CppUnitでC++の例外をテストする方法

cd /usr/ports/devel/cppunit/
sudo make install clean

kcrypt.h
テストしたいソースコード。

#ifndef KCRYPT_H
#  define KCRYPT_H

#include <exception>
#include <stdexcept>
#include <string>
using namespace std;

class kcrypt
{
private:
	void isEmpty (const string str, const string name) {
		if (str.empty () ) {
			throw invalid_argument (name + " is empty.");
		}
	}
public:
	kcrypt () {}
	~kcrypt () {}
	void encrypt (const string secret, const string data, string &compute) {
		this->isEmpty (secret, "secret");
		this->isEmpty (data, "data");
		compute = "fake";
	}
};

#endif /* KCRYPT_H */

#ifndef TEST_H
#  define TEST_H
#include <cppunit/TestCase.h>
#include <cppunit/extensions/HelperMacros.h>
#include <cppunit/ui/text/TestRunner.h>

#include "kcrypt.h"

class kcryptTest : public CppUnit::TestFixture {

	CPPUNIT_TEST_SUITE ( kcryptTest );
	CPPUNIT_TEST ( test_encrypt_data );
	CPPUNIT_TEST ( test_encrypt_secret );
	CPPUNIT_TEST_SUITE_END ();
public:
	void test_encrypt_secret ();
	void test_encrypt_data ();

	void setUp () {
		target = new kcrypt;
	}
	void tearDown () {
		delete target;
	}

	void runTest () {
	}
private:
	kcrypt *target;
};

#endif /* TEST_H */

#include <iostream>
#include <cstdlib>

#include <cppunit/ui/text/TestRunner.h>
#include "test.h"

int
main (int argc, char *argv[])
{
	CppUnit::TestSuite *suite = kcryptTest::suite ();
	CppUnit::TextUi::TestRunner runner;
	runner.addTest (suite);
	bool retcode = runner.run ();
	return (! retcode);
}

#include <iostream>
#include <cstdlib>
#include "test.h"
using namespace std;

void
kcryptTest::test_encrypt_secret ()
{
	try {
		string compute;
		target->encrypt ("", "data", compute);
		CPPUNIT_FAIL ("The exception std::invalid_argument must be throw." );
	} catch (invalid_argument &e) {
		CPPUNIT_ASSERT (true);
	}
}
void
kcryptTest::test_encrypt_data ()
{
	try {
		string compute;
		target->encrypt ("secret", "", compute);
		CPPUNIT_FAIL ("The exception std::invalid_argument must be throw." );
	} catch (invalid_argument &e) {
		CPPUNIT_ASSERT (true);
	}
}

g++ -I/usr/local/include -L/usr/local/lib -lcppunit main.cc testKcrypt.cc

でもいいけど、 cppunikt-configを使った方がいいかも。

g++ `cppunit-config --cflags` `cppunit-config --libs` main.cc testKcrypt.cc

問題ないときの実行例

% ./a.out
..


OK (2 tests)

..F


!!!FAILURES!!!
Test Results:
Run:  2   Failures: 1   Errors: 0


1) test: kcryptTest::test_encrypt_secret (F) line: 14 testKcrypt.cc
forced failure
- The exception std::invalid_argument must be throw.