1 files changed, 131 insertions, 0 deletions
diff --git a/docshell/test/navigation/test_bug1375833.html b/docshell/test/navigation/test_bug1375833.html
new file mode 100644
index 0000000000..c2a7750a4e
--- /dev/null
+++ b/docshell/test/navigation/test_bug1375833.html
@@ -0,0 +1,131 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1375833
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1375833</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript">
+
+    SimpleTest.waitForExplicitFinish();
+
+    /**
+     * Test for Bug 1375833. It tests for 2 things in a normal reload -
+     * 1. Static frame history should not be dropped.
+     * 2. In a reload, docshell would parse the reloaded root document and
+     *    genearate new child docshells, and then use the child offset
+     */
+
+    let testWin = window.open("file_bug1375833.html");
+    let count = 0;
+    let webNav, shistory;
+    let frameDocShellId;
+    let chromeScript = null;
+    if (SpecialPowers.Services.appinfo.sessionHistoryInParent) {
+      chromeScript = SpecialPowers.loadChromeScript(() => {
+        /* eslint-env mozilla/chrome-script */
+        function doSend(message, fn) {
+          try {
+            sendAsyncMessage(message, {success: true, value: fn()});
+          } catch(_) {
+            sendAsyncMessage(message, {success: false});
+          }
+        }
+
+        addMessageListener("test1", id => {
+          doSend("test1", () => {
+            let sessionHistory = BrowsingContext.get(id).top.sessionHistory;
+            let entry = sessionHistory.getEntryAtIndex(sessionHistory.index);
+            let frameEntry = entry.GetChildAt(0);
+            return String(frameEntry.docshellID);
+          })
+        });
+      });
+    }
+
+    window.addEventListener("message", async e => {
+      switch (count++) {
+        case 0:
+          ok(e.data.endsWith("file_bug1375833-frame2.html"), "check location");
+
+          webNav = SpecialPowers.wrap(testWin)
+                                .docShell
+                                .QueryInterface(SpecialPowers.Ci.nsIWebNavigation);
+          shistory = webNav.sessionHistory;
+          is(shistory.count, 2, "check history length");
+          is(shistory.index, 1, "check history index");
+
+          frameDocShellId = String(getFrameDocShell().historyID);
+          ok(frameDocShellId, "sanity check for docshell ID");
+
+          testWin.location.reload();
+          break;
+        case 1:
+          ok(e.data.endsWith("file_bug1375833-frame2.html"), "check location");
+          is(shistory.count, 4, "check history length");
+          is(shistory.index, 3, "check history index");
+
+          let newFrameDocShellId = String(getFrameDocShell().historyID);
+          ok(newFrameDocShellId, "sanity check for docshell ID");
+          is(newFrameDocShellId, frameDocShellId, "check docshell ID remains after reload");
+
+          if (!SpecialPowers.Services.appinfo.sessionHistoryInParent) {
+            let entry = shistory.legacySHistory.getEntryAtIndex(shistory.index);
+            let frameEntry = entry.GetChildAt(0);
+            is(String(frameEntry.docshellID), frameDocShellId, "check newly added shentry uses the same docshell ID");
+          } else {
+            let p = chromeScript.promiseOneMessage("test1");
+            chromeScript.sendAsyncMessage("test1", SpecialPowers.wrap(testWin).browsingContext.id);
+            let result = await p;
+            ok(result.success, "legacySHistory worked around ok");
+            is(result.value, frameDocShellId, "check newly added shentry uses the same docshell ID");
+          }
+
+          webNav.goBack();
+          break;
+        case 2:
+          ok(e.data.endsWith("file_bug1375833-frame1.html"), "check location");
+          is(shistory.count, 4, "check history length");
+          is(shistory.index, 2, "check history index");
+
+          webNav.goBack();
+          break;
+        case 3:
+          ok(e.data.endsWith("file_bug1375833-frame2.html"), "check location");
+          is(shistory.count, 4, "check history length");
+          is(shistory.index, 1, "check history index");
+
+          webNav.goBack();
+          break;
+        case 4:
+          ok(e.data.endsWith("file_bug1375833-frame1.html"), "check location");
+          is(shistory.count, 4, "check history length");
+          is(shistory.index, 0, "check history index");
+
+          if (chromeScript) {
+            chromeScript.destroy();
+          }
+          testWin.close();
+          SimpleTest.finish();
+      }
+    });
+
+    function getFrameDocShell() {
+      return SpecialPowers.wrap(testWin.window[0]).docShell;
+    }
+
+  </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1375833">Mozilla Bug 1375833</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>