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sample2_unittest.cc
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29 
30 // A sample program demonstrating using Google C++ testing framework.
31 //
32 // Author: wan@google.com (Zhanyong Wan)
33 
34 
35 // This sample shows how to write a more complex unit test for a class
36 // that has multiple member functions.
37 //
38 // Usually, it's a good idea to have one test for each method in your
39 // class. You don't have to do that exactly, but it helps to keep
40 // your tests organized. You may also throw in additional tests as
41 // needed.
42 
43 #include "sample2.h"
44 #include "gtest/gtest.h"
45 
46 // In this example, we test the MyString class (a simple string).
47 
48 // Tests the default c'tor.
49 TEST(MyString, DefaultConstructor) {
50  const MyString s;
51 
52  // Asserts that s.c_string() returns NULL.
53  //
54  // <TechnicalDetails>
55  //
56  // If we write NULL instead of
57  //
58  // static_cast<const char *>(NULL)
59  //
60  // in this assertion, it will generate a warning on gcc 3.4. The
61  // reason is that EXPECT_EQ needs to know the types of its
62  // arguments in order to print them when it fails. Since NULL is
63  // #defined as 0, the compiler will use the formatter function for
64  // int to print it. However, gcc thinks that NULL should be used as
65  // a pointer, not an int, and therefore complains.
66  //
67  // The root of the problem is C++'s lack of distinction between the
68  // integer number 0 and the null pointer constant. Unfortunately,
69  // we have to live with this fact.
70  //
71  // </TechnicalDetails>
72  EXPECT_STREQ(NULL, s.c_string());
73 
74  EXPECT_EQ(0u, s.Length());
75 }
76 
77 const char kHelloString[] = "Hello, world!";
78 
79 // Tests the c'tor that accepts a C string.
80 TEST(MyString, ConstructorFromCString) {
81  const MyString s(kHelloString);
82  EXPECT_EQ(0, strcmp(s.c_string(), kHelloString));
83  EXPECT_EQ(sizeof(kHelloString)/sizeof(kHelloString[0]) - 1,
84  s.Length());
85 }
86 
87 // Tests the copy c'tor.
88 TEST(MyString, CopyConstructor) {
89  const MyString s1(kHelloString);
90  const MyString s2 = s1;
91  EXPECT_EQ(0, strcmp(s2.c_string(), kHelloString));
92 }
93 
94 // Tests the Set method.
96  MyString s;
97 
98  s.Set(kHelloString);
99  EXPECT_EQ(0, strcmp(s.c_string(), kHelloString));
100 
101  // Set should work when the input pointer is the same as the one
102  // already in the MyString object.
103  s.Set(s.c_string());
104  EXPECT_EQ(0, strcmp(s.c_string(), kHelloString));
105 
106  // Can we set the MyString to NULL?
107  s.Set(NULL);
108  EXPECT_STREQ(NULL, s.c_string());
109 }