UMA: How often are different network error screens encountered during OOBE

chrome/browser/chromeos/login/error_screens_histogram_helper_unittest.cc

+// Copyright 2014 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 "chrome/browser/chromeos/login/error_screens_histogram_helper.h"
+
+#include "base/metrics/statistics_recorder.h"
+#include "chrome/test/base/uma_histogram_helper.h"
+#include "content/public/test/test_browser_thread_bundle.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace chromeos {
+
+namespace {
+
+const char* const kHistogramsToSnapshot[] = {
+    "OOBE.NetworkErrorShown.TestScreen",
+    "OOBE.ErrorScreensTime.TestScreen.Portal"};
+}
+
+class ErrorScreensHistogramHelperTest : public testing::Test {
+ public:
+  virtual void SetUp() OVERRIDE {
+    {
+      // For histograms creation
+      ErrorScreensHistogramHelper thelp("TestScreen");
+      thelp.OnScreenShow();
+      thelp.OnErrorShow(ErrorScreen::ERROR_STATE_PORTAL);
+    }
+    histograms_.PrepareSnapshot(kHistogramsToSnapshot,
+                                arraysize(kHistogramsToSnapshot));
+    histograms_.Fetch();
+    helper_.reset(new ErrorScreensHistogramHelper("TestScreen"));
+  }

[ygorshenin1, 2014/08/26 14:33:14]

nit: could you please add a blank line after the closing curly brace?

[Roman Sorokin (ftl), 2014/09/04 13:26:47]

Done.

+  content::TestBrowserThreadBundle thread_bundle_;
+  UMAHistogramHelper histograms_;
+  scoped_ptr<ErrorScreensHistogramHelper> helper_;
+};
+
+// No errors when screen was not shown.
+TEST_F(ErrorScreensHistogramHelperTest, DoesNotShowScreen) {
+  helper_.reset();
+  histograms_.ExpectTotalCount("OOBE.NetworkErrorShown.TestScreen", 0);
+}
+
+// No errors when screen was shown and error was not.
+TEST_F(ErrorScreensHistogramHelperTest, ShowScreenWithoutError) {
+  helper_->OnScreenShow();
+  helper_.reset();
+  histograms_.ExpectUniqueSample(
+      "OOBE.NetworkErrorShown.TestScreen", ErrorScreen::ERROR_STATE_NONE, 1);
+}
+
+// Show 3 offline errors and 1 portal error. Make sure in time histograms logged
+// portal error only.
+TEST_F(ErrorScreensHistogramHelperTest, ShowScreenAndError) {
+  helper_->OnScreenShow();
+  helper_->OnErrorShow(ErrorScreen::ERROR_STATE_OFFLINE);
+  helper_->OnErrorShow(ErrorScreen::ERROR_STATE_OFFLINE);
+  helper_->OnErrorHide();
+  helper_->OnErrorShow(ErrorScreen::ERROR_STATE_OFFLINE);
+  histograms_.ExpectUniqueSample(
+      "OOBE.NetworkErrorShown.TestScreen", ErrorScreen::ERROR_STATE_OFFLINE, 3);
+  helper_->OnErrorShow(ErrorScreen::ERROR_STATE_PORTAL);
+  histograms_.ExpectBucketCount(
+      "OOBE.NetworkErrorShown.TestScreen", ErrorScreen::ERROR_STATE_PORTAL, 1);
+  histograms_.ExpectTotalCount("OOBE.ErrorScreensTime.TestScreen.Portal", 0);
+  helper_.reset();
+  histograms_.ExpectTotalCount("OOBE.ErrorScreensTime.TestScreen.Portal", 1);
+}
+
+// Show error and hide it after 1 sec.
+TEST_F(ErrorScreensHistogramHelperTest, TestShowHideTime) {
+  helper_->OnScreenShow();
+  base::Time now = base::Time::Now();
+  helper_->OnErrorShowTime(ErrorScreen::ERROR_STATE_PORTAL, now);
+  now += base::TimeDelta::FromMilliseconds(1000);
+  helper_->OnErrorHideTime(now);
+  helper_.reset();
+  histograms_.ExpectUniqueSample(
+      "OOBE.ErrorScreensTime.TestScreen.Portal", 1000, 1);
+}
+
+// Show, hide, show, hide error with 1 sec interval. Make sure time logged in
+// histogram is 2 sec.
+TEST_F(ErrorScreensHistogramHelperTest, TestShowHideShowHideTime) {
+  helper_->OnScreenShow();
+  base::Time now = base::Time::Now();
+  helper_->OnErrorShowTime(ErrorScreen::ERROR_STATE_PROXY, now);
+  now += base::TimeDelta::FromMilliseconds(1000);
+  helper_->OnErrorHideTime(now);
+  now += base::TimeDelta::FromMilliseconds(1000);
+  helper_->OnErrorShowTime(ErrorScreen::ERROR_STATE_PORTAL, now);
+  now += base::TimeDelta::FromMilliseconds(1000);
+  helper_->OnErrorHideTime(now);
+  helper_.reset();
+  histograms_.ExpectUniqueSample(
+      "OOBE.ErrorScreensTime.TestScreen.Portal", 2000, 1);
+}
+
+// Show, show, hide error with 1 sec interval. Make sure time logged in
+// histogram is 2 sec.
+TEST_F(ErrorScreensHistogramHelperTest, TestShowShowHideTime) {
+  helper_->OnScreenShow();
+  base::Time now = base::Time::Now();
+  helper_->OnErrorShowTime(ErrorScreen::ERROR_STATE_PROXY, now);
+  now += base::TimeDelta::FromMilliseconds(1000);
+  helper_->OnErrorShowTime(ErrorScreen::ERROR_STATE_PORTAL, now);
+  now += base::TimeDelta::FromMilliseconds(1000);
+  helper_->OnErrorHideTime(now);
+  helper_.reset();
+  histograms_.ExpectUniqueSample(
+      "OOBE.ErrorScreensTime.TestScreen.Portal", 2000, 1);
+}
+
+}  // namespace chromeos