1 files changed, 49 insertions, 0 deletions
diff --git a/browser/base/content/test/general/browser_minimize.js b/browser/base/content/test/general/browser_minimize.js
new file mode 100644
index 0000000000..a57fea079c
--- /dev/null
+++ b/browser/base/content/test/general/browser_minimize.js
@@ -0,0 +1,49 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+add_task(async function () {
+  registerCleanupFunction(function () {
+    window.restore();
+  });
+  function isActive() {
+    return gBrowser.selectedTab.linkedBrowser.docShellIsActive;
+  }
+
+  ok(isActive(), "Docshell should be active when starting the test");
+  ok(!document.hidden, "Top level window should be visible");
+
+  info("Calling window.minimize");
+  let promiseSizeModeChange = BrowserTestUtils.waitForEvent(
+    window,
+    "sizemodechange"
+  );
+  window.minimize();
+  await promiseSizeModeChange;
+  ok(!isActive(), "Docshell should be Inactive");
+  ok(document.hidden, "Top level window should be hidden");
+
+  info("Calling window.restore");
+  promiseSizeModeChange = BrowserTestUtils.waitForEvent(
+    window,
+    "sizemodechange"
+  );
+  window.restore();
+  // On Ubuntu `window.restore` doesn't seem to work, use a timer to make the
+  // test fail faster and more cleanly than with a test timeout.
+  await Promise.race([
+    promiseSizeModeChange,
+    new Promise((resolve, reject) =>
+      // eslint-disable-next-line mozilla/no-arbitrary-setTimeout
+      setTimeout(() => {
+        reject("timed out waiting for sizemodechange event");
+      }, 5000)
+    ),
+  ]);
+  // The sizemodechange event can sometimes be fired before the
+  // occlusionstatechange event, especially in chaos mode.
+  if (window.isFullyOccluded) {
+    await BrowserTestUtils.waitForEvent(window, "occlusionstatechange");
+  }
+  ok(isActive(), "Docshell should be active again");
+  ok(!document.hidden, "Top level window should be visible");
+});