1 files changed, 35 insertions, 0 deletions
diff --git a/browser/components/newtab/test/browser/abouthomecache/browser_bump_version.js b/browser/components/newtab/test/browser/abouthomecache/browser_bump_version.js
new file mode 100644
index 0000000000..726b9aa973
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+++ b/browser/components/newtab/test/browser/abouthomecache/browser_bump_version.js
@@ -0,0 +1,35 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Test that if the "version" metadata on the cache entry doesn't match
+ * the expectation that we ignore the cache and load the dynamic about:home
+ * document.
+ */
+add_task(async function test_bump_version() {
+  await withFullyLoadedAboutHome(async browser => {
+    // First, ensure that a pre-existing cache exists.
+    await simulateRestart(browser);
+
+    let cacheEntry = await AboutHomeStartupCache.ensureCacheEntry();
+    Assert.equal(
+      cacheEntry.getMetaDataElement("version"),
+      Services.appinfo.appBuildID,
+      "Cache entry should be versioned on the build ID"
+    );
+    cacheEntry.setMetaDataElement("version", "somethingnew");
+    // We don't need to shutdown write or ensure the cache wins the race,
+    // since we expect the cache to be blown away because the version number
+    // has been bumped.
+    await simulateRestart(browser, {
+      withAutoShutdownWrite: false,
+      ensureCacheWinsRace: false,
+    });
+    await ensureDynamicAboutHome(
+      browser,
+      AboutHomeStartupCache.CACHE_RESULT_SCALARS.INVALIDATED
+    );
+  });
+});