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testing: add more cases for AverageTest (#6384)

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* testing: add more cases for AverageTest

* checkstyle: fix formatting
This commit is contained in:
Oleksandr Klymenko
2025-07-16 18:10:22 +03:00
committed by GitHub
parent 434ab50ff4
commit dd1a51b20f
1 changed files with 30 additions and 15 deletions
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45
src/test/java/com/thealgorithms/maths/AverageTest.java
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@@ -1,33 +1,48 @@
package com.thealgorithms.maths;
import org.junit.jupiter.api.Assertions;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import java.util.stream.Stream;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;
public class AverageTest {
private static final double SMALL_VALUE = 0.00001d;
@Test
public void testAverageDouble12() {
double[] numbers = {3d, 6d, 9d, 12d, 15d, 18d, 21d};
Assertions.assertEquals(12d, Average.average(numbers), SMALL_VALUE);
@ParameterizedTest(name = "average({0}) should be approximately {1}")
@MethodSource("provideDoubleArrays")
void testAverageDouble(double[] numbers, double expected) {
assertEquals(expected, Average.average(numbers), SMALL_VALUE);
}
@ParameterizedTest(name = "average({0}) should be {1}")
@MethodSource("provideIntArrays")
void testAverageInt(int[] numbers, long expected) {
assertEquals(expected, Average.average(numbers));
}
@Test
public void testAverageDouble20() {
double[] numbers = {5d, 10d, 15d, 20d, 25d, 30d, 35d};
Assertions.assertEquals(20d, Average.average(numbers), SMALL_VALUE);
void testAverageDoubleThrowsExceptionOnNullOrEmpty() {
assertThrows(IllegalArgumentException.class, () -> Average.average((double[]) null));
assertThrows(IllegalArgumentException.class, () -> Average.average(new double[0]));
}
@Test
public void testAverageDouble() {
double[] numbers = {1d, 2d, 3d, 4d, 5d, 6d, 7d, 8d};
Assertions.assertEquals(4.5d, Average.average(numbers), SMALL_VALUE);
void testAverageIntThrowsExceptionOnNullOrEmpty() {
assertThrows(IllegalArgumentException.class, () -> Average.average((int[]) null));
assertThrows(IllegalArgumentException.class, () -> Average.average(new int[0]));
}
@Test
public void testAverageInt() {
int[] numbers = {2, 4, 10};
Assertions.assertEquals(5, Average.average(numbers));
private static Stream<Arguments> provideDoubleArrays() {
return Stream.of(Arguments.of(new double[] {3d, 6d, 9d, 12d, 15d, 18d, 21d}, 12d), Arguments.of(new double[] {5d, 10d, 15d, 20d, 25d, 30d, 35d}, 20d), Arguments.of(new double[] {1d, 2d, 3d, 4d, 5d, 6d, 7d, 8d}, 4.5d), Arguments.of(new double[] {0d, 0d, 0d}, 0d),
Arguments.of(new double[] {-1d, -2d, -3d}, -2d), Arguments.of(new double[] {1e-10, 1e-10, 1e-10}, 1e-10));
}
private static Stream<Arguments> provideIntArrays() {
return Stream.of(Arguments.of(new int[] {2, 4, 10}, 5L), Arguments.of(new int[] {0, 0, 0}, 0L), Arguments.of(new int[] {-1, -2, -3}, -2L), Arguments.of(new int[] {1, 1, 1, 1, 1}, 1L));
}
}