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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.
49TEST(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
77const char kHelloString[] = "Hello, world!";
78
79// Tests the c'tor that accepts a C string.
80TEST(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.
88TEST(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.
95TEST(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