1 files changed, 30 insertions, 0 deletions
diff --git a/browser/components/newtab/test/browser/abouthomecache/browser_locale_change.js b/browser/components/newtab/test/browser/abouthomecache/browser_locale_change.js
new file mode 100644
index 0000000000..e9e3c619ec
--- /dev/null
+++ b/browser/components/newtab/test/browser/abouthomecache/browser_locale_change.js
@@ -0,0 +1,30 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Tests that the about:home startup cache is cleared if the app
+ * locale changes.
+ */
+add_task(async function test_locale_change() {
+  await withFullyLoadedAboutHome(async browser => {
+    await simulateRestart(browser);
+    await ensureCachedAboutHome(browser);
+
+    Services.obs.notifyObservers(null, "intl:app-locales-changed");
+    await AboutHomeStartupCache.ensureCacheEntry();
+
+    // We're testing that switching locales blows away the cache, so we
+    // bypass the automatic writing of the cache on shutdown, and we
+    // also don't need to wait for the cache to be available.
+    await simulateRestart(browser, {
+      withAutoShutdownWrite: false,
+      ensureCacheWinsRace: false,
+    });
+    await ensureDynamicAboutHome(
+      browser,
+      AboutHomeStartupCache.CACHE_RESULT_SCALARS.DOES_NOT_EXIST
+    );
+  });
+});