1 //===- llvm/unittest/StringViewTest.cpp - StringView unit tests -----------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "llvm/Demangle/StringView.h"
10 #include "gtest/gtest.h"
11 
12 using namespace llvm;
13 using llvm::itanium_demangle::StringView;
14 
15 namespace llvm {
16 namespace itanium_demangle {
17 
18 std::ostream &operator<<(std::ostream &OS, const StringView &S) {
19   return OS.write(S.begin(), S.size());
20 }
21 
22 } // namespace itanium_demangle
23 } // namespace llvm
24 
25 TEST(StringViewTest, EmptyInitializerList) {
26   StringView S = {};
27   EXPECT_TRUE(S.empty());
28 
29   S = {};
30   EXPECT_TRUE(S.empty());
31 }
32 
33 TEST(StringViewTest, Substr) {
34   StringView S("abcdef");
35 
36   EXPECT_EQ("abcdef", S.substr(0));
37   EXPECT_EQ("f", S.substr(5));
38   EXPECT_EQ("", S.substr(6));
39 
40   EXPECT_EQ("", S.substr(0, 0));
41   EXPECT_EQ("a", S.substr(0, 1));
42   EXPECT_EQ("abcde", S.substr(0, 5));
43   EXPECT_EQ("abcdef", S.substr(0, 6));
44   EXPECT_EQ("abcdef", S.substr(0, 7));
45 
46   EXPECT_EQ("f", S.substr(5, 100));
47   EXPECT_EQ("", S.substr(6, 100));
48 }
49