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29
30 // A sample program demonstrating using Google C++ testing framework.
31
32 // This sample shows how to write a more complex unit test for a class
33 // that has multiple member functions.
34 //
35 // Usually, it's a good idea to have one test for each method in your
36 // class. You don't have to do that exactly, but it helps to keep
37 // your tests organized. You may also throw in additional tests as
38 // needed.
39
40 #include "sample2.h"
41
42 #include "gtest/gtest.h"
43 namespace {
44 // In this example, we test the MyString class (a simple string).
45
46 // Tests the default c'tor.
TEST(MyString,DefaultConstructor)47 TEST(MyString, DefaultConstructor) {
48 const MyString s;
49
50 // Asserts that s.c_string() returns NULL.
51 //
52 // <TechnicalDetails>
53 //
54 // If we write NULL instead of
55 //
56 // static_cast<const char *>(NULL)
57 //
58 // in this assertion, it will generate a warning on gcc 3.4. The
59 // reason is that EXPECT_EQ needs to know the types of its
60 // arguments in order to print them when it fails. Since NULL is
61 // #defined as 0, the compiler will use the formatter function for
62 // int to print it. However, gcc thinks that NULL should be used as
63 // a pointer, not an int, and therefore complains.
64 //
65 // The root of the problem is C++'s lack of distinction between the
66 // integer number 0 and the null pointer constant. Unfortunately,
67 // we have to live with this fact.
68 //
69 // </TechnicalDetails>
70 EXPECT_STREQ(nullptr, s.c_string());
71
72 EXPECT_EQ(0u, s.Length());
73 }
74
75 const char kHelloString[] = "Hello, world!";
76
77 // Tests the c'tor that accepts a C string.
TEST(MyString,ConstructorFromCString)78 TEST(MyString, ConstructorFromCString) {
79 const MyString s(kHelloString);
80 EXPECT_EQ(0, strcmp(s.c_string(), kHelloString));
81 EXPECT_EQ(sizeof(kHelloString) / sizeof(kHelloString[0]) - 1, s.Length());
82 }
83
84 // Tests the copy c'tor.
TEST(MyString,CopyConstructor)85 TEST(MyString, CopyConstructor) {
86 const MyString s1(kHelloString);
87 const MyString s2 = s1;
88 EXPECT_EQ(0, strcmp(s2.c_string(), kHelloString));
89 }
90
91 // Tests the Set method.
TEST(MyString,Set)92 TEST(MyString, Set) {
93 MyString s;
94
95 s.Set(kHelloString);
96 EXPECT_EQ(0, strcmp(s.c_string(), kHelloString));
97
98 // Set should work when the input pointer is the same as the one
99 // already in the MyString object.
100 s.Set(s.c_string());
101 EXPECT_EQ(0, strcmp(s.c_string(), kHelloString));
102
103 // Can we set the MyString to NULL?
104 s.Set(nullptr);
105 EXPECT_STREQ(nullptr, s.c_string());
106 }
107 } // namespace
108