1 files changed, 55 insertions, 0 deletions
diff --git a/browser/base/content/test/general/browser_viewSourceInTabOnViewSource.js b/browser/base/content/test/general/browser_viewSourceInTabOnViewSource.js
new file mode 100644
index 000000000..c8f3cdc96
--- /dev/null
+++ b/browser/base/content/test/general/browser_viewSourceInTabOnViewSource.js
@@ -0,0 +1,55 @@
+function wait_while_tab_is_busy() {
+  return new Promise(resolve => {
+    let progressListener = {
+      onStateChange: function(aWebProgress, aRequest, aStateFlags, aStatus) {
+        if (aStateFlags & Ci.nsIWebProgressListener.STATE_STOP) {
+          gBrowser.removeProgressListener(this);
+          setTimeout(resolve, 0);
+        }
+      }
+    };
+    gBrowser.addProgressListener(progressListener);
+  });
+}
+
+// This function waits for the tab to stop being busy instead of waiting for it
+// to load, since the canViewSource change happens at that time.
+var with_new_tab_opened = Task.async(function* (options, taskFn) {
+  let busyPromise = wait_while_tab_is_busy();
+  let tab = yield BrowserTestUtils.openNewForegroundTab(options.gBrowser, options.url, false);
+  yield busyPromise;
+  yield taskFn(tab.linkedBrowser);
+  gBrowser.removeTab(tab);
+});
+
+add_task(function*() {
+  yield new Promise((resolve) => {
+    SpecialPowers.pushPrefEnv({"set": [
+                                ["view_source.tab", true],
+                              ]}, resolve);
+  });
+});
+
+add_task(function* test_regular_page() {
+  function* test_expect_view_source_enabled(browser) {
+    ok(!XULBrowserWindow.canViewSource.hasAttribute("disabled"),
+       "View Source should be enabled");
+  }
+
+  yield with_new_tab_opened({
+    gBrowser,
+    url: "http://example.com",
+  }, test_expect_view_source_enabled);
+});
+
+add_task(function* test_view_source_page() {
+  function* test_expect_view_source_disabled(browser) {
+    ok(XULBrowserWindow.canViewSource.hasAttribute("disabled"),
+       "View Source should be disabled");
+  }
+
+  yield with_new_tab_opened({
+    gBrowser,
+    url: "view-source:http://example.com",
+  }, test_expect_view_source_disabled);
+});