1 files changed, 95 insertions, 0 deletions
diff --git a/browser/components/sessionstore/test/browser_707862.js b/browser/components/sessionstore/test/browser_707862.js
new file mode 100644
index 0000000000..765c63257f
--- /dev/null
+++ b/browser/components/sessionstore/test/browser_707862.js
@@ -0,0 +1,95 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
+
+var tabState = {
+  entries: [
+    {
+      url: "about:robots",
+      triggeringPrincipal_base64,
+      children: [{ url: "about:mozilla", triggeringPrincipal_base64 }],
+    },
+  ],
+};
+
+function test() {
+  waitForExplicitFinish();
+  requestLongerTimeout(2);
+
+  Services.prefs.setIntPref("browser.sessionstore.interval", 4000);
+  registerCleanupFunction(function () {
+    Services.prefs.clearUserPref("browser.sessionstore.interval");
+  });
+
+  let tab = BrowserTestUtils.addTab(gBrowser, "about:blank");
+
+  let browser = tab.linkedBrowser;
+
+  promiseTabState(tab, tabState).then(() => {
+    let entry;
+    if (!Services.appinfo.sessionHistoryInParent) {
+      let sessionHistory = browser.sessionHistory;
+      entry = sessionHistory.legacySHistory.getEntryAtIndex(0);
+    } else {
+      let sessionHistory = browser.browsingContext.sessionHistory;
+      entry = sessionHistory.getEntryAtIndex(0);
+    }
+
+    whenChildCount(entry, 1, function () {
+      whenChildCount(entry, 2, function () {
+        promiseBrowserLoaded(browser).then(() => {
+          let newEntry;
+          if (!Services.appinfo.sessionHistoryInParent) {
+            let newSessionHistory = browser.sessionHistory;
+            newEntry = newSessionHistory.legacySHistory.getEntryAtIndex(0);
+          } else {
+            let newSessionHistory = browser.browsingContext.sessionHistory;
+            newEntry = newSessionHistory.getEntryAtIndex(0);
+          }
+
+          whenChildCount(newEntry, 0, function () {
+            // Make sure that we reset the state.
+            let blankState = {
+              windows: [
+                {
+                  tabs: [
+                    {
+                      entries: [
+                        { url: "about:blank", triggeringPrincipal_base64 },
+                      ],
+                    },
+                  ],
+                },
+              ],
+            };
+            waitForBrowserState(blankState, finish);
+          });
+        });
+
+        // Force reload the browser to deprecate the subframes.
+        browser.reloadWithFlags(Ci.nsIWebNavigation.LOAD_FLAGS_BYPASS_CACHE);
+      });
+
+      // Create a dynamic subframe.
+      let doc = browser.contentDocument;
+      let iframe = doc.createElement("iframe");
+      doc.body.appendChild(iframe);
+      iframe.setAttribute("src", "about:mozilla");
+    });
+  });
+
+  // This test relies on the test timing out in order to indicate failure so
+  // let's add a dummy pass.
+  ok(
+    true,
+    "Each test requires at least one pass, fail or todo so here is a pass."
+  );
+}
+
+function whenChildCount(aEntry, aChildCount, aCallback) {
+  if (aEntry.childCount == aChildCount) {
+    aCallback();
+  } else {
+    setTimeout(() => whenChildCount(aEntry, aChildCount, aCallback), 100);
+  }
+}