1 files changed, 128 insertions, 0 deletions
diff --git a/dom/base/test/fullscreen/browser_fullscreen-navigation-history-race.js b/dom/base/test/fullscreen/browser_fullscreen-navigation-history-race.js
new file mode 100644
index 0000000000..2ea2b9ee40
--- /dev/null
+++ b/dom/base/test/fullscreen/browser_fullscreen-navigation-history-race.js
@@ -0,0 +1,128 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+requestLongerTimeout(2);
+
+// Import helpers
+Services.scriptloader.loadSubScript(
+  "chrome://mochitests/content/browser/dom/base/test/fullscreen/fullscreen_helpers.js",
+  this
+);
+
+// This test tends to trigger a race in the fullscreen time telemetry,
+// where the fullscreen enter and fullscreen exit events (which use the
+// same histogram ID) overlap. That causes TelemetryStopwatch to log an
+// error, bug 1742890.
+SimpleTest.ignoreAllUncaughtExceptions(true);
+
+add_setup(async function () {
+  await pushPrefs(
+    ["full-screen-api.transition-duration.enter", "0 0"],
+    ["full-screen-api.transition-duration.leave", "0 0"],
+    ["full-screen-api.allow-trusted-requests-only", false]
+  );
+});
+
+function preventBFCache(aBrowsingContext, aPrevent) {
+  return SpecialPowers.spawn(aBrowsingContext, [aPrevent], prevent => {
+    if (prevent) {
+      // Using a dummy onunload listener to disable the bfcache.
+      content.window.addEventListener("unload", () => {});
+    }
+    content.window.addEventListener(
+      "pagehide",
+      e => {
+        // XXX checking persisted property causes intermittent failures, so we
+        // dump the value instead, bug 1822263.
+        // is(e.persisted, !prevent, `Check BFCache state`);
+        info(`Check BFCache state: e.persisted is ${e.persisted}`);
+      },
+      { once: true }
+    );
+  });
+}
+
+[true, false].forEach(crossOrigin => {
+  [true, false].forEach(initialPagePreventsBFCache => {
+    [true, false].forEach(fullscreenPagePreventsBFCache => {
+      add_task(async function navigation_history() {
+        info(
+          `crossOrigin: ${crossOrigin}, initialPagePreventsBFCache: ${initialPagePreventsBFCache}, fullscreenPagePreventsBFCache: ${fullscreenPagePreventsBFCache}`
+        );
+        await BrowserTestUtils.withNewTab(
+          {
+            gBrowser,
+            url: "http://mochi.test:8888/browser/dom/base/test/fullscreen/dummy_page.html",
+          },
+          async function (browser) {
+            // Maybe prevent BFCache on initial page.
+            await preventBFCache(
+              browser.browsingContext,
+              initialPagePreventsBFCache
+            );
+
+            // Navigate to fullscreen page.
+            const url = crossOrigin
+              ? "https://example.org/browser/dom/base/test/fullscreen/file_fullscreen-iframe-inner.html"
+              : "http://mochi.test:8888/browser/dom/base/test/fullscreen/file_fullscreen-iframe-inner.html";
+            const loaded = BrowserTestUtils.browserLoaded(browser, false, url);
+            BrowserTestUtils.startLoadingURIString(browser, url);
+            await loaded;
+
+            // Maybe prevent BFCache on fullscreen test page.
+            await preventBFCache(
+              browser.browsingContext,
+              fullscreenPagePreventsBFCache
+            );
+
+            // Trigger click event to enter fullscreen.
+            await SpecialPowers.spawn(browser.browsingContext, [], () => {
+              let target = content.document.getElementById("div");
+              target.addEventListener(
+                "mousedown",
+                function (e) {
+                  content.window.history.back();
+                },
+                { once: true }
+              );
+              EventUtils.synthesizeMouseAtCenter(target, {}, content.window);
+            });
+
+            // Give some time for fullscreen transition.
+            await new Promise(aResolve => {
+              SimpleTest.executeSoon(() => {
+                SimpleTest.executeSoon(aResolve);
+              });
+            });
+
+            // Wait fullscreen exit event if browser is still in fullscreen mode.
+            if (
+              window.fullScreen ||
+              document.documentElement.hasAttribute("inFullscreen")
+            ) {
+              info("The widget is still in fullscreen, wait again");
+              await waitWidgetFullscreenEvent(window, false, true);
+            }
+            if (document.documentElement.hasAttribute("inDOMFullscreen")) {
+              info("The chrome document is still in fullscreen, wait again");
+              await waitForFullScreenObserver(window, false, true);
+            }
+
+            // Ensure the browser exits fullscreen state.
+            ok(!window.fullScreen, "The widget should not be in fullscreen");
+            ok(
+              !document.documentElement.hasAttribute("inFullscreen"),
+              "The chrome window should not be in fullscreen"
+            );
+            ok(
+              !document.documentElement.hasAttribute("inDOMFullscreen"),
+              "The chrome document should not be in fullscreen"
+            );
+          }
+        );
+      });
+    });
+  });
+});