[libc][NFC] Use specific ASSERT macros to test errno (#79573)

This patch provides specific test macros to deal with `errno`.
This will help abstract away the differences between unit test and integration/hermetic tests in #79319.
In one case we use `libc_errno` which is a struct, in the other case we deal directly with `errno`.

1 files changed, 5 insertions, 5 deletions

diff --git a/libc/test/src/sys/stat/fchmod_test.cpp b/libc/test/src/sys/stat/fchmod_test.cpp
index 5a32b5c973db..a0a93b03d22e 100644
--- a/libc/test/src/sys/stat/fchmod_test.cpp
+++ b/libc/test/src/sys/stat/fchmod_test.cpp
@@ -32,25 +32,25 @@ TEST(LlvmLibcChmodTest, ChangeAndOpen) {
 
   int fd = LIBC_NAMESPACE::open(TEST_FILE, O_APPEND | O_WRONLY);
   ASSERT_GT(fd, 0);
-  ASSERT_EQ(libc_errno, 0);
+  ASSERT_ERRNO_SUCCESS();
   ASSERT_EQ(LIBC_NAMESPACE::write(fd, WRITE_DATA, sizeof(WRITE_DATA)),
             WRITE_SIZE);
   ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
 
   fd = LIBC_NAMESPACE::open(TEST_FILE, O_APPEND | O_WRONLY);
   ASSERT_GT(fd, 0);
-  ASSERT_EQ(libc_errno, 0);
+  ASSERT_ERRNO_SUCCESS();
   EXPECT_THAT(LIBC_NAMESPACE::fchmod(fd, S_IRUSR), Succeeds(0));
   ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
 
   // Opening for writing should fail.
   EXPECT_EQ(LIBC_NAMESPACE::open(TEST_FILE, O_APPEND | O_WRONLY), -1);
-  EXPECT_NE(libc_errno, 0);
+  ASSERT_ERRNO_FAILURE();
   libc_errno = 0;
   // But opening for reading should succeed.
   fd = LIBC_NAMESPACE::open(TEST_FILE, O_APPEND | O_RDONLY);
   EXPECT_GT(fd, 0);
-  EXPECT_EQ(libc_errno, 0);
+  ASSERT_ERRNO_SUCCESS();
 
   EXPECT_THAT(LIBC_NAMESPACE::fchmod(fd, S_IRWXU), Succeeds(0));
   EXPECT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
@@ -59,6 +59,6 @@ TEST(LlvmLibcChmodTest, ChangeAndOpen) {
 TEST(LlvmLibcChmodTest, NonExistentFile) {
   libc_errno = 0;
   ASSERT_EQ(LIBC_NAMESPACE::fchmod(-1, S_IRUSR), -1);
-  ASSERT_NE(libc_errno, 0);
+  ASSERT_ERRNO_FAILURE();
   libc_errno = 0;
 }