DogShow.java

package main;

public class DogShow {
	public static String exclude(int place) {
		StringBuilder output = new StringBuilder();
		for (int i = 1; i <= 100; i++) {
			if (i != place) {
				output.append(i);
				if (i > 3 && i < 21) {
					output.append("th");
				} else if (i % 10 == 3) {
					output.append("rd");
				} else if (i % 10 == 2) {
					output.append("nd");
				} else if (i % 10 == 1) {
					output.append("st");
				} else {
					output.append("th");
				}
				output.append(", ");
			}
		}
		return output.substring(0, output.length() - 2);
	}
}

DogShowTest.java

package testing;

import static org.junit.Assert.assertEquals;

import org.junit.Test;

import main.DogShow;

public class DogShowTest {
	
	@Test
	public void initTest() {
		assertEquals("String is empty", false, DogShow.exclude(1).isEmpty());
	}
	
	@Test
	public void excludeTest() {
		assertEquals("Place has not been removed", false, DogShow.exclude(2).contains(" 2nd"));
	}
	
	@Test
	public void endsWithCommaTest() {
		assertEquals("String ends in comma.", false, DogShow.exclude(100).endsWith(", "));
	}
	
	@Test
	public void teenTest() {
		assertEquals("Teens are incorrectly formatted", true, DogShow.exclude(5).contains("12th"));
	}

}