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
TEST_F(NullFileTest,Read)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
TEST_F(NullFileTest,SetLength)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
TEST_F(NullFileTest,GetLength)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
TEST_F(NullFileTest,Write)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