TwoPointersTest.java

packagecom.thealgorithms.others;

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

importorg.junit.jupiter.api.Test;

publicclassTwoPointersTest {

@Test
voidtestPositivePairExists() {
int[] arr = {2, 6, 9, 22, 121};
intkey = 28;
assertTrue(TwoPointers.isPairedSum(arr, key));
 }

@Test
voidtestNegativePairExists() {
int[] arr = {-12, -1, 0, 8, 12};
intkey = 0;
assertTrue(TwoPointers.isPairedSum(arr, key));
 }

@Test
voidtestPairDoesNotExist() {
int[] arr = {0, 12, 12, 35, 152};
intkey = 13;
assertFalse(TwoPointers.isPairedSum(arr, key));
 }

@Test
voidtestNegativeSumPair() {
int[] arr = {-10, -3, 1, 2, 5, 9};
intkey = -8;
assertTrue(TwoPointers.isPairedSum(arr, key));
 }

@Test
voidtestPairDoesNotExistWithPositiveSum() {
int[] arr = {1, 2, 3, 4, 5};
intkey = 10;
assertFalse(TwoPointers.isPairedSum(arr, key));
 }

@Test
voidtestEmptyArray() {
int[] arr = {};
intkey = 5;
assertFalse(TwoPointers.isPairedSum(arr, key));
 }

@Test
voidtestSingleElementArray() {
int[] arr = {5};
intkey = 5;
assertFalse(TwoPointers.isPairedSum(arr, key));
 }

@Test
voidtestArrayWithDuplicateElements() {
int[] arr = {1, 1, 3, 5, 5};
intkey = 6;
assertTrue(TwoPointers.isPairedSum(arr, key));
 }

@Test
voidtestPairExistsAtEdges() {
int[] arr = {1, 3, 4, 7, 8};
intkey = 9;
assertTrue(TwoPointers.isPairedSum(arr, key));
 }
}