public function testIncValue()
{
$variable = new Variable('a', 1, CompiledExpression::INTEGER);
static::assertSame(1, $variable->getValue());
$variable->inc();
static::assertSame(2, $variable->getValue());
$variable->inc();
static::assertSame(3, $variable->getValue());
$variable->inc();
$variable->inc();
static::assertSame(5, $variable->getValue());
}