TwoSumProblemTest.java

packagecom.thealgorithms.misc;

importstaticorg.junit.jupiter.api.Assertions.assertEquals;
importstaticorg.junit.jupiter.api.Assertions.assertFalse;

importorg.apache.commons.lang3.tuple.Pair;
importorg.junit.jupiter.api.Test;

/**
 * Test case for Two sum Problem.
 * @author Bama Charan Chhandogi (https://github.com/BamaCharanChhandogi)
 */

publicclassTwoSumProblemTest {

@Test
voidtestTwoSumExists() {
finalint[] values = newint[] {2, 7, 11, 15};
finalinttarget = 9;
finalvarexpected = Pair.of(0, 1); // values[0] + values[1] = 2 + 7 = 9
assertEquals(expected, TwoSumProblem.twoSum(values, target).get());
 }

@Test
voidtestTwoSumNoSolution() {
finalint[] values = newint[] {2, 7, 11, 15};
finalinttarget = 3;
assertFalse(TwoSumProblem.twoSum(values, target).isPresent());
 }

@Test
voidtestTwoSumMultipleSolutions() {
finalint[] values = {3, 3};
finalinttarget = 6;
finalvarexpected = Pair.of(0, 1); // values[0] + values[1] = 3 + 3 = 6
assertEquals(expected, TwoSumProblem.twoSum(values, target).get());
 }

@Test
voidtestTwoSumMultipleSolution() {
finalint[] values = {3, 4, 3, 3};
finalinttarget = 6;
finalvarexpected = Pair.of(0, 2); // values[0] + values[2] = 3 + 3 = 6
assertEquals(expected, TwoSumProblem.twoSum(values, target).get());
 }

@Test
voidtestTwoSumNegativeNumbers() {
finalint[] values = {-1, -2, -3, -4, -5};
finalinttarget = -8;
finalvarexpected = Pair.of(2, 4); // values[2] + values[4] = -3 + (-5) = -8
assertEquals(expected, TwoSumProblem.twoSum(values, target).get());
 }

@Test
voidtestTwoSumNoSolutionDuplicatedInputs() {
finalint[] values = {0, 0, 0};
finalinttarget = 100;
assertFalse(TwoSumProblem.twoSum(values, target).isPresent());
 }
}