MaximumCoinsGainTest.java

import org.junit.Test;

import java.util.Arrays;
import java.util.List;

import static org.junit.Assert.*;

public class MaximumCoinsGainTest {

    private int expected;
    private List<Integer> coins;

    @Test
    public void computeMaximum1() throws Exception {
        expected = 5;
        coins = Arrays.asList(1,5);

        test(expected, coins);
    }

    @Test
    public void computeMaximum2() throws Exception {
        expected = 15;
        coins = Arrays.asList(5,1,10,5);

        test(expected, coins);
    }

    @Test
    public void computeMaximum3() throws Exception {
        expected = 31;
        coins = Arrays.asList(10,25,5,1,10,5);

        test(expected, coins);
    }

    private static void test(int expected, List<Integer> coins) {
        assertEquals(expected, MaximumCoinsGain.computeMaximum(coins));
    }

}