LoslegenKostenlos loslegen

Unit test: Foreign exchange exceptions

One possible error scenario for the exchange app is the bank server being unavailable due to an outage or network issues. To ensure against disruptive exceptions, you have coded in a try/catch inside the convertEuroTo method.

Simulate the error scenario by making the mock EuropeanCentralBankServer object throw an exception when a rate is requested.

Diese Übung ist Teil des Kurses

Introduction to Testing in Java

Kurs anzeigen

Anleitung zur Übung

  • Make the mock bank object throw an exception when getRateEuroTo is called.
  • Create the exact exception object you want to simulate.
  • Verify the convertEuroTo method does not throw an exception but returns -1 in this scenario.

Interaktive Übung

Vervollständige den Beispielcode, um diese Übung erfolgreich abzuschließen.

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

class ExchangeAppTest {
    @Test
    void convertEuroTo_throwsException_whenBankUnavailable() {
        EuropeanCentralBankServer bank = mock(EuropeanCentralBankServer.class);
        ExchangeApp exchangeApp = new ExchangeApp(bank);
        double euroAmount = 450;
        // Stub the mock to throw an exception
        when(exchangeApp.convertEuroTo("TST", 100)).____(new ____("Bank server is unavailable."));
        
        double tstAmount = exchangeApp.convertEuroTo("TST", euroAmount);

		// Assert on the return value of the method
		____(____, ____);
    }
}
Code bearbeiten und ausführen