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     29 
     30 // A sample program demonstrating using Google C++ testing framework.
     31 //
     32 // Author: wan (at) 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(0, 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_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.
     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.
     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