/**
* This method computes the nth fibonacci number.
*
* @access public
* @static
* @param IInteger\Type $n the operand
* @return IInteger\Type the result
*/
public static function fibonacci(IInteger\Type $n) : IInteger\Type
{
return IInteger\Module::le($n, IInteger\Type::one())->unbox() ? $n : IInteger\Module::add(IInteger\Module::fibonacci(IInteger\Module::decrement($n)), IInteger\Module::fibonacci(IInteger\Module::subtract($n, IInteger\Type::box('2'))));
}
/**
* This method tests the "fibonacci" method.
*
* @dataProvider data_fibonacci
*/
public function test_fibonacci(array $provided, array $expected)
{
$p0 = IInteger\Module::fibonacci(IInteger\Type::box($provided[0]));
$e0 = $expected[0];
$this->assertInstanceOf('\\Saber\\Data\\IInteger\\Type', $p0);
$this->assertSame($e0, $p0->unbox());
}
