Unit test: Foreign exchange market
Let's practice creating and programming mocks in the banking context! Complete the unit test for the ExchangeApp, which
uses the European Central Bank. As you're testing the convertEuroTo() logic, don't mock it. Instead, mock its dependency so that you can check if it works properly!
The necessary JUnit and Mockito packages have been imported for you.
Diese Übung ist Teil des Kurses
Introduction to Testing in Java
Anleitung zur Übung
- Create a mock for the
EuropeanCentralBankServer. - Use the correct syntax to program the mock to return
12345.0. - Verify the currency conversion returns the desired output.
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_convertsTST() {
// Create a mock object for the EuropeanCentralBankServer
EuropeanCentralBankServer bank = ____(EuropeanCentralBankServer.class);
ExchangeApp exchangeApp = new ExchangeApp(bank);
double euroAmount = 100;
// Stub the mock to return a value for given input
____(exchangeApp.convertEuroTo("TST", 100)).____(12345.0);
double tstAmount = exchangeApp.convertEuroTo("TST", euroAmount);
System.out.println("Converted " + euroAmount + " EUR to " + tstAmount + " TST.");
// Assert on the exact expected value of tstAmount
____(1234500, ____);
}
}