errno_saver_test.cc (1444B)
1 // Copyright 2018 The Abseil Authors. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #include "absl/base/internal/errno_saver.h" 16 17 #include <cerrno> 18 19 #include "gmock/gmock.h" 20 #include "gtest/gtest.h" 21 #include "absl/base/internal/strerror.h" 22 23 namespace { 24 using ::testing::Eq; 25 26 struct ErrnoPrinter { 27 int no; 28 }; 29 std::ostream &operator<<(std::ostream &os, ErrnoPrinter ep) { 30 return os << absl::base_internal::StrError(ep.no) << " [" << ep.no << "]"; 31 } 32 bool operator==(ErrnoPrinter one, ErrnoPrinter two) { return one.no == two.no; } 33 34 TEST(ErrnoSaverTest, Works) { 35 errno = EDOM; 36 { 37 absl::base_internal::ErrnoSaver errno_saver; 38 EXPECT_THAT(ErrnoPrinter{errno}, Eq(ErrnoPrinter{EDOM})); 39 errno = ERANGE; 40 EXPECT_THAT(ErrnoPrinter{errno}, Eq(ErrnoPrinter{ERANGE})); 41 EXPECT_THAT(ErrnoPrinter{errno_saver()}, Eq(ErrnoPrinter{EDOM})); 42 } 43 EXPECT_THAT(ErrnoPrinter{errno}, Eq(ErrnoPrinter{EDOM})); 44 } 45 } // namespace