1 files changed, 32 insertions, 0 deletions
diff --git a/toolkit/components/reader/test/browser_readerMode_cached.js b/toolkit/components/reader/test/browser_readerMode_cached.js
new file mode 100644
index 0000000000..7f36a15dbb
--- /dev/null
+++ b/toolkit/components/reader/test/browser_readerMode_cached.js
@@ -0,0 +1,32 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+// This test verifies that the article is properly using the cached data
+// when switching into reader mode. The article produces a random number
+// contained within it, so if the article gets reloaded instead of using
+// the cached version, it would have a different value in it.
+const URL =
+  "http://mochi.test:8888/browser/toolkit/components/reader/test/readerModeRandom.sjs";
+
+add_task(async function () {
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, URL);
+
+  let randomNumber = await SpecialPowers.spawn(tab.linkedBrowser, [], () => {
+    return content.document.getElementById("rnd").textContent;
+  });
+
+  let promiseTabLoad = promiseTabLoadEvent(tab);
+  let readerButton = document.getElementById("reader-mode-button");
+  readerButton.click();
+  await promiseTabLoad;
+  await TestUtils.waitForCondition(() => !readerButton.hidden);
+
+  let newRandomNumber = await SpecialPowers.spawn(tab.linkedBrowser, [], () => {
+    return content.document.getElementById("rnd").textContent;
+  });
+
+  is(randomNumber, newRandomNumber, "used the same value");
+
+  BrowserTestUtils.removeTab(tab);
+});