Bug 1328829 Part 2: Check that related browser is not copied when switching remote type. r=gijs

browser/base/content/test/tabs/browser.ini

@@ -2,6 +2,7 @@
 support-files =
   dummy_page.html
 
+[browser_allow_process_switches_despite_related_browser.js]
 [browser_tabSpinnerProbe.js]
 skip-if = !e10s # Tab spinner is e10s only.
 [browser_tabSwitchPrintPreview.js]

browser/base/content/test/tabs/browser_allow_process_switches_despite_related_browser.js

@@ -0,0 +1,32 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
+
+const DUMMY_FILE = "dummy_page.html";
+
+// Test for bug 1328829.
+add_task(function* () {
+  let tab = yield BrowserTestUtils.openNewForegroundTab(gBrowser,
+                                                        "data:text/html,Hi");
+  registerCleanupFunction(function* () {
+    yield BrowserTestUtils.removeTab(tab);
+  });
+
+  let promiseTab =
+    BrowserTestUtils.waitForNewTab(gBrowser, "view-source:data:text/html,Hi");
+  BrowserViewSource(tab.linkedBrowser);
+  let viewSourceTab = yield promiseTab;
+  registerCleanupFunction(function* () {
+    yield BrowserTestUtils.removeTab(viewSourceTab);
+  });
+
+
+  let dummyPage = getChromeDir(getResolvedURI(gTestPath));
+  dummyPage.append(DUMMY_FILE);
+  const uriString = Services.io.newFileURI(dummyPage).spec;
+
+  let viewSourceBrowser = viewSourceTab.linkedBrowser;
+  viewSourceBrowser.loadURI(uriString);
+  let href = yield BrowserTestUtils.browserLoaded(viewSourceBrowser);
+  is(href, uriString,
+    "Check file:// URI loads in a browser that was previously for view-source");
+});