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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.
TEST(MyString,DefaultConstructor)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.
TEST(MyString,ConstructorFromCString)80 TEST(MyString, ConstructorFromCString) {
81 const MyString s(kHelloString);
82 EXPECT_TRUE(strcmp(s.c_string(), kHelloString) == 0);
83 EXPECT_EQ(sizeof(kHelloString)/sizeof(kHelloString[0]) - 1,
84 s.Length());
85 }
86
87 // Tests the copy c'tor.
TEST(MyString,CopyConstructor)88 TEST(MyString, CopyConstructor) {
89 const MyString s1(kHelloString);
90 const MyString s2 = s1;
91 EXPECT_TRUE(strcmp(s2.c_string(), kHelloString) == 0);
92 }
93
94 // Tests the Set method.
TEST(MyString,Set)95 TEST(MyString, Set) {
96 MyString s;
97
98 s.Set(kHelloString);
99 EXPECT_TRUE(strcmp(s.c_string(), kHelloString) == 0);
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_TRUE(strcmp(s.c_string(), kHelloString) == 0);
105
106 // Can we set the MyString to NULL?
107 s.Set(NULL);
108 EXPECT_STREQ(NULL, s.c_string());
109 }
110