1 files changed, 72 insertions, 0 deletions
diff --git a/browser/base/content/test/tabPrompts/browser_multiplePrompts.js b/browser/base/content/test/tabPrompts/browser_multiplePrompts.js
new file mode 100644
index 000000000..c548429ea
--- /dev/null
+++ b/browser/base/content/test/tabPrompts/browser_multiplePrompts.js
@@ -0,0 +1,72 @@
+"use strict";
+
+/*
+ * This test triggers multiple alerts on one single tab, because it"s possible
+ * for web content to do so. The behavior is described in bug 1266353.
+ *
+ * We assert the presentation of the multiple alerts, ensuring we show only
+ * the oldest one.
+ */
+add_task(function*() {
+  const PROMPTCOUNT = 5;
+
+  let contentScript = function() {
+    var i = 5; // contentScript has no access to PROMPTCOUNT.
+    window.addEventListener("message", function() {
+      i--;
+      if (i) {
+        window.postMessage("ping", "*");
+      }
+      alert("Alert countdown #" + i);
+    });
+    window.postMessage("ping", "*");
+  };
+  let url = "data:text/html,<script>(" + encodeURIComponent(contentScript.toSource()) + ")();</script>"
+
+  let promptsOpenedPromise = new Promise(function(resolve) {
+    let unopenedPromptCount = PROMPTCOUNT;
+    Services.obs.addObserver(function observer() {
+      unopenedPromptCount--;
+      if (!unopenedPromptCount) {
+        Services.obs.removeObserver(observer, "tabmodal-dialog-loaded");
+        info("Prompts opened.");
+        resolve();
+      }
+    }, "tabmodal-dialog-loaded", false);
+  });
+
+  let tab = yield BrowserTestUtils.openNewForegroundTab(gBrowser, url, true);
+  info("Tab loaded");
+
+  yield promptsOpenedPromise;
+
+  let promptsCount = PROMPTCOUNT;
+  while (promptsCount--) {
+    let prompts = tab.linkedBrowser.parentNode.querySelectorAll("tabmodalprompt");
+    is(prompts.length, promptsCount + 1, "There should be " + (promptsCount + 1) + " prompt(s).");
+    // The oldest should be the first.
+    let i = 0;
+    for (let prompt of prompts) {
+      is(prompt.Dialog.args.text, "Alert countdown #" + i, "The #" + i + " alert should be labelled as such.");
+      if (i !== promptsCount) {
+        is(prompt.hidden, true, "This prompt should be hidden.");
+        i++;
+        continue;
+      }
+
+      is(prompt.hidden, false, "The last prompt should not be hidden.");
+      prompt.onButtonClick(0);
+
+      // The click is handled async; wait for an event loop turn for that to
+      // happen.
+      yield new Promise(function(resolve) {
+        Services.tm.mainThread.dispatch(resolve, Ci.nsIThread.DISPATCH_NORMAL);
+      });
+    }
+  }
+
+  let prompts = tab.linkedBrowser.parentNode.querySelectorAll("tabmodalprompt");
+  is(prompts.length, 0, "Prompts should all be dismissed.");
+
+  yield BrowserTestUtils.removeTab(tab);
+});