Java/src/test/java/com/thealgorithms/maths/MedianTest.java at master · TheAlgorithms/Java · GitHub

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packagecom.thealgorithms.maths;

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

importorg.junit.jupiter.api.Test;

/**
 * Test class for {@link Median}.
 * Tests various scenarios including edge cases, odd/even length arrays,
 * negative values, and unsorted inputs.
 */
classMedianTest {

@Test
voidtestMedianSingleValue() {
int[] arr = {0};
assertEquals(0, Median.median(arr));
 }

@Test
voidtestMedianSinglePositiveValue() {
int[] arr = {42};
assertEquals(42, Median.median(arr));
 }

@Test
voidtestMedianSingleNegativeValue() {
int[] arr = {-15};
assertEquals(-15, Median.median(arr));
 }

@Test
voidtestMedianTwoValues() {
int[] arr = {1, 2};
assertEquals(1.5, Median.median(arr));
 }

@Test
voidtestMedianTwoIdenticalValues() {
int[] arr = {5, 5};
assertEquals(5.0, Median.median(arr));
 }

@Test
voidtestMedianThreeValues() {
int[] arr = {1, 2, 3};
assertEquals(2, Median.median(arr));
 }

@Test
voidtestMedianThreeUnsortedValues() {
int[] arr = {3, 1, 2};
assertEquals(2, Median.median(arr));
 }

@Test
voidtestMedianDecimalValueReturn() {
int[] arr = {1, 2, 3, 4, 5, 6, 8, 9};
assertEquals(4.5, Median.median(arr));
 }

@Test
voidtestMedianNegativeValues() {
int[] arr = {-27, -16, -7, -4, -2, -1};
assertEquals(-5.5, Median.median(arr));
 }

@Test
voidtestMedianMixedPositiveAndNegativeValues() {
int[] arr = {-10, -5, 0, 5, 10};
assertEquals(0, Median.median(arr));
 }

@Test
voidtestMedianMixedUnsortedValues() {
int[] arr = {10, -5, 0, 5, -10};
assertEquals(0, Median.median(arr));
 }

@Test
voidtestMedianLargeOddArray() {
int[] arr = {9, 7, 5, 3, 1, 2, 4, 6, 8};
assertEquals(5, Median.median(arr));
 }

@Test
voidtestMedianLargeEvenArray() {
int[] arr = {10, 20, 30, 40, 50, 60, 70, 80, 90, 100};
assertEquals(55.0, Median.median(arr));
 }

@Test
voidtestMedianAllSameValues() {
int[] arr = {7, 7, 7, 7, 7};
assertEquals(7.0, Median.median(arr));
 }

@Test
voidtestMedianWithZeros() {
int[] arr = {0, 0, 0, 0, 0};
assertEquals(0.0, Median.median(arr));
 }

@Test
voidtestMedianAlreadySorted() {
int[] arr = {1, 2, 3, 4, 5};
assertEquals(3, Median.median(arr));
 }

@Test
voidtestMedianReverseSorted() {
int[] arr = {5, 4, 3, 2, 1};
assertEquals(3, Median.median(arr));
 }

@Test
voidtestMedianWithDuplicates() {
int[] arr = {1, 2, 2, 3, 3, 3, 4};
assertEquals(3, Median.median(arr));
 }

@Test
voidtestMedianEmptyArrayThrows() {
int[] arr = {};
assertThrows(IllegalArgumentException.class, () -> Median.median(arr));
 }

@Test
voidtestMedianNullArrayThrows() {
assertThrows(IllegalArgumentException.class, () -> Median.median(null));
 }

@Test
voidtestMedianExtremeValues() {
int[] arr = {Integer.MAX_VALUE, Integer.MIN_VALUE};
assertEquals(-0.5, Median.median(arr));
 }

@Test
voidtestMedianTwoNegativeValues() {
int[] arr = {-10, -20};
assertEquals(-15.0, Median.median(arr));
 }

@Test
voidtestMedianFourValuesEven() {
int[] arr = {1, 2, 3, 4};
assertEquals(2.5, Median.median(arr));
 }

@Test
voidtestMedianFiveValuesOdd() {
int[] arr = {10, 20, 30, 40, 50};
assertEquals(30.0, Median.median(arr));
 }
}