1 files changed, 51 insertions, 0 deletions
diff --git a/browser/base/content/test/popups/browser_popup_new_window_resize.js b/browser/base/content/test/popups/browser_popup_new_window_resize.js
new file mode 100644
index 0000000000..81d3cf5a9a
--- /dev/null
+++ b/browser/base/content/test/popups/browser_popup_new_window_resize.js
@@ -0,0 +1,51 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+add_task(async function test_new_window_resize() {
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    window.gBrowser,
+    "https://example.net"
+  );
+
+  await SpecialPowers.spawn(tab.linkedBrowser, [], async () => {
+    info("Opening popup.");
+    let win = this.content.open(
+      "https://example.net",
+      "",
+      "width=200,height=200"
+    );
+
+    await ContentTaskUtils.waitForEvent(win, "load");
+
+    let { outerWidth: initialWidth, outerHeight: initialHeight } = win;
+    let targetWidth = initialWidth + 100;
+    let targetHeight = initialHeight + 100;
+
+    let observedOurResizeEvent = false;
+    let resizeListener = () => {
+      let { outerWidth: currentWidth, outerHeight: currentHeight } = win;
+      info(`Resize event for ${currentWidth}x${currentHeight}.`);
+      if (currentWidth == targetWidth && currentHeight == targetHeight) {
+        ok(!observedOurResizeEvent, "First time we receive our resize event.");
+        observedOurResizeEvent = true;
+      }
+    };
+    win.addEventListener("resize", resizeListener);
+    win.resizeTo(targetWidth, targetHeight);
+
+    await ContentTaskUtils.waitForCondition(
+      () => observedOurResizeEvent,
+      `Waiting for our resize event (${targetWidth}x${targetHeight}).`
+    );
+
+    info("Waiting for potentially incoming resize events.");
+    for (let i = 0; i < 10; i++) {
+      await new Promise(r => win.requestAnimationFrame(r));
+    }
+    win.removeEventListener("resize", resizeListener);
+    info("Closing popup.");
+    win.close();
+  });
+
+  await BrowserTestUtils.removeTab(tab);
+});