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dynamicbitset/gtest-1.7.0/samples/sample2_unittest.cc
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// A sample program demonstrating using Google C++ testing framework. | |
// | |
// Author: wan@google.com (Zhanyong Wan) | |
// This sample shows how to write a more complex unit test for a class | |
// that has multiple member functions. | |
// | |
// Usually, it's a good idea to have one test for each method in your | |
// class. You don't have to do that exactly, but it helps to keep | |
// your tests organized. You may also throw in additional tests as | |
// needed. | |
#include "sample2.h" | |
#include "gtest/gtest.h" | |
// In this example, we test the MyString class (a simple string). | |
// Tests the default c'tor. | |
TEST(MyString, DefaultConstructor) { | |
const MyString s; | |
// Asserts that s.c_string() returns NULL. | |
// | |
// <TechnicalDetails> | |
// | |
// If we write NULL instead of | |
// | |
// static_cast<const char *>(NULL) | |
// | |
// in this assertion, it will generate a warning on gcc 3.4. The | |
// reason is that EXPECT_EQ needs to know the types of its | |
// arguments in order to print them when it fails. Since NULL is | |
// #defined as 0, the compiler will use the formatter function for | |
// int to print it. However, gcc thinks that NULL should be used as | |
// a pointer, not an int, and therefore complains. | |
// | |
// The root of the problem is C++'s lack of distinction between the | |
// integer number 0 and the null pointer constant. Unfortunately, | |
// we have to live with this fact. | |
// | |
// </TechnicalDetails> | |
EXPECT_STREQ(NULL, s.c_string()); | |
EXPECT_EQ(0u, s.Length()); | |
} | |
const char kHelloString[] = "Hello, world!"; | |
// Tests the c'tor that accepts a C string. | |
TEST(MyString, ConstructorFromCString) { | |
const MyString s(kHelloString); | |
EXPECT_EQ(0, strcmp(s.c_string(), kHelloString)); | |
EXPECT_EQ(sizeof(kHelloString)/sizeof(kHelloString[0]) - 1, | |
s.Length()); | |
} | |
// Tests the copy c'tor. | |
TEST(MyString, CopyConstructor) { | |
const MyString s1(kHelloString); | |
const MyString s2 = s1; | |
EXPECT_EQ(0, strcmp(s2.c_string(), kHelloString)); | |
} | |
// Tests the Set method. | |
TEST(MyString, Set) { | |
MyString s; | |
s.Set(kHelloString); | |
EXPECT_EQ(0, strcmp(s.c_string(), kHelloString)); | |
// Set should work when the input pointer is the same as the one | |
// already in the MyString object. | |
s.Set(s.c_string()); | |
EXPECT_EQ(0, strcmp(s.c_string(), kHelloString)); | |
// Can we set the MyString to NULL? | |
s.Set(NULL); | |
EXPECT_STREQ(NULL, s.c_string()); | |
} |