1 /* 2 * Copyright (C) 2009 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "base/unix_file/null_file.h" 18 19 #include <errno.h> 20 21 #include "gtest/gtest.h" 22 23 namespace unix_file { 24 25 class NullFileTest : public testing::Test { }; 26 27 TEST_F(NullFileTest, Read) { 28 NullFile f; 29 char buf[256]; 30 // You can't read a negative number of bytes... 31 ASSERT_EQ(-EINVAL, f.Read(buf, 0, -1)); 32 // ...but everything else is fine (though you'll get no data). 33 ASSERT_EQ(0, f.Read(buf, 128, 0)); 34 ASSERT_EQ(0, f.Read(buf, 128, 128)); 35 } 36 37 TEST_F(NullFileTest, SetLength) { 38 NullFile f; 39 // You can't set a negative length... 40 ASSERT_EQ(-EINVAL, f.SetLength(-1)); 41 // ...but everything else is fine. 42 ASSERT_EQ(0, f.SetLength(0)); 43 ASSERT_EQ(0, f.SetLength(128)); 44 } 45 46 TEST_F(NullFileTest, GetLength) { 47 const std::string content("hello"); 48 NullFile f; 49 // The length is always 0. 50 ASSERT_EQ(0, f.GetLength()); 51 ASSERT_EQ(content.size(), static_cast<uint64_t>(f.Write(content.data(), content.size(), 0))); 52 ASSERT_EQ(0, f.GetLength()); 53 } 54 55 TEST_F(NullFileTest, Write) { 56 const std::string content("hello"); 57 NullFile f; 58 // You can't write at a negative offset... 59 ASSERT_EQ(-EINVAL, f.Write(content.data(), content.size(), -128)); 60 // But you can write anywhere else... 61 ASSERT_EQ(content.size(), static_cast<uint64_t>(f.Write(content.data(), content.size(), 0))); 62 ASSERT_EQ(content.size(), static_cast<uint64_t>(f.Write(content.data(), content.size(), 128))); 63 // ...though the file will remain empty. 64 ASSERT_EQ(0, f.GetLength()); 65 } 66 67 } // namespace unix_file 68
