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Java Unit Testing in Java How to Test Single Assertions Make For Better Tests

Joyce Chidiadi
Joyce Chidiadi
1,867 Points
Posted by Joyce Chidiadi
Joyce Chidiadi
1,867 Points

How can I break out the refundingReturnsAllAvailableFinds() in the exercise for Unit Testing in Java?

package com.teamtreehouse.vending;

import org.junit.Test;

import static org.junit.Assert.*;

public class CreditorTest {

@Test
public void addingFundsIncrementAvailableFunds() throws Exception{
    Creditor creditor = new Creditor();

    creditor.addFunds(25);
    creditor.addFunds(25);

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

@Test
public void refundingReturnsAllAvailableFinds() throws Exception{
    Creditor creditor = new Creditor();
    creditor.addFunds(10);

    int refund = creditor.refund();

    assertEquals(10, refund);
    assertEquals(0, creditor.getAvailableFunds());
}

}

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

import org.junit.Test;

import static org.junit.Assert.*;

public class CreditorTest {

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

        int refund = creditor.refund();

        assertEquals(10, refund);
        assertEquals(0, creditor.getAvailableFunds());
    }
}
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;
    }

}

1 Answer

Seth Kroger
Seth Kroger
56,414 Points
Seth Kroger
Seth Kroger
56,414 Points

It means to create a new test with the same Arrange and Act steps, but you'll move the second assertion into this new test. That way both tests only have one assertion.