.screenX + DISTANCE,
+      EPSILON,
+      "Should be at the right x position, more or less"
+    );
+    isfuzzy(
+      tooltip.screenY,
+      browser.screenY + DISTANCE,
+      EPSILON,
+      "Should be at the right y position, more or less"
+    );
+  });
+});