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  1. // Copyright 2005, Google Inc.
  2. // All rights reserved.
  3. //
  4. // Redistribution and use in source and binary forms, with or without
  5. // modification, are permitted provided that the following conditions are
  6. // met:
  7. //
  8. //     * Redistributions of source code must retain the above copyright
  9. // notice, this list of conditions and the following disclaimer.
  10. //     * Redistributions in binary form must reproduce the above
  11. // copyright notice, this list of conditions and the following disclaimer
  12. // in the documentation and/or other materials provided with the
  13. // distribution.
  14. //     * Neither the name of Google Inc. nor the names of its
  15. // contributors may be used to endorse or promote products derived from
  16. // this software without specific prior written permission.
  17. //
  18. // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19. // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20. // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21. // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22. // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23. // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24. // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25. // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26. // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27. // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28. // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  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. #include "gtest/gtest.h"
  42. namespace {
  43. // In this example, we test the MyString class (a simple string).
  44.  
  45. // Tests the default c'tor.
  46. TEST(MyString, DefaultConstructor) {
  47.   const MyString s;
  48.  
  49.   // Asserts that s.c_string() returns NULL.
  50.   //
  51.   // <TechnicalDetails>
  52.   //
  53.   // If we write NULL instead of
  54.   //
  55.   //   static_cast<const char *>(NULL)
  56.   //
  57.   // in this assertion, it will generate a warning on gcc 3.4.  The
  58.   // reason is that EXPECT_EQ needs to know the types of its
  59.   // arguments in order to print them when it fails.  Since NULL is
  60.   // #defined as 0, the compiler will use the formatter function for
  61.   // int to print it.  However, gcc thinks that NULL should be used as
  62.   // a pointer, not an int, and therefore complains.
  63.   //
  64.   // The root of the problem is C++'s lack of distinction between the
  65.   // integer number 0 and the null pointer constant.  Unfortunately,
  66.   // we have to live with this fact.
  67.   //
  68.   // </TechnicalDetails>
  69.   EXPECT_STREQ(NULL, s.c_string());
  70.  
  71.   EXPECT_EQ(0u, s.Length());
  72. }
  73.  
  74. const char kHelloString[] = "Hello, world!";
  75.  
  76. // Tests the c'tor that accepts a C string.
  77. TEST(MyString, ConstructorFromCString) {
  78.   const MyString s(kHelloString);
  79.   EXPECT_EQ(0, strcmp(s.c_string(), kHelloString));
  80.   EXPECT_EQ(sizeof(kHelloString)/sizeof(kHelloString[0]) - 1,
  81.             s.Length());
  82. }
  83.  
  84. // Tests the copy c'tor.
  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.
  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(NULL);
  105.   EXPECT_STREQ(NULL, s.c_string());
  106. }
  107. }  // namespace
  108.