Foreign Exchange: Error scenario

The documentation for the EuropeanCentralBankServer library says that attempting to convert to currencies the bank doesn't offer will result in this exception:

new RuntimeException("Currency not in ECB list: " + currencyName)

Write an integration test that verifies this error scenario.

This exercise is part of the course

Introduction to Testing in Java

View Course

Exercise instructions

Fill in the correct assertion to verify the exception is an instance of RuntimeException.
Use the correct assertion to check equality.

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

import org.junit.jupiter.api.Test;
import com.datacamp.util.api.banking.EuropeanCentralBankServer;

import static com.datacamp.util.testing.CustomJUnitTestLauncher.launchTestsAndPrint;
import static org.junit.jupiter.api.Assertions.*;

class Main {
    public static void main(String[] args) {
        launchTestsAndPrint(ExchangeAppTest.class);
    }
}

class ExchangeApp {
    private EuropeanCentralBankServer bank;

    public ExchangeApp(EuropeanCentralBankServer bank) {
        this.bank = bank;
    }

    public double convertEuroTo(String currency, double amount) {
        double rate = this.bank.getRateEuroTo(currency);

        return amount * rate;
    }
}

class ExchangeAppTest {
    @Test
    void convert_throwsException_whenGetRateThrowsException() {
        EuropeanCentralBankServer bank = new EuropeanCentralBankServer();
        ExchangeApp exchangeApp = new ExchangeApp(bank);
        Exception expectedException = null;

        try {
            double result = exchangeApp.convertEuroTo("Invalid Currency", 1000);
        } catch (Exception e) {
        	expectedException = e;
        }
       	// Assert that the exception is an instance of the correct class
        ____(RuntimeException.class, expectedException);
        // Assert that the exception message is correct
        ____("Currency not in ECB list: Invalid Currency", expectedException.getMessage());
    }
}

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