libc/test/src/unistd/readlink_test.cpp

   1 //===-- Unittests for readlink --------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/__support/CPP/string_view.h"
  10 #include "src/errno/libc_errno.h"
  11 #include "src/string/string_utils.h"
  12 #include "src/unistd/readlink.h"
  13 #include "src/unistd/symlink.h"
  14 #include "src/unistd/unlink.h"
  15 #include "test/UnitTest/ErrnoSetterMatcher.h"
  16 #include "test/UnitTest/Test.h"
  17
  18 namespace cpp = LIBC_NAMESPACE::cpp;
  19
  20 TEST(LlvmLibcReadlinkTest, CreateAndUnlink) {
  21   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
  22   constexpr const char *FILENAME = "readlink_test_file";
  23   auto LINK_VAL = libc_make_test_file_path(FILENAME);
  24   constexpr const char *FILENAME2 = "readlink_test_file.link";
  25   auto LINK = libc_make_test_file_path(FILENAME2);
  26   LIBC_NAMESPACE::libc_errno = 0;
  27
  28   // The test strategy is as follows:
  29   //   1. Create a symlink with value LINK_VAL.
  30   //   2. Read the symlink with readlink. The link value read should be LINK_VAL
  31   //   3. Cleanup the symlink created in step #1.
  32   ASSERT_THAT(LIBC_NAMESPACE::symlink(LINK_VAL, LINK), Succeeds(0));
  33
  34   char buf[256];
  35   ssize_t len = LIBC_NAMESPACE::readlink(
  36       LINK, buf, LIBC_NAMESPACE::internal::string_length(FILENAME));
  37   ASSERT_ERRNO_SUCCESS();
  38   ASSERT_EQ(cpp::string_view(buf, len), cpp::string_view(LINK_VAL));
  39
  40   ASSERT_THAT(LIBC_NAMESPACE::unlink(LINK), Succeeds(0));
  41 }
  42
  43 TEST(LlvmLibcReadlinkTest, ReadlinkInNonExistentPath) {
  44   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
  45   constexpr auto LEN = 8;
  46   char buf[LEN];
  47   ASSERT_THAT(LIBC_NAMESPACE::readlink("non-existent-link", buf, LEN),
  48               Fails(ENOENT));
  49 }