Migrate --enable-arc and --arc-available part 1.

components/arc/arc_util_unittest.cc

+// Copyright 2017 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/arc/arc_util.h"
+
+#include <memory>
+
+#include "base/command_line.h"
+#include "base/macros.h"
+#include "base/memory/ptr_util.h"
+#include "base/test/scoped_feature_list.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace arc {
+namespace {
+
+// If an instance is created, based on the value passed to the consturctor,
+// EnableARC feature is enabled/disabled in the scope.
+class ScopedArcFeature {
+ public:
+  explicit ScopedArcFeature(bool enabled) {
+    constexpr char kArcFeatureName[] = "EnableARC";
+    if (enabled) {
+      feature_list.InitFromCommandLine(kArcFeatureName, std::string());
+    } else {
+      feature_list.InitFromCommandLine(std::string(), kArcFeatureName);
+    }
+  }
+  ~ScopedArcFeature() = default;
+
+ private:
+  base::test::ScopedFeatureList feature_list;
+  DISALLOW_COPY_AND_ASSIGN(ScopedArcFeature);
+};
+
+using ArcUtilTest = testing::Test;
+
+// Test --arc-available with EnableARC feature combination.
+TEST_F(ArcUtilTest, IsArcAvailable_Installed) {
+  auto* command_line = base::CommandLine::ForCurrentProcess();
+
+  // If ARC is not installed, IsArcAvailable() should return false,
+  // regardless of EnableARC feature.
+  command_line->InitFromArgv({""});
+
+  // Not available, by-default.
+  EXPECT_FALSE(IsArcAvailable());
+
+  {
+    ScopedArcFeature feature(true);
+    EXPECT_FALSE(IsArcAvailable());
+  }
+  {
+    ScopedArcFeature feature(false);
+    EXPECT_FALSE(IsArcAvailable());
+  }
+
+  // If ARC is installed, IsArcAvailable() should return true when EnableARC
+  // feature is set.
+  command_line->InitFromArgv({"", "--arc-available"});
+
+  // Not available, by-default, too.
+  EXPECT_FALSE(IsArcAvailable());
+
+  {
+    ScopedArcFeature feature(true);
+    EXPECT_TRUE(IsArcAvailable());
+  }
+  {
+    ScopedArcFeature feature(false);
+    EXPECT_FALSE(IsArcAvailable());
+  }
+}
+
+TEST_F(ArcUtilTest, IsArcAvailable_OfficialSupport) {
+  // Regardless of FeatureList, IsArcAvailable() should return true.
+  auto* command_line = base::CommandLine::ForCurrentProcess();
+  command_line->InitFromArgv({"", "--enable-arc"});
+  EXPECT_TRUE(IsArcAvailable());
+}
+
+}  // namespace
+}  // namespace arc