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Create NearestElementTest.java #6677

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51 changes: 51 additions & 0 deletions src/test/java/com/thealgorithms/datastructures/stacks/NearestElementTest.java
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package datastructures.stacks;
import static org.junit.jupiter.api.Assertions.assertArrayEquals;
import org.junit.jupiter.api.Test;
class NearestElementTest {
@Test
void testNearestGreaterToRight_basic() {
int[] arr = {4, 5, 2, 25};
int[] expected = {5, 25, 25, -1};
assertArrayEquals(expected, NearestElement.nearestGreaterToRight(arr));
}
@Test
void testNearestGreaterToLeft_basic() {
int[] arr = {4, 5, 2, 25};
int[] expected = {-1, -1, 5, -1};
assertArrayEquals(expected, NearestElement.nearestGreaterToLeft(arr));
}
@Test
void testNearestSmallerToRight_basic() {
int[] arr = {4, 5, 2, 25};
int[] expected = {2, 2, -1, -1};
assertArrayEquals(expected, NearestElement.nearestSmallerToRight(arr));
}
@Test
void testNearestSmallerToLeft_basic() {
int[] arr = {4, 5, 2, 25};
int[] expected = {-1, 4, -1, 2};
assertArrayEquals(expected, NearestElement.nearestSmallerToLeft(arr));
}
@Test
void testEdgeCases_emptyAndSingle() {
int[] empty = {};
int[] single = {10};
assertArrayEquals(new int[]{}, NearestElement.nearestGreaterToRight(empty));
assertArrayEquals(new int[]{-1}, NearestElement.nearestGreaterToRight(single));
assertArrayEquals(new int[]{-1}, NearestElement.nearestGreaterToLeft(single));
assertArrayEquals(new int[]{-1}, NearestElement.nearestSmallerToRight(single));
assertArrayEquals(new int[]{-1}, NearestElement.nearestSmallerToLeft(single));
}
@Test
void testDuplicates() {
int[] arr = {2, 2, 2};
int[] ngr = {-1, -1, -1}; // strictly greater required
int[] ngl = {-1, -1, -1};
int[] nsr = {-1, -1, -1}; // strictly smaller required
int[] nsl = {-1, -1, -1};
assertArrayEquals(ngr, NearestElement.nearestGreaterToRight(arr));
assertArrayEquals(ngl, NearestElement.nearestGreaterToLeft(arr));
assertArrayEquals(nsr, NearestElement.nearestSmallerToRight(arr));
assertArrayEquals(nsl, NearestElement.nearestSmallerToLeft(arr));
}
}
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