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sample2_unittest.cc
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R9484 sp4e-homework-lars-bertil
sample2_unittest.cc
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// Copyright 2005, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// 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
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