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// A sample program demonstrating using Google C++ testing framework.
// 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"
namespace {
// 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());
}
} // namespace