init/util_test.cpp

/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "util.h"

#include <errno.h>
#include <gtest/gtest.h>

TEST(util, read_file_ENOENT) {
  std::string s("hello");
  errno = 0;
  EXPECT_FALSE(read_file("/proc/does-not-exist", &s));
  EXPECT_EQ(ENOENT, errno);
  EXPECT_EQ("", s); // s was cleared.
}

TEST(util, read_file_success) {
  std::string s("hello");
  EXPECT_TRUE(read_file("/proc/version", &s));
  EXPECT_GT(s.length(), 6U);
  EXPECT_EQ('\n', s[s.length() - 1]);
  s[5] = 0;
  EXPECT_STREQ("Linux", s.c_str());
}