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// Copyright 2013 by Martin Moene
//
// lest is based on ideas by Kevlin Henney, see video at
// http://skillsmatter.com/podcast/agile-testing/kevlin-henney-rethinking-unit-testing-in-c-plus-plus
//
// Distributed under the Boost Software License, Version 1.0:
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
#ifndef LEST_LEST_H_INCLUDED
#define LEST_LEST_H_INCLUDED
#include <functional>
#include <iostream>
#include <stdexcept>
#include <string>
#include <cstddef>
#ifndef lest_NO_SHORT_ASSERTION_NAMES
# define EXPECT lest_EXPECT
# define EXPECT_THROWS lest_EXPECT_THROWS
# define EXPECT_THROWS_AS lest_EXPECT_THROWS_AS
#endif
#define lest_EXPECT( expr ) \
try \
{ \
if ( ! (expr) ) \
throw lest::failure{ lest_LOCATION, #expr }; \
} \
catch( lest::failure const & ) \
{ \
throw ; \
} \
catch( std::exception const & e ) \
{ \
throw lest::unexpected{ lest_LOCATION, #expr, lest::with_message( e.what() ) }; \
} \
catch(...) \
{ \
throw lest::unexpected{ lest_LOCATION, #expr, "of unknown type" }; \
}
#define lest_EXPECT_THROWS( expr ) \
for (;;) \
{ \
try { lest::serum( expr ); } catch (...) { break; } \
throw lest::expected{ lest_LOCATION, #expr }; \
}
#define lest_EXPECT_THROWS_AS( expr, excpt ) \
for (;;) \
{ \
try { lest::serum( expr ); } catch ( excpt & ) { break; } catch (...) {} \
throw lest::expected{ lest_LOCATION, #expr, lest::of_type( #excpt ) }; \
}
#define lest_LOCATION lest::location{__FILE__, __LINE__}
namespace lest {
struct test
{
const std::string name;
const std::function<void()> behaviour;
};
struct location
{
const std::string file;
const int line;
location( std::string file, int line )
: file{ file }, line{ line } {}
};
struct comment
{
const std::string text;
comment( std::string text ) : text{ text } {}
explicit operator bool() { return ! text.empty(); }
};
struct message : std::runtime_error
{
const std::string kind;
const location where;
const comment note;
~message() throw() {} // GCC 4.6
message( std::string kind, location where, std::string expr, std::string note = "" )
: std::runtime_error{ expr }, kind{ kind }, where{ where }, note{ note } {}
};
struct failure : message
{
failure( location where, std::string expr )
: message{ "failed", where, expr } {}
};
struct expected : message
{
expected( location where, std::string expr, std::string excpt = "" )
: message{ "failed: didn't get exception", where, expr, excpt } {}
};
struct unexpected : message
{
unexpected( location where, std::string expr, std::string note )
: message{ "failed: got unexpected exception", where, expr, note } {}
};
inline bool serum( bool verum ) { return verum; }
inline std::string with_message( std::string text )
{
return "with message \"" + text + "\"";
}
inline std::string of_type( std::string text )
{
return "of type " + text;
}
inline std::string pluralise( int n, std::string text )
{
return n == 1 ? text : text + "s";
}
inline std::ostream & operator<<( std::ostream & os, comment note )
{
return os << (note ? " " + note.text : "" );
}
inline std::ostream & operator<<( std::ostream & os, location where )
{
#ifdef __GNUG__
return os << where.file << ":" << where.line;
#else
return os << where.file << "(" << where.line << ")";
#endif
}
inline void report( std::ostream & os, message const & e, std::string test )
{
os << e.where << ": " << e.kind << e.note << ": " << test << ": " << e.what() << std::endl;
}
template<std::size_t N>
int run( test const (&specification)[N], std::ostream & os = std::cout )
{
int failures = 0;
for ( auto & testing : specification )
{
try
{
testing.behaviour();
}
catch( message const & e )
{
++failures;
report( os, e, testing.name );
}
}
if ( failures > 0 )
{
os << failures << " out of " << N << " " << pluralise(N, "test") << " failed." << std::endl;
}
return failures;
}
} // namespace lest
#endif // LEST_LEST_H_INCLUDED
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