[libc] Move all tests to a top level `test` directory.

A toplevel target, `check-libc` has also been added.

Reviewers: abrachet, phosek

Tags: #libc-project

Differential Revision: https://reviews.llvm.org/D72177

9 files changed, 193 insertions, 0 deletions

diff --git a/libc/test/src/CMakeLists.txt b/libc/test/src/CMakeLists.txt
new file mode 100644
index 00000000000..daf0f1ce57c
--- /dev/null
+++ b/libc/test/src/CMakeLists.txt
@@ -0,0 +1,3 @@
+add_subdirectory(errno)
+add_subdirectory(string)
+add_subdirectory(sys)
diff --git a/libc/test/src/errno/CMakeLists.txt b/libc/test/src/errno/CMakeLists.txt
new file mode 100644
index 00000000000..6c21da5701b
--- /dev/null
+++ b/libc/test/src/errno/CMakeLists.txt
@@ -0,0 +1,12 @@
+add_custom_target(libc_errno_unittests)
+add_dependencies(check_libc libc_errno_unittests)
+
+add_libc_unittest(
+  errno_test
+  SUITE
+    libc_errno_unittests
+  SRCS
+    errno_test.cpp
+  DEPENDS
+    __errno_location
+)
diff --git a/libc/test/src/errno/errno_test.cpp b/libc/test/src/errno/errno_test.cpp
new file mode 100644
index 00000000000..1ca61d5c625
--- /dev/null
+++ b/libc/test/src/errno/errno_test.cpp
@@ -0,0 +1,17 @@
+//===---------------------- Unittests for errno --------------------------===//
+//
+// 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 "src/errno/llvmlibc_errno.h"
+
+#include "gtest/gtest.h"
+
+TEST(ErrnoTest, Basic) {
+  int test_val = 123;
+  llvmlibc_errno = test_val;
+  ASSERT_EQ(test_val, llvmlibc_errno);
+}
diff --git a/libc/test/src/string/CMakeLists.txt b/libc/test/src/string/CMakeLists.txt
new file mode 100644
index 00000000000..bc5c088d169
--- /dev/null
+++ b/libc/test/src/string/CMakeLists.txt
@@ -0,0 +1,23 @@
+add_custom_target(libc_string_unittests)
+add_dependencies(check_libc libc_string_unittests)
+
+add_libc_unittest(
+  strcat_test
+  SUITE
+    libc_string_unittests
+  SRCS
+    strcat_test.cpp
+  DEPENDS
+    strcat
+    strcpy
+)
+
+add_libc_unittest(
+  strcpy_test
+  SUITE
+    libc_string_unittests
+  SRCS
+    strcpy_test.cpp
+  DEPENDS
+    strcpy
+)
diff --git a/libc/test/src/string/strcat_test.cpp b/libc/test/src/string/strcat_test.cpp
new file mode 100644
index 00000000000..3b8a7a7e447
--- /dev/null
+++ b/libc/test/src/string/strcat_test.cpp
@@ -0,0 +1,39 @@
+//===---------------------- Unittests for strcat --------------------------===//
+//
+// 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 <string>
+
+#include "src/string/strcat/strcat.h"
+#include "gtest/gtest.h"
+
+TEST(StrCatTest, EmptyDest) {
+  std::string abc = "abc";
+  char dest[4];
+
+  dest[0] = '\0';
+
+  char *result = __llvm_libc::strcat(dest, abc.c_str());
+  ASSERT_EQ(dest, result);
+  ASSERT_EQ(std::string(dest), abc);
+  ASSERT_EQ(std::string(dest).size(), abc.size());
+}
+
+TEST(StrCatTest, NonEmptyDest) {
+  std::string abc = "abc";
+  char dest[7];
+
+  dest[0] = 'x';
+  dest[1] = 'y';
+  dest[2] = 'z';
+  dest[3] = '\0';
+
+  char *result = __llvm_libc::strcat(dest, abc.c_str());
+  ASSERT_EQ(dest, result);
+  ASSERT_EQ(std::string(dest), std::string("xyz") + abc);
+  ASSERT_EQ(std::string(dest).size(), abc.size() + 3);
+}
diff --git a/libc/test/src/string/strcpy_test.cpp b/libc/test/src/string/strcpy_test.cpp
new file mode 100644
index 00000000000..e68ea5103db
--- /dev/null
+++ b/libc/test/src/string/strcpy_test.cpp
@@ -0,0 +1,36 @@
+//===----------------------- Unittests for strcpy -------------------------===//
+//
+// 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 <string>
+
+#include "src/string/strcpy/strcpy.h"
+#include "gtest/gtest.h"
+
+TEST(StrCpyTest, EmptyDest) {
+  std::string abc = "abc";
+  char dest[4];
+
+  char *result = __llvm_libc::strcpy(dest, abc.c_str());
+  ASSERT_EQ(dest, result);
+  ASSERT_EQ(std::string(dest), abc);
+  ASSERT_EQ(std::string(dest).size(), abc.size());
+}
+
+TEST(StrCpyTest, OffsetDest) {
+  std::string abc = "abc";
+  char dest[7];
+
+  dest[0] = 'x';
+  dest[1] = 'y';
+  dest[2] = 'z';
+
+  char *result = __llvm_libc::strcpy(dest + 3, abc.c_str());
+  ASSERT_EQ(dest + 3, result);
+  ASSERT_EQ(std::string(dest), std::string("xyz") + abc);
+  ASSERT_EQ(std::string(dest).size(), abc.size() + 3);
+}
diff --git a/libc/test/src/sys/CMakeLists.txt b/libc/test/src/sys/CMakeLists.txt
new file mode 100644
index 00000000000..03c59bfc4a0
--- /dev/null
+++ b/libc/test/src/sys/CMakeLists.txt
@@ -0,0 +1 @@
+add_subdirectory(mman)
diff --git a/libc/test/src/sys/mman/CMakeLists.txt b/libc/test/src/sys/mman/CMakeLists.txt
new file mode 100644
index 00000000000..3e153eb1134
--- /dev/null
+++ b/libc/test/src/sys/mman/CMakeLists.txt
@@ -0,0 +1,14 @@
+add_custom_target(libc_sys_mman_unittests)
+add_dependencies(check_libc libc_sys_mman_unittests)
+
+add_libc_unittest(
+  mmap_test
+  SUITE
+    libc_sys_mman_unittests
+  SRCS
+    mmap_test.cpp
+  DEPENDS
+    mmap
+    munmap
+    __errno_location
+)
diff --git a/libc/test/src/sys/mman/mmap_test.cpp b/libc/test/src/sys/mman/mmap_test.cpp
new file mode 100644
index 00000000000..ab2e6ceb4a9
--- /dev/null
+++ b/libc/test/src/sys/mman/mmap_test.cpp
@@ -0,0 +1,48 @@
+//===------------------ Unittests for mmap and munmap ---------------------===//
+//
+// 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 "src/errno/llvmlibc_errno.h"
+#include "src/sys/mman/mmap.h"
+#include "src/sys/mman/munmap.h"
+
+#include "gtest/gtest.h"
+
+#include "errno.h"
+#include "sys/mman.h"
+
+TEST(MMapTest, NoError) {
+  size_t alloc_size = 128;
+  llvmlibc_errno = 0;
+  void *addr = __llvm_libc::mmap(nullptr, alloc_size, PROT_READ,
+                                 MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+  EXPECT_EQ(0, llvmlibc_errno);
+  EXPECT_NE(addr, MAP_FAILED);
+
+  int *array = reinterpret_cast<int *>(addr);
+  // Reading from the memory should not crash the test.
+  // Since we used the MAP_ANONYMOUS flag, the contents of the newly
+  // allocated memory should be initialized to zero.
+  EXPECT_EQ(array[0], 0);
+
+  int ret_val = __llvm_libc::munmap(addr, alloc_size);
+  EXPECT_EQ(0, ret_val);
+  EXPECT_EQ(0, llvmlibc_errno);
+}
+
+TEST(MMapTest, Error_InvalidSize) {
+  llvmlibc_errno = 0;
+  void *addr = __llvm_libc::mmap(nullptr, 0, PROT_READ,
+                                 MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+  EXPECT_EQ(EINVAL, llvmlibc_errno);
+  EXPECT_EQ(addr, MAP_FAILED);
+
+  llvmlibc_errno = 0;
+  int ret_val = __llvm_libc::munmap(0, 0);
+  EXPECT_EQ(-1, ret_val);
+  EXPECT_EQ(EINVAL, llvmlibc_errno);
+}