adb: extract Windows bits out of directory_exists test.

  ASSERT_TRUE(directory_exists(profiles_dir));

  ASSERT_FALSE(directory_exists(subdir(profiles_dir, "does-not-exist")));

#else

  ASSERT_TRUE(directory_exists("/proc"));

  ASSERT_FALSE(directory_exists("/proc/self")); // Symbolic link.

  ASSERT_FALSE(directory_exists("/proc/does-not-exist"));

#endif

}

#if defined(_WIN32)

TEST(adb_utils, directory_exists_win32_symlink_junction) {

  char profiles_dir[MAX_PATH];

  DWORD cch = arraysize(profiles_dir);

  // On typical Windows 7, returns C:\Users

  ASSERT_TRUE(GetProfilesDirectoryA(profiles_dir, &cch));

  // On modern (English?) Windows, this is a directory symbolic link to

  // C:\ProgramData. Symbolic links are rare on Windows and the user requires

  // a special permission (by default granted to Administrative users) to

  // create symbolic links.

  ASSERT_FALSE(directory_exists(subdir(profiles_dir, "All Users")));

  EXPECT_FALSE(directory_exists(subdir(profiles_dir, "All Users")));

  // On modern (English?) Windows, this is a directory junction to

  // C:\Users\Default. Junctions are used throughout user profile directories

  // for backwards compatibility and they don't require any special permissions

  // to create.

  ASSERT_FALSE(directory_exists(subdir(profiles_dir, "Default User")));

  ASSERT_FALSE(directory_exists(subdir(profiles_dir, "does-not-exist")));

#else

  ASSERT_TRUE(directory_exists("/proc"));

  ASSERT_FALSE(directory_exists("/proc/self")); // Symbolic link.

  ASSERT_FALSE(directory_exists("/proc/does-not-exist"));

#endif

  EXPECT_FALSE(directory_exists(subdir(profiles_dir, "Default User")));

}

#endif

TEST(adb_utils, escape_arg) {

  ASSERT_EQ(R"('')", escape_arg(""));