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/unistd/readlink.h"
  12 #include "src/unistd/symlink.h"
  13 #include "src/unistd/unlink.h"
  14 #include "test/UnitTest/ErrnoSetterMatcher.h"
  15 #include "test/UnitTest/Test.h"
  16
  17 namespace cpp = LIBC_NAMESPACE::cpp;
  18
  19 TEST(LlvmLibcReadlinkTest, CreateAndUnlink) {
  20   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
  21   constexpr const char LINK_VAL[] = "readlink_test_value";
  22   constexpr const char LINK[] = "testdata/readlink.test.link";
  23   libc_errno = 0;
  24
  25   // The test strategy is as follows:
  26   //   1. Create a symlink with value LINK_VAL.
  27   //   2. Read the symlink with readlink. The link value read should be LINK_VAL
  28   //   3. Cleanup the symlink created in step #1.
  29   ASSERT_THAT(LIBC_NAMESPACE::symlink(LINK_VAL, LINK), Succeeds(0));
  30
  31   char buf[sizeof(LINK_VAL)];
  32   ssize_t len = LIBC_NAMESPACE::readlink(LINK, buf, sizeof(buf));
  33   ASSERT_EQ(libc_errno, 0);
  34   ASSERT_EQ(cpp::string_view(buf, len), cpp::string_view(LINK_VAL));
  35
  36   ASSERT_THAT(LIBC_NAMESPACE::unlink(LINK), Succeeds(0));
  37 }
  38
  39 TEST(LlvmLibcReadlinkTest, ReadlinkInNonExistentPath) {
  40   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
  41   char buf[8];
  42   ASSERT_THAT(LIBC_NAMESPACE::readlink("non-existent-link", buf, sizeof(buf)),
  43               Fails(ENOENT));
  44 }