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Java Unit Testing in Java What to Test The Happy Path and Beyond

The Happy Path And Beyond (I need some help)

What did I do wrong and how do I fix it

package com.teamtreehouse.vending;

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

import static org.junit.Assert.*;

public class AlphaNumericChooser {


    private AlphaNumericChooser chooser;

    @Before
    public void setUp() throws Exception {
        chooser = new AlphaNumericChooser(26, 10);
    }

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

        assertEquals("proper row", 1, loc.getRow());
        assertEquals("proper colunm", 3, loc.getColumn());
    }

}