Add unit tests for nl_types.

Author: vonosmas

libc/test/src/CMakeLists.txt

@@ -96,6 +96,7 @@ add_subdirectory(assert)
 add_subdirectory(compiler)
 add_subdirectory(dirent)
 add_subdirectory(locale)
+add_subdirectory(nl_types)
 add_subdirectory(signal)
 add_subdirectory(spawn)
 

libc/test/src/nl_types/CMakeLists.txt

@@ -0,0 +1,15 @@
+add_custom_target(libc-nl-types-tests)
+
+add_libc_test(
+  nl_types_test
+  SUITE
+    libc-nl-types-tests
+  SRCS
+    nl_types_test.cpp
+  DEPENDS
+    libc.include.llvm-libc-types.nl_catd
+    libc.src.nl_types.catopen
+    libc.src.nl_types.catclose
+    libc.src.nl_types.catgets
+)
+

libc/test/src/nl_types/nl_types_test.cpp

@@ -0,0 +1,33 @@
+//===-- Unittests for nl_types --------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "include/llvm-libc-types/nl_catd.h"
+#include "src/nl_types/catclose.h"
+#include "src/nl_types/catgets.h"
+#include "src/nl_types/catopen.h"
+#include "test/UnitTest/ErrnoCheckingTest.h"
+
+using LlvmLibcNlTypesTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
+
+TEST_F(LlvmLibcNlTypesTest, CatopenFails) {
+  ASSERT_EQ(LIBC_NAMESPACE::catopen("/somepath", 0),
+            reinterpret_cast<nl_catd>(-1));
+  ASSERT_ERRNO_EQ(EINVAL);
+}
+
+TEST_F(LlvmLibcNlTypesTest, CatcloseFails) {
+  ASSERT_EQ(LIBC_NAMESPACE::catclose(nullptr), -1);
+}
+
+TEST_F(LlvmLibcNlTypesTest, CatgetsFails) {
+  const char* message = "message";
+  // Note that we test for pointer equality here, since catgets
+  // is expected to return the input argument as-is.
+  ASSERT_EQ(LIBC_NAMESPACE::catgets(nullptr, 0, 0, message),
+            const_cast<char*>(message));
+}