Extract guts of ChromeStabilityMetricsProvider into helper class

components/metrics/stability_metrics_helper_unittest.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/metrics/stability_metrics_helper.h"
+
+#include "base/basictypes.h"
+#include "base/prefs/pref_service.h"
+#include "base/prefs/scoped_user_pref_update.h"
+#include "base/prefs/testing_pref_service.h"
+#include "components/metrics/proto/system_profile.pb.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace metrics {
+
+namespace {
+
+class StabilityMetricsHelperTest : public testing::Test {
+ protected:
+  StabilityMetricsHelperTest() : prefs_(new TestingPrefServiceSimple) {
+    StabilityMetricsHelper::RegisterPrefs(prefs()->registry());
+  }
+
+  TestingPrefServiceSimple* prefs() { return prefs_.get(); }
+
+ private:
+  scoped_ptr<TestingPrefServiceSimple> prefs_;
+
+  DISALLOW_COPY_AND_ASSIGN(StabilityMetricsHelperTest);
+};
+
+}  // namespace
+
+TEST_F(StabilityMetricsHelperTest, BrowserChildProcessCrashed) {
+  StabilityMetricsHelper helper(prefs());
+
+  helper.BrowserChildProcessCrashed();
+  helper.BrowserChildProcessCrashed();
+
+  // Call ProvideStabilityMetrics to check that it will force pending tasks to
+  // be executed immediately.
+  metrics::SystemProfileProto system_profile;
+
+  helper.ProvideStabilityMetrics(&system_profile);
+
+  // Check current number of instances created.
+  const metrics::SystemProfileProto_Stability& stability =
+      system_profile.stability();
+
+  EXPECT_EQ(2, stability.child_process_crash_count());
+}
+
+TEST_F(StabilityMetricsHelperTest, LogRendererCrash) {
+  StabilityMetricsHelper helper(prefs());
+
+  // Crash and abnormal termination should increment renderer crash count.
+  helper.LogRendererCrash(false, base::TERMINATION_STATUS_PROCESS_CRASHED, 1);
+
+  helper.LogRendererCrash(false, base::TERMINATION_STATUS_ABNORMAL_TERMINATION,
+                          1);
+
+  // Kill does not increment renderer crash count.
+  helper.LogRendererCrash(false, base::TERMINATION_STATUS_PROCESS_WAS_KILLED,
+                          1);
+
+  // Failed launch increments failed launch count.
+  helper.LogRendererCrash(false, base::TERMINATION_STATUS_LAUNCH_FAILED, 1);
+
+  metrics::SystemProfileProto system_profile;
+
+  // Call ProvideStabilityMetrics to check that it will force pending tasks to
+  // be executed immediately.
+  helper.ProvideStabilityMetrics(&system_profile);
+
+  EXPECT_EQ(2, system_profile.stability().renderer_crash_count());
+  EXPECT_EQ(1, system_profile.stability().renderer_failed_launch_count());
+  EXPECT_EQ(0, system_profile.stability().extension_renderer_crash_count());
+
+  helper.ClearSavedStabilityMetrics();
+
+  // Crash and abnormal termination should increment extension crash count.
+  helper.LogRendererCrash(true, base::TERMINATION_STATUS_PROCESS_CRASHED, 1);
+
+  // Failed launch increments extension failed launch count.
+  helper.LogRendererCrash(true, base::TERMINATION_STATUS_LAUNCH_FAILED, 1);
+
+  system_profile.Clear();
+  helper.ProvideStabilityMetrics(&system_profile);
+
+  EXPECT_EQ(0, system_profile.stability().renderer_crash_count());
+  EXPECT_EQ(1, system_profile.stability().extension_renderer_crash_count());
+  EXPECT_EQ(
+      1, system_profile.stability().extension_renderer_failed_launch_count());
+}
+
+}  // namespace metrics