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Java Unit Testing in Java What to Test Happy Path Exception

Can you please write a happy path test for us in the CreditorTest fixture using the expected element for the @Test?

I don't understand what the question is asking for. I can call the "deduct" function. What is it talking about?

com/teamtreehouse/vending/CreditorTest.java
package com.teamtreehouse.vending;

import org.junit.Before;
import org.junit.Test;

import static org.junit.Assert.*;

public class CreditorTest {

    private Creditor creditor;

    @Before
    public void setUp() throws Exception {
        creditor = new Creditor();
    }
    @Test
    public void addingFundsIncrementsAvailableFunds() throws Exception {
        creditor.addFunds(25);
        creditor.addFunds(25);

        assertEquals(50, creditor.getAvailableFunds());
    }

    @Test
    public void refundingReturnsAllAvailableFunds() throws Exception {
        creditor.addFunds(10);

        int refund = creditor.refund();

        assertEquals(10, refund);
    }

    @Test
    public void refundingResetsAvailableFundsToZero() throws Exception {
        creditor.addFunds(10);

        creditor.refund();

        assertEquals(0, creditor.getAvailableFunds());
    }
    @Test
  public void happyPath() throws Exception {
  creditor.deduct(10);
  }

}
com/teamtreehouse/vending/Creditor.java
package com.teamtreehouse.vending;

public class Creditor {
    private int funds;

    public Creditor() {
        funds = 0;
    }

    public void addFunds(int money) {
        funds += money;
    }

    public void deduct(int money) throws NotEnoughFundsException {
        if (money > funds) {
            throw new NotEnoughFundsException();
        }
        funds -= money;
    }

    public int refund() {
        int refund = funds;
        funds = 0;
        return refund;
    }

    public int getAvailableFunds() {
        return funds;
    }

}
com/teamtreehouse/vending/NotEnoughFundsException.java
package com.teamtreehouse.vending;

public class NotEnoughFundsException extends Exception {
}

2 Answers

Ah, I found it. Just needed to apply the (expected = ...) after @Test

Kristopher Sanchez
Kristopher Sanchez
2,315 Points

I don't understand any of this. can anyone help?

I don't understand the purpose of the "happy path" test. Is it not just to call the "deduct" function? What else is it asking for? Take a look at the deduct method in the Creditor class. Pay attention to the NotEnoughFundsException that is thrown.

Can you please write a happy path test for us in the CreditorTest fixture using the expected element (parameter) for the @Test annotation? Thanks!