4 files changed, 251 insertions, 0 deletions
diff --git a/startupcache/test/TestStartupCache.cpp b/startupcache/test/TestStartupCache.cpp
new file mode 100644
index 0000000000..9c817ff725
--- /dev/null
+++ b/startupcache/test/TestStartupCache.cpp
@@ -0,0 +1,188 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gtest/gtest.h"
+
+#include "mozilla/scache/StartupCache.h"
+#include "mozilla/scache/StartupCacheUtils.h"
+
+#include "nsDirectoryServiceDefs.h"
+#include "nsIOutputStream.h"
+#include "nsISupports.h"
+#include "nsIStorageStream.h"
+#include "nsIObjectInputStream.h"
+#include "nsIObjectOutputStream.h"
+#include "nsIURI.h"
+#include "nsThreadUtils.h"
+#include "prenv.h"
+#include "prio.h"
+#include "prprf.h"
+#include "mozilla/gtest/MozAssertions.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/Printf.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/UniquePtrExtensions.h"
+#include "nsNetCID.h"
+#include "nsIURIMutator.h"
+
+using namespace JS;
+
+using namespace mozilla::scache;
+using mozilla::UniquePtr;
+
+void WaitForStartupTimer() {
+  StartupCache* sc = StartupCache::GetSingleton();
+  PR_Sleep(3 * PR_TicksPerSecond());
+
+  while (true) {
+    NS_ProcessPendingEvents(nullptr);
+    if (sc->StartupWriteComplete()) {
+      return;
+    }
+    PR_Sleep(1 * PR_TicksPerSecond());
+  }
+}
+
+class TestStartupCache : public ::testing::Test {
+ protected:
+  TestStartupCache();
+  ~TestStartupCache();
+
+  nsCOMPtr<nsIFile> mSCFile;
+};
+
+TestStartupCache::TestStartupCache() {
+  NS_GetSpecialDirectory(NS_OS_TEMP_DIR, getter_AddRefs(mSCFile));
+  mSCFile->AppendNative("test-startupcache.tmp"_ns);
+#ifdef XP_WIN
+  nsAutoString env(u"MOZ_STARTUP_CACHE="_ns);
+  env.Append(mSCFile->NativePath());
+  _wputenv(env.get());
+#else
+  nsAutoCString path;
+  mSCFile->GetNativePath(path);
+  char* env = mozilla::Smprintf("MOZ_STARTUP_CACHE=%s", path.get()).release();
+  PR_SetEnv(env);
+  // We intentionally leak `env` here because it is required by PR_SetEnv
+  MOZ_LSAN_INTENTIONALLY_LEAK_OBJECT(env);
+#endif
+  StartupCache::GetSingleton()->InvalidateCache();
+}
+TestStartupCache::~TestStartupCache() {
+  PR_SetEnv("MOZ_STARTUP_CACHE=");
+  StartupCache::GetSingleton()->InvalidateCache();
+}
+
+TEST_F(TestStartupCache, StartupWriteRead) {
+  nsresult rv;
+  StartupCache* sc = StartupCache::GetSingleton();
+
+  const char* buf = "Market opportunities for BeardBook";
+  const char* id = "id";
+  const char* outbuf;
+  uint32_t len;
+
+  rv = sc->PutBuffer(id, mozilla::UniqueFreePtr<char[]>(strdup(buf)),
+                     strlen(buf) + 1);
+  EXPECT_NS_SUCCEEDED(rv);
+
+  rv = sc->GetBuffer(id, &outbuf, &len);
+  EXPECT_NS_SUCCEEDED(rv);
+  EXPECT_STREQ(buf, outbuf);
+
+  rv = sc->ResetStartupWriteTimerAndLock();
+  EXPECT_NS_SUCCEEDED(rv);
+  WaitForStartupTimer();
+
+  rv = sc->GetBuffer(id, &outbuf, &len);
+  EXPECT_NS_SUCCEEDED(rv);
+  EXPECT_STREQ(buf, outbuf);
+}
+
+TEST_F(TestStartupCache, WriteInvalidateRead) {
+  nsresult rv;
+  const char* buf = "BeardBook competitive analysis";
+  const char* id = "id";
+  const char* outbuf;
+  uint32_t len;
+  StartupCache* sc = StartupCache::GetSingleton();
+  ASSERT_TRUE(sc);
+
+  rv = sc->PutBuffer(id, mozilla::UniqueFreePtr<char[]>(strdup(buf)),
+                     strlen(buf) + 1);
+  EXPECT_NS_SUCCEEDED(rv);
+
+  sc->InvalidateCache();
+
+  rv = sc->GetBuffer(id, &outbuf, &len);
+  EXPECT_EQ(rv, NS_ERROR_NOT_AVAILABLE);
+}
+
+TEST_F(TestStartupCache, WriteObject) {
+  nsresult rv;
+
+  nsCOMPtr<nsIURI> obj;
+
+  constexpr auto spec = "http://www.mozilla.org"_ns;
+  rv = NS_MutateURI(NS_SIMPLEURIMUTATOR_CONTRACTID).SetSpec(spec).Finalize(obj);
+  EXPECT_NS_SUCCEEDED(rv);
+
+  StartupCache* sc = StartupCache::GetSingleton();
+
+  // Create an object stream. Usually this is done with
+  // NewObjectOutputWrappedStorageStream, but that uses
+  // StartupCache::GetSingleton in debug builds, and we
+  // don't have access to that here. Obviously.
+  const char* id = "id";
+  nsCOMPtr<nsIStorageStream> storageStream =
+      do_CreateInstance("@mozilla.org/storagestream;1");
+  ASSERT_TRUE(storageStream);
+
+  rv = storageStream->Init(256, (uint32_t)-1);
+  EXPECT_NS_SUCCEEDED(rv);
+
+  nsCOMPtr<nsIObjectOutputStream> objectOutput =
+      do_CreateInstance("@mozilla.org/binaryoutputstream;1");
+  ASSERT_TRUE(objectOutput);
+
+  nsCOMPtr<nsIOutputStream> outputStream = do_QueryInterface(storageStream);
+
+  rv = objectOutput->SetOutputStream(outputStream);
+  EXPECT_NS_SUCCEEDED(rv);
+
+  nsCOMPtr<nsISupports> objQI(do_QueryInterface(obj));
+  rv = objectOutput->WriteObject(objQI, true);
+  EXPECT_NS_SUCCEEDED(rv);
+
+  mozilla::UniqueFreePtr<char[]> buf;
+  uint32_t len;
+  NewBufferFromStorageStream(storageStream, &buf, &len);
+
+  // Since this is a post-startup write, it should be written and
+  // available.
+  rv = sc->PutBuffer(id, std::move(buf), len);
+  EXPECT_NS_SUCCEEDED(rv);
+
+  const char* buf2;
+  uint32_t len2;
+  nsCOMPtr<nsIObjectInputStream> objectInput;
+  rv = sc->GetBuffer(id, &buf2, &len2);
+  EXPECT_NS_SUCCEEDED(rv);
+
+  rv = NewObjectInputStreamFromBuffer(buf2, len2, getter_AddRefs(objectInput));
+  EXPECT_NS_SUCCEEDED(rv);
+
+  nsCOMPtr<nsISupports> deserialized;
+  rv = objectInput->ReadObject(true, getter_AddRefs(deserialized));
+  EXPECT_NS_SUCCEEDED(rv);
+
+  nsCOMPtr<nsIURI> uri(do_QueryInterface(deserialized));
+  ASSERT_TRUE(uri);
+
+  nsCString outSpec;
+  rv = uri->GetSpec(outSpec);
+  EXPECT_NS_SUCCEEDED(rv);
+  ASSERT_TRUE(outSpec.Equals(spec));
+}
diff --git a/startupcache/test/browser/browser.toml b/startupcache/test/browser/browser.toml
new file mode 100644
index 0000000000..3de76f21ed
--- /dev/null
+++ b/startupcache/test/browser/browser.toml
@@ -0,0 +1,3 @@
+[DEFAULT]
+
+["browser_startupcache_telemetry.js"]
diff --git a/startupcache/test/browser/browser_startupcache_telemetry.js b/startupcache/test/browser/browser_startupcache_telemetry.js
new file mode 100644
index 0000000000..e4c8085bed
--- /dev/null
+++ b/startupcache/test/browser/browser_startupcache_telemetry.js
@@ -0,0 +1,50 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const LABELS_STARTUP_CACHE_REQUESTS = {
+  HitMemory: 0,
+  HitDisk: 1,
+  Miss: 2,
+};
+
+add_task(async function () {
+  // Turn off tab preloading to avoid issues with RemoteController.js
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.newtab.preload", false]],
+  });
+
+  Services.obs.notifyObservers(null, "startupcache-invalidate");
+  Services.telemetry.getSnapshotForHistograms("main", true);
+  let newWin = await BrowserTestUtils.openNewBrowserWindow();
+  let snapshot = Services.telemetry.getSnapshotForHistograms("main", true);
+  function histValue(label) {
+    return snapshot.parent.STARTUP_CACHE_REQUESTS.values[label] || 0;
+  }
+  Assert.equal(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitMemory), 0);
+  Assert.equal(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitDisk), 0);
+  Assert.notEqual(histValue(LABELS_STARTUP_CACHE_REQUESTS.Miss), 0);
+  await BrowserTestUtils.closeWindow(newWin);
+
+  newWin = await BrowserTestUtils.openNewBrowserWindow();
+  snapshot = Services.telemetry.getSnapshotForHistograms("main", true);
+  Assert.notEqual(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitMemory), 0);
+  Assert.equal(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitDisk), 0);
+
+  // Here and below, 50 is just a nice round number that should be well over
+  // what we should observe under normal circumstances, and well under what
+  // we should see if something is seriously wrong. It won't catch everything,
+  // but it's better than nothing, and better than a test that cries wolf.
+  Assert.less(histValue(LABELS_STARTUP_CACHE_REQUESTS.Miss), 50);
+  await BrowserTestUtils.closeWindow(newWin);
+
+  Services.obs.notifyObservers(null, "startupcache-invalidate", "memoryOnly");
+  newWin = await BrowserTestUtils.openNewBrowserWindow();
+  snapshot = Services.telemetry.getSnapshotForHistograms("main", true);
+  Assert.less(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitMemory), 50);
+  Assert.notEqual(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitDisk), 0);
+  // Some misses can come through - just ensure it's a small number
+  Assert.less(histValue(LABELS_STARTUP_CACHE_REQUESTS.Miss), 50);
+  await BrowserTestUtils.closeWindow(newWin);
+});
diff --git a/startupcache/test/moz.build b/startupcache/test/moz.build
new file mode 100644
index 0000000000..0197659309
--- /dev/null
+++ b/startupcache/test/moz.build
@@ -0,0 +1,10 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+UNIFIED_SOURCES += [
+    "TestStartupCache.cpp",
+]
+FINAL_LIBRARY = "xul-gtest"