tools/json_schema_compiler/test/features_generation_unittest.cc - chromium/src - Git at Google

 // Copyright 2016 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 "base/optional.h"
 #include "extensions/common/features/complex_feature.h"
 #include "extensions/common/features/feature.h"
 #include "extensions/common/features/feature_provider.h"
 #include "extensions/common/features/simple_feature.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "tools/json_schema_compiler/test/features_compiler_test.h"

 namespace extensions {

 namespace {

 template <typename T>
 void ExpectVectorsEqual(std::vector<T> expected,
                         std::vector<T> actual,
                         const std::string& name) {
   std::sort(expected.begin(), expected.end());
   std::sort(actual.begin(), actual.end());
   EXPECT_EQ(expected, actual) << name;
 }

 const bool kDefaultAutoGrant = true;
 const bool kDefaultInternal = false;

 }  // namespace

 // A utility object for comparing a feature with its expected value.
 struct FeatureComparator {
  public:
   explicit FeatureComparator(const std::string& name);
   ~FeatureComparator();

   void CompareFeature(const SimpleFeature* feature);

   std::string name;
   std::vector<std::string> blocklist;
   std::vector<std::string> allowlist;
   std::vector<std::string> dependencies;
   std::vector<Manifest::Type> extension_types;
   std::vector<Feature::Context> contexts;
   std::vector<Feature::Platform> platforms;

   URLPatternSet matches;

   base::Optional<SimpleFeature::Location> location;
   base::Optional<int> min_manifest_version;
   base::Optional<int> max_manifest_version;
   base::Optional<std::string> command_line_switch;
   base::Optional<version_info::Channel> channel;

   std::string alias;
   std::string source;

   bool component_extensions_auto_granted;
   bool internal;
 };

 FeatureComparator::FeatureComparator(const std::string& name)
     : name(name),
       component_extensions_auto_granted(kDefaultAutoGrant),
       internal(kDefaultInternal) {}

 FeatureComparator::~FeatureComparator() = default;

 void FeatureComparator::CompareFeature(const SimpleFeature* feature) {
   ASSERT_TRUE(feature);
   EXPECT_EQ(name, feature->name());
   ExpectVectorsEqual(blocklist, feature->blocklist(), name);
   ExpectVectorsEqual(allowlist, feature->allowlist(), name);
   ExpectVectorsEqual(dependencies, feature->dependencies(), name);
   ExpectVectorsEqual(extension_types, feature->extension_types(), name);
   ExpectVectorsEqual(contexts, feature->contexts(), name);
   ExpectVectorsEqual(platforms, feature->platforms(), name);
   EXPECT_EQ(matches, feature->matches()) << name;
   EXPECT_EQ(location, feature->location()) << name;
   EXPECT_EQ(min_manifest_version, feature->min_manifest_version()) << name;
   EXPECT_EQ(max_manifest_version, feature->max_manifest_version()) << name;
   EXPECT_EQ(component_extensions_auto_granted,
             feature->component_extensions_auto_granted())
       << name;
   EXPECT_EQ(command_line_switch, feature->command_line_switch()) << name;
   EXPECT_EQ(channel, feature->channel()) << name;
   EXPECT_EQ(internal, feature->IsInternal()) << name;
   EXPECT_EQ(alias, feature->alias()) << name;
   EXPECT_EQ(source, feature->source()) << name;
 }

 TEST(FeaturesGenerationTest, FeaturesTest) {
   FeatureProvider provider;
   CompilerTestAddFeaturesMethod(&provider);

   auto GetAsSimpleFeature = [&provider](const std::string& name) {
     const Feature* feature = provider.GetFeature(name);
     // Shame we can't test this more safely, but if our feature is declared as
     // the wrong class, things should blow up in a spectacular fashion.
     return static_cast<const SimpleFeature*>(feature);
   };

   auto GetAsComplexFeature = [&provider](const std::string& name) {
     const Feature* feature = provider.GetFeature(name);
     // Shame we can't test this more safely, but if our feature is declared as
     // the wrong class, things should blow up in a spectacular fashion.
     return static_cast<const ComplexFeature*>(feature);
   };

   // Check some simple features for accuracy.
   {
     const SimpleFeature* feature = GetAsSimpleFeature("alpha");
     FeatureComparator comparator("alpha");
     comparator.dependencies = {"permission:alpha"};
     comparator.contexts = {Feature::BLESSED_EXTENSION_CONTEXT};
     comparator.channel = version_info::Channel::STABLE;
     comparator.max_manifest_version = 1;
     comparator.CompareFeature(feature);
   }
   {
     const SimpleFeature* feature = GetAsSimpleFeature("beta");
     FeatureComparator comparator("beta");
     comparator.contexts = {Feature::BLESSED_EXTENSION_CONTEXT};
     comparator.channel = version_info::Channel::DEV;
     comparator.extension_types = {Manifest::TYPE_EXTENSION,
                                   Manifest::TYPE_PLATFORM_APP};
     comparator.location = SimpleFeature::COMPONENT_LOCATION;
     comparator.allowlist = {"aaa", "bbb"};
     comparator.blocklist = {"zzz", "yyy"};
     comparator.component_extensions_auto_granted = false;
     comparator.CompareFeature(feature);
   }
   {
     const SimpleFeature* feature = GetAsSimpleFeature("gamma");
     FeatureComparator comparator("gamma");
     comparator.channel = version_info::Channel::BETA;
     comparator.platforms = {Feature::WIN_PLATFORM, Feature::MACOSX_PLATFORM};
     comparator.contexts = {Feature::BLESSED_EXTENSION_CONTEXT};
     comparator.dependencies = {"permission:gamma"};
     comparator.extension_types = {Manifest::TYPE_EXTENSION};
     comparator.internal = true;
     comparator.CompareFeature(feature);

     // A child feature should inherit all fields from its parent, except in the
     // case that it specifies its own value. Thus, we reuse |comparator|.
     feature = GetAsSimpleFeature("gamma.child");
     comparator.name = "gamma.child";
     comparator.allowlist = {"ccc"};
     comparator.platforms = {Feature::LINUX_PLATFORM};
     comparator.dependencies.clear();
     comparator.CompareFeature(feature);
   }
   {
     // Features that specify 'noparent' should not inherit features from any
     // other feature.
     const SimpleFeature* feature = GetAsSimpleFeature("gamma.unparented");
     FeatureComparator comparator("gamma.unparented");
     comparator.blocklist = {"ddd"};
     comparator.contexts = {Feature::UNBLESSED_EXTENSION_CONTEXT};
     comparator.channel = version_info::Channel::DEV;
     comparator.CompareFeature(feature);
   }
   {
     const ComplexFeature* complex_feature =
         GetAsComplexFeature("gamma.complex_unparented");
     FeatureComparator comparator("gamma.complex_unparented");
     comparator.contexts = {Feature::UNBLESSED_EXTENSION_CONTEXT};
     comparator.channel = version_info::Channel::STABLE;
     // We cheat and have both children exactly the same for ease of comparing;
     // complex features are tested more thoroughly below.
     for (const auto& feature : complex_feature->features_)
       comparator.CompareFeature(static_cast<SimpleFeature*>(feature.get()));
   }
   {
     const SimpleFeature* feature = GetAsSimpleFeature("delta");
     FeatureComparator comparator("delta");
     comparator.contexts = {Feature::BLESSED_EXTENSION_CONTEXT,
                            Feature::WEBUI_CONTEXT};
     comparator.channel = version_info::Channel::DEV;
     comparator.matches.AddPattern(
         URLPattern(URLPattern::SCHEME_ALL, "*://example.com/*"));
     comparator.min_manifest_version = 2;
     comparator.CompareFeature(feature);
   }
   {
     const SimpleFeature* feature = GetAsSimpleFeature("allEnum");
     FeatureComparator comparator("allEnum");
     comparator.contexts = {Feature::BLESSED_EXTENSION_CONTEXT,
                            Feature::BLESSED_WEB_PAGE_CONTEXT,
                            Feature::CONTENT_SCRIPT_CONTEXT,
                            Feature::LOCK_SCREEN_EXTENSION_CONTEXT,
                            Feature::SERVICE_WORKER_CONTEXT,
                            Feature::WEB_PAGE_CONTEXT,
                            Feature::WEBUI_CONTEXT,
                            Feature::UNBLESSED_EXTENSION_CONTEXT};
     comparator.extension_types = {
         Manifest::TYPE_EXTENSION,           Manifest::TYPE_HOSTED_APP,
         Manifest::TYPE_LEGACY_PACKAGED_APP, Manifest::TYPE_PLATFORM_APP,
         Manifest::TYPE_SHARED_MODULE,       Manifest::TYPE_THEME};
     comparator.channel = version_info::Channel::BETA;
     comparator.CompareFeature(feature);
   }
   {
     // Omega is imported from a second .json file.
     const SimpleFeature* feature = GetAsSimpleFeature("omega");
     FeatureComparator comparator("omega");
     comparator.contexts = {Feature::WEB_PAGE_CONTEXT};
     comparator.channel = version_info::Channel::DEV;
     comparator.min_manifest_version = 2;
     comparator.CompareFeature(feature);
   }
   {
     // Features specifying 'nocompile' should not be generated at all.
     const SimpleFeature* feature = GetAsSimpleFeature("uncompiled");
     EXPECT_FALSE(feature);
   }

   // Test complex features.
   {
     const ComplexFeature* feature = GetAsComplexFeature("complex");
     ASSERT_TRUE(feature);
     EXPECT_EQ(2u, feature->features_.size());
     // Find the default parent. This is a little tedious because it might not
     // be guaranteed that the default_parent is in a specific index, but it
     // specifies channel as 'stable'.
     const SimpleFeature* default_parent = nullptr;
     const SimpleFeature* other_parent = nullptr;
     {
       const SimpleFeature* parent1 =
           static_cast<SimpleFeature*>(feature->features_[0].get());
       const SimpleFeature* parent2 =
           static_cast<SimpleFeature*>(feature->features_[1].get());
       if (parent1->channel() == version_info::Channel::STABLE) {
         default_parent = parent1;
         other_parent = parent2;
       } else {
         other_parent = parent1;
         default_parent = parent2;
       }
     }
     {
       // Check the default parent.
       FeatureComparator comparator("complex");
       comparator.channel = version_info::Channel::STABLE;
       comparator.contexts = {Feature::BLESSED_EXTENSION_CONTEXT};
       comparator.extension_types = {Manifest::TYPE_EXTENSION};
       comparator.CompareFeature(default_parent);
       // Check the child of the complex feature. It should inherit its
       // properties from the default parent.
       const SimpleFeature* child_feature = GetAsSimpleFeature("complex.child");
       comparator.name = "complex.child";
       comparator.platforms = {Feature::WIN_PLATFORM};
       comparator.dependencies = {"permission:complex.child"};
       comparator.CompareFeature(child_feature);
     }
     {
       // Finally, check the branch of the complex feature.
       FeatureComparator comparator("complex");
       comparator.channel = version_info::Channel::BETA;
       comparator.contexts = {Feature::BLESSED_EXTENSION_CONTEXT};
       comparator.extension_types = {Manifest::TYPE_EXTENSION};
       comparator.allowlist = {"aaa"};
       comparator.CompareFeature(other_parent);
     }
   }

   // Test API aliases.
   {
     const SimpleFeature* feature = GetAsSimpleFeature("alias");
     FeatureComparator comparator("alias");
     comparator.contexts = {Feature::BLESSED_EXTENSION_CONTEXT};
     comparator.channel = version_info::Channel::STABLE;
     comparator.source = "alias_source";
     comparator.CompareFeature(feature);
   }
   {
     const SimpleFeature* feature = GetAsSimpleFeature("alias_source");
     FeatureComparator comparator("alias_source");
     comparator.contexts = {Feature::BLESSED_EXTENSION_CONTEXT};
     comparator.channel = version_info::Channel::STABLE;
     comparator.alias = "alias";
     comparator.CompareFeature(feature);
   }
   {
     const Feature* feature = provider.GetFeature("complex_alias");
     ASSERT_EQ("", feature->alias());
     ASSERT_EQ("complex_alias_source", feature->source());
   }
   {
     const Feature* feature = provider.GetFeature("complex_alias_source");
     ASSERT_EQ("complex_alias", feature->alias());
     ASSERT_EQ("", feature->source());
   }
   {
     const Feature* feature = provider.GetFeature("parent_source");
     ASSERT_EQ("parent_source_alias", feature->alias());
     ASSERT_EQ("", feature->source());
   }
   {
     const Feature* feature = provider.GetFeature("parent_source.child");
     ASSERT_EQ("parent_source_alias", feature->alias());
     ASSERT_EQ("", feature->source());
   }
   {
     const Feature* feature = provider.GetFeature("parent_source.child_source");
     ASSERT_EQ("parent_source_child_alias", feature->alias());
     ASSERT_EQ("", feature->source());
   }
   {
     const Feature* feature = provider.GetFeature("alias_parent");
     ASSERT_EQ("", feature->alias());
     ASSERT_EQ("", feature->source());
   }
   {
     const Feature* feature = provider.GetFeature("alias_parent.child");
     ASSERT_EQ("", feature->alias());
     ASSERT_EQ("child_source", feature->source());
   }
 }

 }  // namespace extensions
	// Copyright 2016 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 "base/optional.h"
	#include "extensions/common/features/complex_feature.h"
	#include "extensions/common/features/feature.h"
	#include "extensions/common/features/feature_provider.h"
	#include "extensions/common/features/simple_feature.h"
	#include "testing/gtest/include/gtest/gtest.h"
	#include "tools/json_schema_compiler/test/features_compiler_test.h"

	namespace extensions {

	namespace {

	template <typename T>
	void ExpectVectorsEqual(std::vector<T> expected,
	std::vector<T> actual,
	const std::string& name) {
	std::sort(expected.begin(), expected.end());
	std::sort(actual.begin(), actual.end());
	EXPECT_EQ(expected, actual) << name;
	}

	const bool kDefaultAutoGrant = true;
	const bool kDefaultInternal = false;

	} // namespace

	// A utility object for comparing a feature with its expected value.
	struct FeatureComparator {
	public:
	explicit FeatureComparator(const std::string& name);
	~FeatureComparator();

	void CompareFeature(const SimpleFeature* feature);

	std::string name;
	std::vector<std::string> blocklist;
	std::vector<std::string> allowlist;
	std::vector<std::string> dependencies;
	std::vector<Manifest::Type> extension_types;
	std::vector<Feature::Context> contexts;
	std::vector<Feature::Platform> platforms;

	URLPatternSet matches;

	base::Optional<SimpleFeature::Location> location;
	base::Optional<int> min_manifest_version;
	base::Optional<int> max_manifest_version;
	base::Optional<std::string> command_line_switch;
	base::Optional<version_info::Channel> channel;

	std::string alias;
	std::string source;

	bool component_extensions_auto_granted;
	bool internal;
	};

	FeatureComparator::FeatureComparator(const std::string& name)
	: name(name),
	component_extensions_auto_granted(kDefaultAutoGrant),
	internal(kDefaultInternal) {}

	FeatureComparator::~FeatureComparator() = default;

	void FeatureComparator::CompareFeature(const SimpleFeature* feature) {
	ASSERT_TRUE(feature);
	EXPECT_EQ(name, feature->name());
	ExpectVectorsEqual(blocklist, feature->blocklist(), name);
	ExpectVectorsEqual(allowlist, feature->allowlist(), name);
	ExpectVectorsEqual(dependencies, feature->dependencies(), name);
	ExpectVectorsEqual(extension_types, feature->extension_types(), name);
	ExpectVectorsEqual(contexts, feature->contexts(), name);
	ExpectVectorsEqual(platforms, feature->platforms(), name);
	EXPECT_EQ(matches, feature->matches()) << name;
	EXPECT_EQ(location, feature->location()) << name;
	EXPECT_EQ(min_manifest_version, feature->min_manifest_version()) << name;
	EXPECT_EQ(max_manifest_version, feature->max_manifest_version()) << name;
	EXPECT_EQ(component_extensions_auto_granted,
	feature->component_extensions_auto_granted())
	<< name;
	EXPECT_EQ(command_line_switch, feature->command_line_switch()) << name;
	EXPECT_EQ(channel, feature->channel()) << name;
	EXPECT_EQ(internal, feature->IsInternal()) << name;
	EXPECT_EQ(alias, feature->alias()) << name;
	EXPECT_EQ(source, feature->source()) << name;
	}

	TEST(FeaturesGenerationTest, FeaturesTest) {
	FeatureProvider provider;
	CompilerTestAddFeaturesMethod(&provider);

	auto GetAsSimpleFeature = [&provider](const std::string& name) {
	const Feature* feature = provider.GetFeature(name);
	// Shame we can't test this more safely, but if our feature is declared as
	// the wrong class, things should blow up in a spectacular fashion.
	return static_cast<const SimpleFeature*>(feature);
	};

	auto GetAsComplexFeature = [&provider](const std::string& name) {
	const Feature* feature = provider.GetFeature(name);
	// Shame we can't test this more safely, but if our feature is declared as
	// the wrong class, things should blow up in a spectacular fashion.
	return static_cast<const ComplexFeature*>(feature);
	};

	// Check some simple features for accuracy.
	{
	const SimpleFeature* feature = GetAsSimpleFeature("alpha");
	FeatureComparator comparator("alpha");
	comparator.dependencies = {"permission:alpha"};
	comparator.contexts = {Feature::BLESSED_EXTENSION_CONTEXT};
	comparator.channel = version_info::Channel::STABLE;
	comparator.max_manifest_version = 1;
	comparator.CompareFeature(feature);
	}
	{
	const SimpleFeature* feature = GetAsSimpleFeature("beta");
	FeatureComparator comparator("beta");
	comparator.contexts = {Feature::BLESSED_EXTENSION_CONTEXT};
	comparator.channel = version_info::Channel::DEV;
	comparator.extension_types = {Manifest::TYPE_EXTENSION,
	Manifest::TYPE_PLATFORM_APP};
	comparator.location = SimpleFeature::COMPONENT_LOCATION;
	comparator.allowlist = {"aaa", "bbb"};
	comparator.blocklist = {"zzz", "yyy"};
	comparator.component_extensions_auto_granted = false;
	comparator.CompareFeature(feature);
	}
	{
	const SimpleFeature* feature = GetAsSimpleFeature("gamma");
	FeatureComparator comparator("gamma");
	comparator.channel = version_info::Channel::BETA;
	comparator.platforms = {Feature::WIN_PLATFORM, Feature::MACOSX_PLATFORM};
	comparator.contexts = {Feature::BLESSED_EXTENSION_CONTEXT};
	comparator.dependencies = {"permission:gamma"};
	comparator.extension_types = {Manifest::TYPE_EXTENSION};
	comparator.internal = true;
	comparator.CompareFeature(feature);

	// A child feature should inherit all fields from its parent, except in the
	// case that it specifies its own value. Thus, we reuse \|comparator\|.
	feature = GetAsSimpleFeature("gamma.child");
	comparator.name = "gamma.child";
	comparator.allowlist = {"ccc"};
	comparator.platforms = {Feature::LINUX_PLATFORM};
	comparator.dependencies.clear();
	comparator.CompareFeature(feature);
	}
	{
	// Features that specify 'noparent' should not inherit features from any
	// other feature.
	const SimpleFeature* feature = GetAsSimpleFeature("gamma.unparented");
	FeatureComparator comparator("gamma.unparented");
	comparator.blocklist = {"ddd"};
	comparator.contexts = {Feature::UNBLESSED_EXTENSION_CONTEXT};
	comparator.channel = version_info::Channel::DEV;
	comparator.CompareFeature(feature);
	}
	{
	const ComplexFeature* complex_feature =
	GetAsComplexFeature("gamma.complex_unparented");
	FeatureComparator comparator("gamma.complex_unparented");
	comparator.contexts = {Feature::UNBLESSED_EXTENSION_CONTEXT};
	comparator.channel = version_info::Channel::STABLE;
	// We cheat and have both children exactly the same for ease of comparing;
	// complex features are tested more thoroughly below.
	for (const auto& feature : complex_feature->features_)
	comparator.CompareFeature(static_cast<SimpleFeature*>(feature.get()));
	}
	{
	const SimpleFeature* feature = GetAsSimpleFeature("delta");
	FeatureComparator comparator("delta");
	comparator.contexts = {Feature::BLESSED_EXTENSION_CONTEXT,
	Feature::WEBUI_CONTEXT};
	comparator.channel = version_info::Channel::DEV;
	comparator.matches.AddPattern(
	URLPattern(URLPattern::SCHEME_ALL, "://example.com/"));
	comparator.min_manifest_version = 2;
	comparator.CompareFeature(feature);
	}
	{
	const SimpleFeature* feature = GetAsSimpleFeature("allEnum");
	FeatureComparator comparator("allEnum");
	comparator.contexts = {Feature::BLESSED_EXTENSION_CONTEXT,
	Feature::BLESSED_WEB_PAGE_CONTEXT,
	Feature::CONTENT_SCRIPT_CONTEXT,
	Feature::LOCK_SCREEN_EXTENSION_CONTEXT,
	Feature::SERVICE_WORKER_CONTEXT,
	Feature::WEB_PAGE_CONTEXT,
	Feature::WEBUI_CONTEXT,
	Feature::UNBLESSED_EXTENSION_CONTEXT};
	comparator.extension_types = {
	Manifest::TYPE_EXTENSION, Manifest::TYPE_HOSTED_APP,
	Manifest::TYPE_LEGACY_PACKAGED_APP, Manifest::TYPE_PLATFORM_APP,
	Manifest::TYPE_SHARED_MODULE, Manifest::TYPE_THEME};
	comparator.channel = version_info::Channel::BETA;
	comparator.CompareFeature(feature);
	}
	{
	// Omega is imported from a second .json file.
	const SimpleFeature* feature = GetAsSimpleFeature("omega");
	FeatureComparator comparator("omega");
	comparator.contexts = {Feature::WEB_PAGE_CONTEXT};
	comparator.channel = version_info::Channel::DEV;
	comparator.min_manifest_version = 2;
	comparator.CompareFeature(feature);
	}
	{
	// Features specifying 'nocompile' should not be generated at all.
	const SimpleFeature* feature = GetAsSimpleFeature("uncompiled");
	EXPECT_FALSE(feature);
	}

	// Test complex features.
	{
	const ComplexFeature* feature = GetAsComplexFeature("complex");
	ASSERT_TRUE(feature);
	EXPECT_EQ(2u, feature->features_.size());
	// Find the default parent. This is a little tedious because it might not
	// be guaranteed that the default_parent is in a specific index, but it
	// specifies channel as 'stable'.
	const SimpleFeature* default_parent = nullptr;
	const SimpleFeature* other_parent = nullptr;
	{
	const SimpleFeature* parent1 =
	static_cast<SimpleFeature*>(feature->features_[0].get());
	const SimpleFeature* parent2 =
	static_cast<SimpleFeature*>(feature->features_[1].get());
	if (parent1->channel() == version_info::Channel::STABLE) {
	default_parent = parent1;
	other_parent = parent2;
	} else {
	other_parent = parent1;
	default_parent = parent2;
	}
	}
	{
	// Check the default parent.
	FeatureComparator comparator("complex");
	comparator.channel = version_info::Channel::STABLE;
	comparator.contexts = {Feature::BLESSED_EXTENSION_CONTEXT};
	comparator.extension_types = {Manifest::TYPE_EXTENSION};
	comparator.CompareFeature(default_parent);
	// Check the child of the complex feature. It should inherit its
	// properties from the default parent.
	const SimpleFeature* child_feature = GetAsSimpleFeature("complex.child");
	comparator.name = "complex.child";
	comparator.platforms = {Feature::WIN_PLATFORM};
	comparator.dependencies = {"permission:complex.child"};
	comparator.CompareFeature(child_feature);
	}
	{
	// Finally, check the branch of the complex feature.
	FeatureComparator comparator("complex");
	comparator.channel = version_info::Channel::BETA;
	comparator.contexts = {Feature::BLESSED_EXTENSION_CONTEXT};
	comparator.extension_types = {Manifest::TYPE_EXTENSION};
	comparator.allowlist = {"aaa"};
	comparator.CompareFeature(other_parent);
	}
	}

	// Test API aliases.
	{
	const SimpleFeature* feature = GetAsSimpleFeature("alias");
	FeatureComparator comparator("alias");
	comparator.contexts = {Feature::BLESSED_EXTENSION_CONTEXT};
	comparator.channel = version_info::Channel::STABLE;
	comparator.source = "alias_source";
	comparator.CompareFeature(feature);
	}
	{
	const SimpleFeature* feature = GetAsSimpleFeature("alias_source");
	FeatureComparator comparator("alias_source");
	comparator.contexts = {Feature::BLESSED_EXTENSION_CONTEXT};
	comparator.channel = version_info::Channel::STABLE;
	comparator.alias = "alias";
	comparator.CompareFeature(feature);
	}
	{
	const Feature* feature = provider.GetFeature("complex_alias");
	ASSERT_EQ("", feature->alias());
	ASSERT_EQ("complex_alias_source", feature->source());
	}
	{
	const Feature* feature = provider.GetFeature("complex_alias_source");
	ASSERT_EQ("complex_alias", feature->alias());
	ASSERT_EQ("", feature->source());
	}
	{
	const Feature* feature = provider.GetFeature("parent_source");
	ASSERT_EQ("parent_source_alias", feature->alias());
	ASSERT_EQ("", feature->source());
	}
	{
	const Feature* feature = provider.GetFeature("parent_source.child");
	ASSERT_EQ("parent_source_alias", feature->alias());
	ASSERT_EQ("", feature->source());
	}
	{
	const Feature* feature = provider.GetFeature("parent_source.child_source");
	ASSERT_EQ("parent_source_child_alias", feature->alias());
	ASSERT_EQ("", feature->source());
	}
	{
	const Feature* feature = provider.GetFeature("alias_parent");
	ASSERT_EQ("", feature->alias());
	ASSERT_EQ("", feature->source());
	}
	{
	const Feature* feature = provider.GetFeature("alias_parent.child");
	ASSERT_EQ("", feature->alias());
	ASSERT_EQ("child_source", feature->source());
	}
	}

	} // namespace extensions