1 files changed, 271 insertions, 0 deletions
diff --git a/docshell/test/browser/head_browser_onbeforeunload.js b/docshell/test/browser/head_browser_onbeforeunload.js
new file mode 100644
index 0000000000..6bb334b793
--- /dev/null
+++ b/docshell/test/browser/head_browser_onbeforeunload.js
@@ -0,0 +1,271 @@
+"use strict";
+
+const BASE_URL = "http://mochi.test:8888/browser/docshell/test/browser/";
+
+const TEST_PAGE = BASE_URL + "file_onbeforeunload_0.html";
+
+const CONTENT_PROMPT_SUBDIALOG = Services.prefs.getBoolPref(
+  "prompts.contentPromptSubDialog",
+  false
+);
+
+const { PromptTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/PromptTestUtils.sys.mjs"
+);
+
+async function withTabModalPromptCount(expected, task) {
+  const DIALOG_TOPIC = CONTENT_PROMPT_SUBDIALOG
+    ? "common-dialog-loaded"
+    : "tabmodal-dialog-loaded";
+
+  let count = 0;
+  function observer() {
+    count++;
+  }
+
+  Services.obs.addObserver(observer, DIALOG_TOPIC);
+  try {
+    return await task();
+  } finally {
+    Services.obs.removeObserver(observer, DIALOG_TOPIC);
+    is(count, expected, "Should see expected number of tab modal prompts");
+  }
+}
+
+function promiseAllowUnloadPrompt(browser, allowNavigation) {
+  return PromptTestUtils.handleNextPrompt(
+    browser,
+    { modalType: Services.prompt.MODAL_TYPE_CONTENT, promptType: "confirmEx" },
+    { buttonNumClick: allowNavigation ? 0 : 1 }
+  );
+}
+
+// Maintain a pool of background tabs with our test document loaded so
+// we don't have to wait for a load prior to each test step (potentially
+// tearing down and recreating content processes in the process).
+const TabPool = {
+  poolSize: 5,
+
+  pendingCount: 0,
+
+  readyTabs: [],
+
+  readyPromise: null,
+  resolveReadyPromise: null,
+
+  spawnTabs() {
+    while (this.pendingCount + this.readyTabs.length < this.poolSize) {
+      this.pendingCount++;
+      let tab = BrowserTestUtils.addTab(gBrowser, TEST_PAGE);
+      BrowserTestUtils.browserLoaded(tab.linkedBrowser).then(() => {
+        this.readyTabs.push(tab);
+        this.pendingCount--;
+
+        if (this.resolveReadyPromise) {
+          this.readyPromise = null;
+          this.resolveReadyPromise();
+          this.resolveReadyPromise = null;
+        }
+
+        this.spawnTabs();
+      });
+    }
+  },
+
+  getReadyPromise() {
+    if (!this.readyPromise) {
+      this.readyPromise = new Promise(resolve => {
+        this.resolveReadyPromise = resolve;
+      });
+    }
+    return this.readyPromise;
+  },
+
+  async getTab() {
+    while (!this.readyTabs.length) {
+      this.spawnTabs();
+      await this.getReadyPromise();
+    }
+
+    let tab = this.readyTabs.shift();
+    this.spawnTabs();
+
+    gBrowser.selectedTab = tab;
+    return tab;
+  },
+
+  async cleanup() {
+    this.poolSize = 0;
+
+    while (this.pendingCount) {
+      await this.getReadyPromise();
+    }
+
+    while (this.readyTabs.length) {
+      await BrowserTestUtils.removeTab(this.readyTabs.shift());
+    }
+  },
+};
+
+const ACTIONS = {
+  NONE: 0,
+  LISTEN_AND_ALLOW: 1,
+  LISTEN_AND_BLOCK: 2,
+};
+
+const ACTION_NAMES = new Map(Object.entries(ACTIONS).map(([k, v]) => [v, k]));
+
+function* generatePermutations(depth) {
+  if (depth == 0) {
+    yield [];
+    return;
+  }
+  for (let subActions of generatePermutations(depth - 1)) {
+    for (let action of Object.values(ACTIONS)) {
+      yield [action, ...subActions];
+    }
+  }
+}
+
+const PERMUTATIONS = Array.from(generatePermutations(4));
+
+const FRAMES = [
+  { process: 0 },
+  { process: SpecialPowers.useRemoteSubframes ? 1 : 0 },
+  { process: 0 },
+  { process: SpecialPowers.useRemoteSubframes ? 1 : 0 },
+];
+
+function addListener(bc, block) {
+  return SpecialPowers.spawn(bc, [block], block => {
+    return new Promise(resolve => {
+      function onbeforeunload(event) {
+        if (block) {
+          event.preventDefault();
+        }
+        resolve({ event: "beforeunload" });
+      }
+      content.addEventListener("beforeunload", onbeforeunload, { once: true });
+      content.unlisten = () => {
+        content.removeEventListener("beforeunload", onbeforeunload);
+      };
+
+      content.addEventListener(
+        "unload",
+        () => {
+          resolve({ event: "unload" });
+        },
+        { once: true }
+      );
+    });
+  });
+}
+
+function descendants(bc) {
+  if (bc) {
+    return [bc, ...descendants(bc.children[0])];
+  }
+  return [];
+}
+
+async function addListeners(frames, actions, startIdx) {
+  let process = startIdx >= 0 ? FRAMES[startIdx].process : -1;
+
+  let roundTripPromises = [];
+
+  let expectNestedEventLoop = false;
+  let numBlockers = 0;
+  let unloadPromises = [];
+  let beforeUnloadPromises = [];
+
+  for (let [i, frame] of frames.entries()) {
+    let action = actions[i];
+    if (action === ACTIONS.NONE) {
+      continue;
+    }
+
+    let block = action === ACTIONS.LISTEN_AND_BLOCK;
+    let promise = addListener(frame, block);
+    if (startIdx <= i) {
+      if (block || FRAMES[i].process !== process) {
+        expectNestedEventLoop = true;
+      }
+      beforeUnloadPromises.push(promise);
+      numBlockers += block;
+    } else {
+      unloadPromises.push(promise);
+    }
+
+    roundTripPromises.push(SpecialPowers.spawn(frame, [], () => {}));
+  }
+
+  // Wait for round trip messages to any processes with event listeners to
+  // return so we're sure that all listeners are registered and their state
+  // flags are propagated before we continue.
+  await Promise.all(roundTripPromises);
+
+  return {
+    expectNestedEventLoop,
+    expectPrompt: !!numBlockers,
+    unloadPromises,
+    beforeUnloadPromises,
+  };
+}
+
+async function doTest(actions, startIdx, navigate) {
+  let tab = await TabPool.getTab();
+  let browser = tab.linkedBrowser;
+
+  let frames = descendants(browser.browsingContext);
+  let expected = await addListeners(frames, actions, startIdx);
+
+  let awaitingPrompt = false;
+  let promptPromise;
+  if (expected.expectPrompt) {
+    awaitingPrompt = true;
+    promptPromise = promiseAllowUnloadPrompt(browser, false).then(() => {
+      awaitingPrompt = false;
+    });
+  }
+
+  let promptCount = expected.expectPrompt ? 1 : 0;
+  await withTabModalPromptCount(promptCount, async () => {
+    await navigate(tab, frames).then(result => {
+      ok(
+        !awaitingPrompt,
+        "Navigation should not complete while we're still expecting a prompt"
+      );
+
+      is(
+        result.eventLoopSpun,
+        expected.expectNestedEventLoop,
+        "Should have nested event loop?"
+      );
+    });
+
+    for (let result of await Promise.all(expected.beforeUnloadPromises)) {
+      is(
+        result.event,
+        "beforeunload",
+        "Should have seen beforeunload event before unload"
+      );
+    }
+    await promptPromise;
+
+    await Promise.all(
+      frames.map(frame =>
+        SpecialPowers.spawn(frame, [], () => {
+          if (content.unlisten) {
+            content.unlisten();
+          }
+        }).catch(() => {})
+      )
+    );
+
+    await BrowserTestUtils.removeTab(tab);
+  });
+
+  for (let result of await Promise.all(expected.unloadPromises)) {
+    is(result.event, "unload", "Should have seen unload event");
+  }
+}