mql-rust/src/engine/tests.rs

#[cfg(test)]
mod tests {
    use crate::compiler::lexer::Lexer;
    use crate::compiler::lexer::Token;
    use crate::engine::backtester::{Backtester, BacktestConfig, OrderType};

    #[test]
    fn test_mql5_lexer() {
        let code = r#"
            double input lotSize = 0.1;
            void OnTick() {
                OrderSend("EURUSD", OP_BUY, lotSize, Ask, 10, 0, 0);
            }
        "#;
        
        // This is just a structural test that the lexer doesn't panic and returns tokens
        let result = Lexer::tokenize(code);
        assert!(result.is_ok());
        
        let (_, tokens) = result.unwrap();
        assert!(!tokens.is_empty());
        assert!(tokens.contains(&Token::Double));
        assert!(tokens.contains(&Token::Input));
        assert!(tokens.contains(&Token::Identifier("lotSize".to_string())));
    }
    
    #[test]
    fn test_backtest_engine_equity() {
        let config = BacktestConfig {
            initial_deposit: 10000.0,
            leverage: 100.0,
            spread_modifier: 0,
        };
        
        let mut bt = Backtester::new(config);
        
        // Simulate feed: Bid=1.00000, Ask=1.00010
        bt.update_tick("EURUSD", 1.00000, 1.00010);
        
        let ticket = bt.market_order("EURUSD", OrderType::Buy, 1.0, None, None, "10:00".to_string()).unwrap();
        
        // Price goes up 10 pips: Bid=1.00100, Ask=1.00110
        bt.update_tick("EURUSD", 1.00100, 1.00110);
        
        // We bought at Ask (1.00010), current Bid is 1.00100. Diff = +0.00090
        // Profit = 0.00090 * 100000 * 1.0 = $90.00
        assert!(bt.equity > 10080.0 && bt.equity < 10100.0); 
        
        // Close position
        bt.close_position(ticket, "10:05".to_string()).unwrap();
        assert!(bt.balance > 10080.0 && bt.balance < 10100.0);
        assert_eq!(bt.open_positions.len(), 0);
        assert_eq!(bt.history.len(), 1);
    }
}