TradeExecutorJUnit4Test

TradeExecutorJUnit4Test

package trp2.redonejunit4;


import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import org.junit.Test;

public class TradeExecutorJUnit4Test {

    @Test
    public void test_exception_for_null_trade_junit4_1() {

        //assemble
        TradeSender sender = trade -> false;
        TradeExecutor tradeExecutor = new TradeExecutor(sender);
        Trade nullTrade = null;

        //act
        try {
            tradeExecutor.executeTrade(nullTrade);
            fail("exception should have occurred");
        } catch (Exception e) {
            //assert
            assertTrue(e.getMessage().contains("Invalid trade"));
        }

    }

    @Test(expected = Exception.class)
    public void test_exception_for_null_trade_junit4_2() throws Exception {

        //assemble
        TradeSender sender = trade -> false;
        TradeExecutor tradeExecutor = new TradeExecutor(sender);
        Trade nullTrade = null;

        //act
        tradeExecutor.executeTrade(nullTrade);

        //assert
        fail("should not be here")
    }


}


interface TradeSender {
    boolean sendTrade(Trade trade);
}

class TradeExecutor {
    private TradeSender sender;

    public TradeExecutor(TradeSender sender) {
        this.sender = sender;
    }

    public boolean executeTrade(Trade trade) throws Exception {
        if (trade == null)
            throw new Exception("Invalid trade");

        if (trade.getQuantity() % 100 != 0)
            return false;

        return this.sender.sendTrade(trade);
    }
}

class Trade {
    public int getQuantity() {
        return 0;
    }

    public Security getSecurity() {
        return null;
    }

    public Account getAccount() {
        return null;
    }
}

class Account {
}

class Security {
}