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Java Unit Testing in Java What to Test Exceptions

Posted by Codrin Postu
Codrin Postu
8,022 Points

[Solved] For me the Expected field doesn't work. I get the "cannot find symbol" error

Did anyone else encounter this?

Lauren Moineau
Lauren Moineau
9,483 Points

Hi Codrin. Could you copy/paste your code here, please? Without it, it's impossible to help you. Thanks :)

Codrin Postu
Codrin Postu
8,022 Points

Lauren Moineau here is the code. It is exactly the code from the video.

package com.teamtreehouse.vending;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.*;

class AlphaNumericChooserTest {

    private AlphaNumericChooser chooser;


    @BeforeEach
    void setUp() {
        chooser = new AlphaNumericChooser(26, 10);
    }


    @Test
    void validInputReturnsProperLocation() throws Exception {
        AlphaNumericChooser.Location loc = chooser.locationFromInput("B4");

        assertEquals(1, loc.getRow());
        assertEquals(3, loc.getColumn());
    }

    @Test (expected = InvalidLocationException.class)
    void choosingWrongInputIsNotAllowed() throws Exception {
        chooser.locationFromInput("WRONG");
    }
}
Lauren Moineau
Lauren Moineau
9,483 Points

Thanks

3 Answers

Miguel Nunez
Miguel Nunez
1,081 Points
Miguel Nunez
Miguel Nunez
1,081 Points

Oh, wow, it's a lambda! Cool.

Raymond Cool
Raymond Cool
5,171 Points
Raymond Cool
Raymond Cool
5,171 Points

This discussion was very helpful. UPVOTE

Lauren Moineau
Lauren Moineau
9,483 Points
Lauren Moineau
Lauren Moineau
9,483 Points

Thanks for posting your code Codrin. I haven't done that course yet but if I'm not mistaken I think JUnit 4 is used. In your code, your imports are for JUnit 5 Jupiter. It should be:

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

import static org.junit.Assert.*;

Hope that helps :)

Codrin Postu
Codrin Postu
8,022 Points

Yes I did realize I was using JUnit 5 but didn't think it would be too different from 4. Apparently the new version doesn't use "expected" and "rule" anymore.

For anyone else having this issue this is the solution I have found other than using JUnit 4:

package com.teamtreehouse.vending;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.*;

class AlphaNumericChooserTest {

    private AlphaNumericChooser chooser;
    private Throwable thrown;


    @BeforeEach
    void setUp() {
        chooser = new AlphaNumericChooser(26, 10);
    }


    @Test
    void validInputReturnsProperLocation() throws Exception {
        AlphaNumericChooser.Location loc = chooser.locationFromInput("B4");

        assertEquals(1, loc.getRow());
        assertEquals(3, loc.getColumn());
    }
    // The solution for the issue I had
    @Test
    public void choosingWrongInputIsNotAllowed() {
        thrown = assertThrows(InvalidLocationException.class, () -> chooser.locationFromInput("WRONG"));
    }
}
Lauren Moineau
Lauren Moineau
9,483 Points

Thanks Codrin. I haven't really looked into migration to JUnit 5 yet but I know some changes to the code are expected. I'm glad you sorted it out and thanks for posting your solution here. I'm sure it will help other students :)