crypto-pair 2.3.20

Parse exchange-specific symbols to unified format
Documentation 
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use crypto_market_type::MarketType;
use crypto_pair::{get_market_type, normalize_pair};

const EXCHANGE_NAME: &str = "bitfinex";

#[test]
fn verify_spot_symbols() {
    assert_eq!("BTC/USD".to_string(), normalize_pair("BTCUSD", EXCHANGE_NAME).unwrap());
    assert_eq!("BTC/USDT".to_string(), normalize_pair("BTCUST", EXCHANGE_NAME).unwrap());
    assert_eq!("BTC/USDT".to_string(), normalize_pair("tBTCUST", EXCHANGE_NAME).unwrap());

    assert_eq!(MarketType::Spot, get_market_type("BTCUSD", EXCHANGE_NAME, None));
    assert_eq!(MarketType::Spot, get_market_type("BTCUST", EXCHANGE_NAME, None));
    assert_eq!(MarketType::Spot, get_market_type("tBTCUST", EXCHANGE_NAME, None));
}

#[test]
fn verify_linear_swap_symbols() {
    assert_eq!("BTC/USDT".to_string(), normalize_pair("BTCF0:USTF0", EXCHANGE_NAME).unwrap());
    assert_eq!("BTC/USDT".to_string(), normalize_pair("tBTCF0:USTF0", EXCHANGE_NAME).unwrap());

    assert_eq!(MarketType::LinearSwap, get_market_type("BTCF0:USTF0", EXCHANGE_NAME, None));
    assert_eq!(MarketType::LinearSwap, get_market_type("tBTCF0:USTF0", EXCHANGE_NAME, None));
}