libc/test/src/ctype/tolower_test.cpp

//===-- Unittests for tolower----------------------------------------------===//
//
// 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/ctype/tolower.h"
#include "utils/UnitTest/Test.h"

TEST(LlvmLibcToLower, DefaultLocale) {
  for (int ch = 0; ch < 255; ++ch) {
    // This follows pattern 'A' + 32 = 'a'.
    if ('A' <= ch && ch <= 'Z')
      EXPECT_EQ(__llvm_libc::tolower(ch), ch + 32);
    else
      EXPECT_EQ(__llvm_libc::tolower(ch), ch);
  }
}