Restoring the chrome variatioons client, with a fix for browser_test failures caused by it.

chrome/browser/metrics/variations_service_unittest.cc

Index: chrome/browser/metrics/variations_service_unittest.cc
diff --git a/chrome/browser/metrics/variations_service_unittest.cc b/chrome/browser/metrics/variations_service_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..67f2c19f1c51f2272522232dd29684761610bba1
--- /dev/null
+++ b/chrome/browser/metrics/variations_service_unittest.cc
@@ -0,0 +1,210 @@
+// Copyright (c) 2012 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/metrics/proto/study.pb.h"
+#include "chrome/browser/metrics/variations_service.h"
+#include "chrome/common/chrome_version_info.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+// Converts |time| to chrome_variations::Study proto format.
+int64 TimeToProtoTime(const base::Time& time) {
+  return (time - base::Time::UnixEpoch()).InSeconds();
+}
+
+}  // namespace
+
+TEST(VariationsServiceTest, CheckStudyChannel) {
+  const chrome::VersionInfo::Channel channels[] = {
+    chrome::VersionInfo::CHANNEL_CANARY,
+    chrome::VersionInfo::CHANNEL_DEV,
+    chrome::VersionInfo::CHANNEL_BETA,
+    chrome::VersionInfo::CHANNEL_STABLE,
+  };
+  const chrome_variations::Study_Channel study_channels[] = {
+    chrome_variations::Study_Channel_CANARY,
+    chrome_variations::Study_Channel_DEV,
+    chrome_variations::Study_Channel_BETA,
+    chrome_variations::Study_Channel_STABLE,
+  };
+  ASSERT_EQ(arraysize(channels), arraysize(study_channels));
+  bool channel_added[arraysize(channels)] = { 0 };
+
+  chrome_variations::Study study;
+
+  // Check in the forwarded order. The loop cond is <= arraysize(study_channels)
+  // instead of < so that the result of adding the last channel gets checked.
+  for (size_t i = 0; i <= arraysize(study_channels); ++i) {
+    for (size_t j = 0; j < arraysize(channels); ++j) {
+      const bool expected = channel_added[j] || study.channel_size() == 0;
+      const bool result = VariationsService::CheckStudyChannel(study,
+                                                               channels[j]);
+      EXPECT_EQ(expected, result) << "Case " << i << "," << j << " failed!";
+    }
+
+    if (i < arraysize(study_channels))
+    {
+      study.add_channel(study_channels[i]);
+      channel_added[i] = true;
+    }
+  }
+
+  // Do the same check in the reverse order.
+  study.clear_channel();
+  memset(&channel_added, 0, sizeof(channel_added));
+  for (size_t i = 0; i <= arraysize(study_channels); ++i) {
+    for (size_t j = 0; j < arraysize(channels); ++j) {
+      const bool expected = channel_added[j] || study.channel_size() == 0;
+      const bool result = VariationsService::CheckStudyChannel(study,
+                                                               channels[j]);
+      EXPECT_EQ(expected, result) << "Case " << i << "," << j << " failed!";
+    }
+
+    if (i < arraysize(study_channels))
+    {
+      const int index = arraysize(study_channels) - i - 1;
+      study.add_channel(study_channels[index]);
+      channel_added[index] = true;
+    }
+  }
+}
+
+TEST(VariationsServiceTest, CheckStudyVersion) {
+  const struct {
+    const char* min_version;
+    const char* version;
+    bool expected_result;
+  } min_test_cases[] = {
+    { "1.2.2", "1.2.3", true },
+    { "1.2.3", "1.2.3", true },
+    { "1.2.4", "1.2.3", false },
+    { "1.3.2", "1.2.3", false },
+    { "2.1.2", "1.2.3", false },
+    { "0.3.4", "1.2.3", true },
+  };
+
+  const struct {
+    const char* max_version;
+    const char* version;
+    bool expected_result;
+  } max_test_cases[] = {
+    { "1.2.2", "1.2.3", false },
+    { "1.2.3", "1.2.3", true },
+    { "1.2.4", "1.2.3", true },
+    { "2.1.1", "1.2.3", true },
+    { "2.1.1", "2.3.4", false },
+  };
+
+  chrome_variations::Study study;
+
+  // Min/max version not set should result in true.
+  EXPECT_TRUE(VariationsService::CheckStudyVersion(study, "1.2.3"));
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(min_test_cases); ++i) {
+    study.set_min_version(min_test_cases[i].min_version);
+    const bool result =
+        VariationsService::CheckStudyVersion(study, min_test_cases[i].version);
+    EXPECT_EQ(min_test_cases[i].expected_result, result) <<
+        "Case " << i << " failed!";
+  }
+  study.clear_min_version();
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(max_test_cases); ++i) {
+    study.set_max_version(max_test_cases[i].max_version);
+    const bool result =
+        VariationsService::CheckStudyVersion(study, max_test_cases[i].version);
+    EXPECT_EQ(max_test_cases[i].expected_result, result) <<
+        "Case " << i << " failed!";
+  }
+
+  // Check intersection semantics.
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(min_test_cases); ++i) {
+    for (size_t j = 0; j < ARRAYSIZE_UNSAFE(max_test_cases); ++j) {
+      study.set_min_version(min_test_cases[i].min_version);
+      study.set_max_version(max_test_cases[j].max_version);
+
+      if (!min_test_cases[i].expected_result) {
+        const bool result =
+            VariationsService::CheckStudyVersion(study,
+                                                 min_test_cases[i].version);
+        EXPECT_FALSE(result) << "Case " << i << "," << j << " failed!";
+      }
+
+      if (!max_test_cases[j].expected_result) {
+        const bool result =
+            VariationsService::CheckStudyVersion(study,
+                                                 max_test_cases[j].version);
+        EXPECT_FALSE(result) << "Case " << i << "," << j << " failed!";
+      }
+    }
+  }
+}
+
+// The current client logic does not handle version number strings containing
+// wildcards. Check that any such values received from the server result in the
+// study being disqualified.
+TEST(VariationsServiceTest, CheckStudyVersionWildcards) {
+  chrome_variations::Study study;
+
+  study.set_min_version("1.0.*");
+  EXPECT_FALSE(VariationsService::CheckStudyVersion(study, "1.2.3"));
+
+  study.clear_min_version();
+  study.set_max_version("2.0.*");
+  EXPECT_FALSE(VariationsService::CheckStudyVersion(study, "1.2.3"));
+}
+
+TEST(VariationsServiceTest, CheckStudyDate) {
+  const base::Time now = base::Time::Now();
+  const base::TimeDelta delta = base::TimeDelta::FromHours(1);
+  const struct {
+    const base::Time start_date;
+    bool expected_result;
+  } start_test_cases[] = {
+    { now - delta, true },
+    { now, true },
+    { now + delta, false },
+  };
+  const struct {
+    const base::Time expiry_date;
+    bool expected_result;
+  } expiry_test_cases[] = {
+    { now - delta, false },
+    { now, false },
+    { now + delta, true },
+  };
+
+  chrome_variations::Study study;
+
+  // Start/expiry date not set should result in true.
+  EXPECT_TRUE(VariationsService::CheckStudyDate(study, now));
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(start_test_cases); ++i) {
+    study.set_start_date(TimeToProtoTime(start_test_cases[i].start_date));
+    const bool result = VariationsService::CheckStudyDate(study, now);
+    EXPECT_EQ(start_test_cases[i].expected_result, result)
+        << "Case " << i << " failed!";
+  }
+  study.clear_start_date();
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(expiry_test_cases); ++i) {
+    study.set_expiry_date(TimeToProtoTime(expiry_test_cases[i].expiry_date));
+    const bool result = VariationsService::CheckStudyDate(study, now);
+    EXPECT_EQ(expiry_test_cases[i].expected_result, result)
+        << "Case " << i << " failed!";
+  }
+
+  // Check intersection semantics.
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(start_test_cases); ++i) {
+    for (size_t j = 0; j < ARRAYSIZE_UNSAFE(expiry_test_cases); ++j) {
+      study.set_start_date(TimeToProtoTime(start_test_cases[i].start_date));
+      study.set_expiry_date(TimeToProtoTime(expiry_test_cases[j].expiry_date));
+      const bool expected = start_test_cases[i].expected_result &&
+                            expiry_test_cases[j].expected_result;
+      const bool result = VariationsService::CheckStudyDate(study, now);
+      EXPECT_EQ(expected, result) << "Case " << i << "," << j << " failed!";
+    }
+  }
+}