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+<!DOCTYPE html>
+<html lang="en">
+ <head>
+ <meta http-equiv="content-type" content="text/html; charset=utf-8">
+ <title>Bug 1300461</title>
+ </head>
+ <body onload="test();">
+ <script>
+ /**
+ * Bug 1300461 identifies that if a history entry was not bfcached, and
+ * a http redirection happens when navigating to that entry, the history
+ * index would mess up.
+ *
+ * The test case emulates the circumstance by the following steps
+ * 1) Navigate to file_bug1300461_back.html which is not bf-cachable.
+ * 2) In file_bug1300461_back.html, replace its own history state to
+ * file_bug1300461_redirect.html.
+ * 3) Back, and then forward. Since the document is not in bfcache, it
+ * tries to load file_bug1300461_redirect.html directly.
+ * 4) file_bug1300461_redirect.html redirects UA to
+ * file_bug1300461_back.html through HTTP 301 header.
+ *
+ * We verify the history index, canGoBack, canGoForward, etc. keep correct
+ * in this process.
+ */
+ let Ci = SpecialPowers.Ci;
+ let webNav = SpecialPowers.wrap(window)
+ .docShell
+ .QueryInterface(Ci.nsIWebNavigation);
+ let shistory = webNav.sessionHistory;
+ let testSteps = [
+ function() {
+ opener.is(shistory.count, 1, "check history length");
+ opener.is(shistory.index, 0, "check history index");
+ opener.ok(!webNav.canGoForward, "check canGoForward");
+ setTimeout(() => window.location = "file_bug1300461_back.html", 0);
+ },
+ function() {
+ opener.is(shistory.count, 2, "check history length");
+ opener.is(shistory.index, 0, "check history index");
+ opener.ok(webNav.canGoForward, "check canGoForward");
+ window.history.forward();
+ },
+ function() {
+ opener.is(shistory.count, 2, "check history length");
+ opener.is(shistory.index, 0, "check history index");
+ opener.ok(webNav.canGoForward, "check canGoForward");
+ opener.info("file_bug1300461.html tests finished");
+ opener.finishTest();
+ },
+ ];
+
+ function test() {
+ if (opener) {
+ opener.info("file_bug1300461.html test " + opener.testCount);
+ testSteps[opener.testCount++]();
+ }
+ }
+ </script>
+ </body>
+</html>