root/components/variations/variations_seed_processor_unittest.cc

DEFINITIONS

1. TimeToProtoTime
2. AddExperiment
3. CreateStudyWithFlagGroups
4. IsFieldTrialActive
5. CreateTrialFromStudy
6. TEST_F
7. TEST_F
8. TEST_F
9. TEST_F
10. TEST_F
11. TEST_F
12. TEST_F
13. TEST_F
14. TEST_F
15. TEST_F
16. TEST_F
17. TEST_F
18. TEST_F
19. TEST_F
20. TEST_F
21. TEST_F
22. TEST_F
23. TEST_F
24. TEST_F

// Copyright 2013 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/variations/variations_seed_processor.h"

#include <vector>

#include "base/command_line.h"
#include "base/strings/string_split.h"
#include "components/variations/processed_study.h"
#include "components/variations/variations_associated_data.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace chrome_variations {

namespace {

// Converts |time| to Study proto format.
int64 TimeToProtoTime(const base::Time& time) {
  return (time - base::Time::UnixEpoch()).InSeconds();
}

// Constants for testing associating command line flags with trial groups.
const char kFlagStudyName[] = "flag_test_trial";
const char kFlagGroup1Name[] = "flag_group1";
const char kFlagGroup2Name[] = "flag_group2";
const char kNonFlagGroupName[] = "non_flag_group";
const char kForcingFlag1[] = "flag_test1";
const char kForcingFlag2[] = "flag_test2";

const VariationID kExperimentId = 123;

// Adds an experiment to |study| with the specified |name| and |probability|.
Study_Experiment* AddExperiment(const std::string& name, int probability,
                                Study* study) {
  Study_Experiment* experiment = study->add_experiment();
  experiment->set_name(name);
  experiment->set_probability_weight(probability);
  return experiment;
}

// Populates |study| with test data used for testing associating command line
// flags with trials groups. The study will contain three groups, a default
// group that isn't associated with a flag, and two other groups, both
// associated with different flags.
Study CreateStudyWithFlagGroups(int default_group_probability,
                                int flag_group1_probability,
                                int flag_group2_probability) {
  DCHECK_GE(default_group_probability, 0);
  DCHECK_GE(flag_group1_probability, 0);
  DCHECK_GE(flag_group2_probability, 0);
  Study study;
  study.set_name(kFlagStudyName);
  study.set_default_experiment_name(kNonFlagGroupName);

  AddExperiment(kNonFlagGroupName, default_group_probability, &study);
  AddExperiment(kFlagGroup1Name, flag_group1_probability, &study)
      ->set_forcing_flag(kForcingFlag1);
  AddExperiment(kFlagGroup2Name, flag_group2_probability, &study)
      ->set_forcing_flag(kForcingFlag2);

  return study;
}

// Tests whether a field trial is active (i.e. group() has been called on it).
bool IsFieldTrialActive(const std::string& trial_name) {
  base::FieldTrial::ActiveGroups active_groups;
  base::FieldTrialList::GetActiveFieldTrialGroups(&active_groups);
  for (size_t i = 0; i < active_groups.size(); ++i) {
    if (active_groups[i].trial_name == trial_name)
      return true;
  }
  return false;
}

}  // namespace

class VariationsSeedProcessorTest : public ::testing::Test {
 public:
  VariationsSeedProcessorTest() {
  }

  virtual ~VariationsSeedProcessorTest() {
    // Ensure that the maps are cleared between tests, since they are stored as
    // process singletons.
    testing::ClearAllVariationIDs();
    testing::ClearAllVariationParams();
  }

  bool CreateTrialFromStudy(const Study* study) {
    ProcessedStudy processed_study;
    if (processed_study.Init(study, false)) {
      VariationsSeedProcessor().CreateTrialFromStudy(processed_study);
      return true;
    }
    return false;
  }

 private:
  DISALLOW_COPY_AND_ASSIGN(VariationsSeedProcessorTest);
};

TEST_F(VariationsSeedProcessorTest, AllowForceGroupAndVariationId) {
  CommandLine::ForCurrentProcess()->AppendSwitch(kForcingFlag1);

  base::FieldTrialList field_trial_list(NULL);

  Study study = CreateStudyWithFlagGroups(100, 0, 0);
  study.mutable_experiment(1)->set_google_web_experiment_id(kExperimentId);

  EXPECT_TRUE(CreateTrialFromStudy(&study));
  EXPECT_EQ(kFlagGroup1Name,
            base::FieldTrialList::FindFullName(kFlagStudyName));

  VariationID id = GetGoogleVariationID(GOOGLE_WEB_PROPERTIES, kFlagStudyName,
                                        kFlagGroup1Name);
  EXPECT_EQ(kExperimentId, id);
}

TEST_F(VariationsSeedProcessorTest, CheckStudyChannel) {
  VariationsSeedProcessor seed_processor;

  const Study_Channel channels[] = {
    Study_Channel_CANARY,
    Study_Channel_DEV,
    Study_Channel_BETA,
    Study_Channel_STABLE,
  };
  bool channel_added[arraysize(channels)] = { 0 };

  Study_Filter filter;

  // Check in the forwarded order. The loop cond is <= arraysize(channels)
  // instead of < so that the result of adding the last channel gets checked.
  for (size_t i = 0; i <= arraysize(channels); ++i) {
    for (size_t j = 0; j < arraysize(channels); ++j) {
      const bool expected = channel_added[j] || filter.channel_size() == 0;
      const bool result = seed_processor.CheckStudyChannel(filter, channels[j]);
      EXPECT_EQ(expected, result) << "Case " << i << "," << j << " failed!";
    }

    if (i < arraysize(channels)) {
      filter.add_channel(channels[i]);
      channel_added[i] = true;
    }
  }

  // Do the same check in the reverse order.
  filter.clear_channel();
  memset(&channel_added, 0, sizeof(channel_added));
  for (size_t i = 0; i <= arraysize(channels); ++i) {
    for (size_t j = 0; j < arraysize(channels); ++j) {
      const bool expected = channel_added[j] || filter.channel_size() == 0;
      const bool result = seed_processor.CheckStudyChannel(filter, channels[j]);
      EXPECT_EQ(expected, result) << "Case " << i << "," << j << " failed!";
    }

    if (i < arraysize(channels)) {
      const int index = arraysize(channels) - i - 1;
      filter.add_channel(channels[index]);
      channel_added[index] = true;
    }
  }
}

TEST_F(VariationsSeedProcessorTest, CheckStudyFormFactor) {
  VariationsSeedProcessor seed_processor;

  const Study_FormFactor form_factors[] = {
    Study_FormFactor_DESKTOP,
    Study_FormFactor_PHONE,
    Study_FormFactor_TABLET,
  };

  ASSERT_EQ(Study_FormFactor_FormFactor_ARRAYSIZE,
            static_cast<int>(arraysize(form_factors)));

  bool form_factor_added[arraysize(form_factors)] = { 0 };
  Study_Filter filter;

  for (size_t i = 0; i <= arraysize(form_factors); ++i) {
    for (size_t j = 0; j < arraysize(form_factors); ++j) {
      const bool expected = form_factor_added[j] ||
                            filter.form_factor_size() == 0;
      const bool result = seed_processor.CheckStudyFormFactor(filter,
                                                              form_factors[j]);
      EXPECT_EQ(expected, result) << "Case " << i << "," << j << " failed!";
    }

    if (i < arraysize(form_factors)) {
      filter.add_form_factor(form_factors[i]);
      form_factor_added[i] = true;
    }
  }

  // Do the same check in the reverse order.
  filter.clear_form_factor();
  memset(&form_factor_added, 0, sizeof(form_factor_added));
  for (size_t i = 0; i <= arraysize(form_factors); ++i) {
    for (size_t j = 0; j < arraysize(form_factors); ++j) {
      const bool expected = form_factor_added[j] ||
                            filter.form_factor_size() == 0;
      const bool result = seed_processor.CheckStudyFormFactor(filter,
                                                              form_factors[j]);
      EXPECT_EQ(expected, result) << "Case " << i << "," << j << " failed!";
    }

    if (i < arraysize(form_factors)) {
      const int index = arraysize(form_factors) - i - 1;;
      filter.add_form_factor(form_factors[index]);
      form_factor_added[index] = true;
    }
  }
}

TEST_F(VariationsSeedProcessorTest, CheckStudyLocale) {
  VariationsSeedProcessor seed_processor;

  struct {
    const char* filter_locales;
    bool en_us_result;
    bool en_ca_result;
    bool fr_result;
  } test_cases[] = {
    {"en-US", true, false, false},
    {"en-US,en-CA,fr", true, true, true},
    {"en-US,en-CA,en-GB", true, true, false},
    {"en-GB,en-CA,en-US", true, true, false},
    {"ja,kr,vi", false, false, false},
    {"fr-CA", false, false, false},
    {"", true, true, true},
  };

  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(test_cases); ++i) {
    std::vector<std::string> filter_locales;
    Study_Filter filter;
    base::SplitString(test_cases[i].filter_locales, ',', &filter_locales);
    for (size_t j = 0; j < filter_locales.size(); ++j)
      filter.add_locale(filter_locales[j]);
    EXPECT_EQ(test_cases[i].en_us_result,
              seed_processor.CheckStudyLocale(filter, "en-US"));
    EXPECT_EQ(test_cases[i].en_ca_result,
              seed_processor.CheckStudyLocale(filter, "en-CA"));
    EXPECT_EQ(test_cases[i].fr_result,
              seed_processor.CheckStudyLocale(filter, "fr"));
  }
}

TEST_F(VariationsSeedProcessorTest, CheckStudyPlatform) {
  VariationsSeedProcessor seed_processor;

  const Study_Platform platforms[] = {
    Study_Platform_PLATFORM_WINDOWS,
    Study_Platform_PLATFORM_MAC,
    Study_Platform_PLATFORM_LINUX,
    Study_Platform_PLATFORM_CHROMEOS,
    Study_Platform_PLATFORM_ANDROID,
    Study_Platform_PLATFORM_IOS,
  };
  ASSERT_EQ(Study_Platform_Platform_ARRAYSIZE,
            static_cast<int>(arraysize(platforms)));
  bool platform_added[arraysize(platforms)] = { 0 };

  Study_Filter filter;

  // Check in the forwarded order. The loop cond is <= arraysize(platforms)
  // instead of < so that the result of adding the last channel gets checked.
  for (size_t i = 0; i <= arraysize(platforms); ++i) {
    for (size_t j = 0; j < arraysize(platforms); ++j) {
      const bool expected = platform_added[j] || filter.platform_size() == 0;
      const bool result = seed_processor.CheckStudyPlatform(filter,
                                                            platforms[j]);
      EXPECT_EQ(expected, result) << "Case " << i << "," << j << " failed!";
    }

    if (i < arraysize(platforms)) {
      filter.add_platform(platforms[i]);
      platform_added[i] = true;
    }
  }

  // Do the same check in the reverse order.
  filter.clear_platform();
  memset(&platform_added, 0, sizeof(platform_added));
  for (size_t i = 0; i <= arraysize(platforms); ++i) {
    for (size_t j = 0; j < arraysize(platforms); ++j) {
      const bool expected = platform_added[j] || filter.platform_size() == 0;
      const bool result = seed_processor.CheckStudyPlatform(filter,
                                                            platforms[j]);
      EXPECT_EQ(expected, result) << "Case " << i << "," << j << " failed!";
    }

    if (i < arraysize(platforms)) {
      const int index = arraysize(platforms) - i - 1;
      filter.add_platform(platforms[index]);
      platform_added[index] = true;
    }
  }
}

TEST_F(VariationsSeedProcessorTest, CheckStudyStartDate) {
  VariationsSeedProcessor seed_processor;

  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 },
  };

  Study_Filter filter;

  // Start date not set should result in true.
  EXPECT_TRUE(seed_processor.CheckStudyStartDate(filter, now));

  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(start_test_cases); ++i) {
    filter.set_start_date(TimeToProtoTime(start_test_cases[i].start_date));
    const bool result = seed_processor.CheckStudyStartDate(filter, now);
    EXPECT_EQ(start_test_cases[i].expected_result, result)
        << "Case " << i << " failed!";
  }
}

TEST_F(VariationsSeedProcessorTest, CheckStudyVersion) {
  VariationsSeedProcessor seed_processor;

  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 },
    // Wildcards.
    { "1.*", "1.2.3", true },
    { "1.2.*", "1.2.3", true },
    { "1.2.3.*", "1.2.3", true },
    { "1.2.4.*", "1.2.3", false },
    { "2.*", "1.2.3", false },
    { "0.3.*", "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 },
    // Wildcards
    { "2.1.*", "2.3.4", false },
    { "2.*", "2.3.4", true },
    { "2.3.*", "2.3.4", true },
    { "2.3.4.*", "2.3.4", true },
    { "2.3.4.0.*", "2.3.4", true },
    { "2.4.*", "2.3.4", true },
    { "1.3.*", "2.3.4", false },
    { "1.*", "2.3.4", false },
  };

  Study_Filter filter;

  // Min/max version not set should result in true.
  EXPECT_TRUE(seed_processor.CheckStudyVersion(filter, base::Version("1.2.3")));

  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(min_test_cases); ++i) {
    filter.set_min_version(min_test_cases[i].min_version);
    const bool result =
        seed_processor.CheckStudyVersion(filter,
                                         Version(min_test_cases[i].version));
    EXPECT_EQ(min_test_cases[i].expected_result, result) <<
        "Min. version case " << i << " failed!";
  }
  filter.clear_min_version();

  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(max_test_cases); ++i) {
    filter.set_max_version(max_test_cases[i].max_version);
    const bool result =
        seed_processor.CheckStudyVersion(filter,
                                         Version(max_test_cases[i].version));
    EXPECT_EQ(max_test_cases[i].expected_result, result) <<
        "Max version 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) {
      filter.set_min_version(min_test_cases[i].min_version);
      filter.set_max_version(max_test_cases[j].max_version);

      if (!min_test_cases[i].expected_result) {
        const bool result =
            seed_processor.CheckStudyVersion(
                filter, Version(min_test_cases[i].version));
        EXPECT_FALSE(result) << "Case " << i << "," << j << " failed!";
      }

      if (!max_test_cases[j].expected_result) {
        const bool result =
            seed_processor.CheckStudyVersion(
                filter, Version(max_test_cases[j].version));
        EXPECT_FALSE(result) << "Case " << i << "," << j << " failed!";
      }
    }
  }
}

TEST_F(VariationsSeedProcessorTest, FilterAndValidateStudies) {
  const std::string kTrial1Name = "A";
  const std::string kGroup1Name = "Group1";
  const std::string kTrial3Name = "B";

  VariationsSeed seed;
  Study* study1 = seed.add_study();
  study1->set_name(kTrial1Name);
  study1->set_default_experiment_name("Default");
  AddExperiment(kGroup1Name, 100, study1);
  AddExperiment("Default", 0, study1);

  Study* study2 = seed.add_study();
  *study2 = *study1;
  study2->mutable_experiment(0)->set_name("Bam");
  ASSERT_EQ(seed.study(0).name(), seed.study(1).name());

  Study* study3 = seed.add_study();
  study3->set_name(kTrial3Name);
  study3->set_default_experiment_name("Default");
  AddExperiment("A", 10, study3);
  AddExperiment("Default", 25, study3);

  std::vector<ProcessedStudy> processed_studies;
  VariationsSeedProcessor().FilterAndValidateStudies(
      seed, "en-CA", base::Time::Now(), base::Version("20.0.0.0"),
      Study_Channel_STABLE, Study_FormFactor_DESKTOP, &processed_studies);

  // Check that only the first kTrial1Name study was kept.
  ASSERT_EQ(2U, processed_studies.size());
  EXPECT_EQ(kTrial1Name, processed_studies[0].study()->name());
  EXPECT_EQ(kGroup1Name, processed_studies[0].study()->experiment(0).name());
  EXPECT_EQ(kTrial3Name, processed_studies[1].study()->name());
}

// Test that the group for kForcingFlag1 is forced.
TEST_F(VariationsSeedProcessorTest, ForceGroupWithFlag1) {
  CommandLine::ForCurrentProcess()->AppendSwitch(kForcingFlag1);

  base::FieldTrialList field_trial_list(NULL);

  Study study = CreateStudyWithFlagGroups(100, 0, 0);
  EXPECT_TRUE(CreateTrialFromStudy(&study));
  EXPECT_EQ(kFlagGroup1Name,
            base::FieldTrialList::FindFullName(kFlagStudyName));
}

// Test that the group for kForcingFlag2 is forced.
TEST_F(VariationsSeedProcessorTest, ForceGroupWithFlag2) {
  CommandLine::ForCurrentProcess()->AppendSwitch(kForcingFlag2);

  base::FieldTrialList field_trial_list(NULL);

  Study study = CreateStudyWithFlagGroups(100, 0, 0);
  EXPECT_TRUE(CreateTrialFromStudy(&study));
  EXPECT_EQ(kFlagGroup2Name,
            base::FieldTrialList::FindFullName(kFlagStudyName));
}

TEST_F(VariationsSeedProcessorTest, ForceGroup_ChooseFirstGroupWithFlag) {
  // Add the flag to the command line arguments so the flag group is forced.
  CommandLine::ForCurrentProcess()->AppendSwitch(kForcingFlag1);
  CommandLine::ForCurrentProcess()->AppendSwitch(kForcingFlag2);

  base::FieldTrialList field_trial_list(NULL);

  Study study = CreateStudyWithFlagGroups(100, 0, 0);
  EXPECT_TRUE(CreateTrialFromStudy(&study));
  EXPECT_EQ(kFlagGroup1Name,
            base::FieldTrialList::FindFullName(kFlagStudyName));
}

TEST_F(VariationsSeedProcessorTest, ForceGroup_DontChooseGroupWithFlag) {
  base::FieldTrialList field_trial_list(NULL);

  // The two flag groups are given high probability, which would normally make
  // them very likely to be chosen. They won't be chosen since flag groups are
  // never chosen when their flag isn't present.
  Study study = CreateStudyWithFlagGroups(1, 999, 999);
  EXPECT_TRUE(CreateTrialFromStudy(&study));
  EXPECT_EQ(kNonFlagGroupName,
            base::FieldTrialList::FindFullName(kFlagStudyName));
}

TEST_F(VariationsSeedProcessorTest, IsStudyExpired) {
  VariationsSeedProcessor seed_processor;

  const base::Time now = base::Time::Now();
  const base::TimeDelta delta = base::TimeDelta::FromHours(1);
  const struct {
    const base::Time expiry_date;
    bool expected_result;
  } expiry_test_cases[] = {
    { now - delta, true },
    { now, true },
    { now + delta, false },
  };

  Study study;

  // Expiry date not set should result in false.
  EXPECT_FALSE(seed_processor.IsStudyExpired(study, now));

  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 = seed_processor.IsStudyExpired(study, now);
    EXPECT_EQ(expiry_test_cases[i].expected_result, result)
        << "Case " << i << " failed!";
  }
}

TEST_F(VariationsSeedProcessorTest,
       NonExpiredStudyPrioritizedOverExpiredStudy) {
  VariationsSeedProcessor seed_processor;

  const std::string kTrialName = "A";
  const std::string kGroup1Name = "Group1";

  VariationsSeed seed;
  Study* study1 = seed.add_study();
  study1->set_name(kTrialName);
  study1->set_default_experiment_name("Default");
  AddExperiment(kGroup1Name, 100, study1);
  AddExperiment("Default", 0, study1);
  Study* study2 = seed.add_study();
  *study2 = *study1;
  ASSERT_EQ(seed.study(0).name(), seed.study(1).name());

  const base::Time year_ago =
      base::Time::Now() - base::TimeDelta::FromDays(365);

  const base::Version version("20.0.0.0");

  // Check that adding [expired, non-expired] activates the non-expired one.
  ASSERT_EQ(std::string(), base::FieldTrialList::FindFullName(kTrialName));
  {
    base::FieldTrialList field_trial_list(NULL);
    study1->set_expiry_date(TimeToProtoTime(year_ago));
    seed_processor.CreateTrialsFromSeed(seed, "en-CA", base::Time::Now(),
                                        version, Study_Channel_STABLE,
                                        Study_FormFactor_DESKTOP);
    EXPECT_EQ(kGroup1Name, base::FieldTrialList::FindFullName(kTrialName));
  }

  // Check that adding [non-expired, expired] activates the non-expired one.
  ASSERT_EQ(std::string(), base::FieldTrialList::FindFullName(kTrialName));
  {
    base::FieldTrialList field_trial_list(NULL);
    study1->clear_expiry_date();
    study2->set_expiry_date(TimeToProtoTime(year_ago));
    seed_processor.CreateTrialsFromSeed(seed, "en-CA", base::Time::Now(),
                                        version, Study_Channel_STABLE,
                                        Study_FormFactor_DESKTOP);
    EXPECT_EQ(kGroup1Name, base::FieldTrialList::FindFullName(kTrialName));
  }
}

TEST_F(VariationsSeedProcessorTest, ValidateStudy) {
  Study study;
  study.set_default_experiment_name("def");
  AddExperiment("abc", 100, &study);
  Study_Experiment* default_group = AddExperiment("def", 200, &study);

  ProcessedStudy processed_study;
  EXPECT_TRUE(processed_study.Init(&study, false));
  EXPECT_EQ(300, processed_study.total_probability());

  // Min version checks.
  study.mutable_filter()->set_min_version("1.2.3.*");
  EXPECT_TRUE(processed_study.Init(&study, false));
  study.mutable_filter()->set_min_version("1.*.3");
  EXPECT_FALSE(processed_study.Init(&study, false));
  study.mutable_filter()->set_min_version("1.2.3");
  EXPECT_TRUE(processed_study.Init(&study, false));

  // Max version checks.
  study.mutable_filter()->set_max_version("2.3.4.*");
  EXPECT_TRUE(processed_study.Init(&study, false));
  study.mutable_filter()->set_max_version("*.3");
  EXPECT_FALSE(processed_study.Init(&study, false));
  study.mutable_filter()->set_max_version("2.3.4");
  EXPECT_TRUE(processed_study.Init(&study, false));

  study.clear_default_experiment_name();
  EXPECT_FALSE(processed_study.Init(&study, false));

  study.set_default_experiment_name("xyz");
  EXPECT_FALSE(processed_study.Init(&study, false));

  study.set_default_experiment_name("def");
  default_group->clear_name();
  EXPECT_FALSE(processed_study.Init(&study, false));

  default_group->set_name("def");
  EXPECT_TRUE(processed_study.Init(&study, false));
  Study_Experiment* repeated_group = study.add_experiment();
  repeated_group->set_name("abc");
  repeated_group->set_probability_weight(1);
  EXPECT_FALSE(processed_study.Init(&study, false));
}

TEST_F(VariationsSeedProcessorTest, VariationParams) {
  base::FieldTrialList field_trial_list(NULL);

  Study study;
  study.set_name("Study1");
  study.set_default_experiment_name("B");

  Study_Experiment* experiment1 = AddExperiment("A", 1, &study);
  Study_Experiment_Param* param = experiment1->add_param();
  param->set_name("x");
  param->set_value("y");

  Study_Experiment* experiment2 = AddExperiment("B", 0, &study);

  EXPECT_TRUE(CreateTrialFromStudy(&study));
  EXPECT_EQ("y", GetVariationParamValue("Study1", "x"));

  study.set_name("Study2");
  experiment1->set_probability_weight(0);
  experiment2->set_probability_weight(1);
  EXPECT_TRUE(CreateTrialFromStudy(&study));
  EXPECT_EQ(std::string(), GetVariationParamValue("Study2", "x"));
}

TEST_F(VariationsSeedProcessorTest, VariationParamsWithForcingFlag) {
  Study study = CreateStudyWithFlagGroups(100, 0, 0);
  ASSERT_EQ(kForcingFlag1, study.experiment(1).forcing_flag());
  Study_Experiment_Param* param = study.mutable_experiment(1)->add_param();
  param->set_name("x");
  param->set_value("y");

  CommandLine::ForCurrentProcess()->AppendSwitch(kForcingFlag1);
  base::FieldTrialList field_trial_list(NULL);
  EXPECT_TRUE(CreateTrialFromStudy(&study));
  EXPECT_EQ(kFlagGroup1Name, base::FieldTrialList::FindFullName(study.name()));
  EXPECT_EQ("y", GetVariationParamValue(study.name(), "x"));
}

TEST_F(VariationsSeedProcessorTest, StartsActive) {
  base::FieldTrialList field_trial_list(NULL);

  VariationsSeed seed;
  Study* study1 = seed.add_study();
  study1->set_name("A");
  study1->set_default_experiment_name("Default");
  AddExperiment("AA", 100, study1);
  AddExperiment("Default", 0, study1);

  Study* study2 = seed.add_study();
  study2->set_name("B");
  study2->set_default_experiment_name("Default");
  AddExperiment("BB", 100, study2);
  AddExperiment("Default", 0, study2);
  study2->set_activation_type(Study_ActivationType_ACTIVATION_AUTO);

  Study* study3 = seed.add_study();
  study3->set_name("C");
  study3->set_default_experiment_name("Default");
  AddExperiment("CC", 100, study3);
  AddExperiment("Default", 0, study3);
  study3->set_activation_type(Study_ActivationType_ACTIVATION_EXPLICIT);

  VariationsSeedProcessor seed_processor;
  seed_processor.CreateTrialsFromSeed(seed, "en-CA", base::Time::Now(),
                                      base::Version("20.0.0.0"),
                                      Study_Channel_STABLE,
                                      Study_FormFactor_DESKTOP);

  // Non-specified and ACTIVATION_EXPLICIT should not start active, but
  // ACTIVATION_AUTO should.
  EXPECT_FALSE(IsFieldTrialActive("A"));
  EXPECT_TRUE(IsFieldTrialActive("B"));
  EXPECT_FALSE(IsFieldTrialActive("C"));

  EXPECT_EQ("AA", base::FieldTrialList::FindFullName("A"));
  EXPECT_EQ("BB", base::FieldTrialList::FindFullName("B"));
  EXPECT_EQ("CC", base::FieldTrialList::FindFullName("C"));

  // Now, all studies should be active.
  EXPECT_TRUE(IsFieldTrialActive("A"));
  EXPECT_TRUE(IsFieldTrialActive("B"));
  EXPECT_TRUE(IsFieldTrialActive("C"));
}

TEST_F(VariationsSeedProcessorTest, StartsActiveWithFlag) {
  CommandLine::ForCurrentProcess()->AppendSwitch(kForcingFlag1);

  base::FieldTrialList field_trial_list(NULL);

  Study study = CreateStudyWithFlagGroups(100, 0, 0);
  study.set_activation_type(Study_ActivationType_ACTIVATION_AUTO);

  EXPECT_TRUE(CreateTrialFromStudy(&study));
  EXPECT_TRUE(IsFieldTrialActive(kFlagStudyName));

  EXPECT_EQ(kFlagGroup1Name,
            base::FieldTrialList::FindFullName(kFlagStudyName));
}

}  // namespace chrome_variations