ceph/src/jaegertracing/opentelemetry-cpp/third_party/prometheus-cpp/3rdparty/googletest/googletest/samples/sample2_unittest.cc

   1 // Copyright 2005, Google Inc.
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  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(nullptr, 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(nullptr);
 105   EXPECT_STREQ(nullptr, s.c_string());
 106 }
 107 }  // namespace