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#ifndef guard_testing_counters_hpp
#define guard_testing_counters_hpp
/**
* @file
*
* @brief Some unit tests need to count how many times a function is
* called. Here we implement some simple helper classes for that
* purpose.
*
* $Id$
*
* @author Carlos O'Ryan
*/
#include "testing_exception.hpp"
#include <boost/utility.hpp>
#include <iostream>
/**
* @brief Used to count how many times a function gets called. The
* unit test should create one instance per function.
*/
class call_counter
{
public:
inline call_counter()
: count_(0)
, failure_countdown_(0)
{}
inline long current_count() const
{
return count_;
}
inline void failure_countdown(long countdown)
{
failure_countdown_ = countdown;
}
inline void operator()()
{
++count_;
if (--failure_countdown_ == 0)
{
throw testing_exception();
}
}
private:
long count_;
long failure_countdown_;
};
/**
* @brief Used to detect if a testing_counter is "called" the right
* number of times.
*/
class expected_calls
: private boost::noncopyable
{
public:
inline expected_calls(call_counter const & counter)
: current_count_(counter.current_count())
, previous_count_(counter.current_count())
, counter_(counter)
{ }
inline bool expect(long n)
{
reset();
return (previous_count_ + n == current_count_);
}
inline void reset()
{
previous_count_ = current_count_;
current_count_ = counter_.current_count();
}
inline long current_count() const
{
return current_count_;
}
inline long previous_count() const
{
return previous_count_;
}
private:
long current_count_;
long previous_count_;
call_counter const & counter_;
};
inline std::ostream & operator<<(std::ostream & os, expected_calls const & x)
{
return os << "current=" << x.current_count()
<< ",previous=" << x.previous_count();
}
#endif // guard_testing_counters_hpp
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