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import org.junit.Test;
import static org.junit.Assert.assertEquals;
import org.junit.runners.JUnit4;
import java.util.*;
public class SolutionTest {
@Test
public void SumOnlyOneElement() {
assertEquals(0, Solution.sum(new int[] { 6 }));
}
@Test
public void SumOnlyTwoElements() {
assertEquals(0, Solution.sum(new int[] { 6, 7 }));
}
@Test
public void SumPositives() {
assertEquals(16, Solution.sum(new int[] { 6, 2, 1, 8, 10 }));
}
@Test
public void SumPositivesWithDoubleMax() {
assertEquals(17, Solution.sum(new int[] { 6, 0, 1, 10, 10 }));
}
@Test
public void SumNegatives() {
assertEquals(-28, Solution.sum(new int[] { -6, -20, -1, -10, -12}));
}
@Test
public void SumMixed() {
assertEquals(3, Solution.sum(new int[] { -6, 20, -1, 10, -12}));
}
@Test
public void SumEmptyArray() {
assertEquals(0, Solution.sum(new int[0]));
}
@Test
public void SumNullArray() {
assertEquals(0, Solution.sum(null));
}
@Test
public void SumRandom() {
for(int r=0; r<20;r++)
{
int[] numbers = new int[6];
for(int i=0; i< numbers.length; i++)
{
numbers[i] = (int)Math.floor(Math.random() * 1100 - 500);
}
int sum = 0;
for(int i = 0 ; i < numbers.length; i++) {
sum += numbers[i];
}
int min = Arrays.stream(numbers).min().getAsInt();
int max = Arrays.stream(numbers).max().getAsInt();
int expected = sum - min - max;
assertEquals(expected, Solution.sum(numbers));
}
}
}
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