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BAEL-8774: Simple tests and examples #18795

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Sep 8, 2025
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BAEL-8774: Simple tests and examples #18795

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88 changes: 88 additions & 0 deletions ...es/core-java-numbers-10/src/test/java/com/baeldung/samesign/SameSignIntegersUnitTest.java
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package com.baeldung.samesign;

import org.junit.Test;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;

public class SameSignIntegersUnitTest {

@Test
public void givenTwoPositiveNumbers_whenUsingConditionalChecks_thenReturnTrue() {
int a = 5;
int b = 3;

boolean sameSign = (a >= 0 && b >= 0) || (a < 0 && b < 0);

assertTrue(sameSign);
}

@Test
public void givenPositiveAndNegativeNumbers_whenUsingConditionalChecks_thenReturnFalse() {
int a = 5;
int b = -3;

boolean sameSign = (a >= 0 && b >= 0) || (a < 0 && b < 0);

assertFalse(sameSign);
}

@Test
public void givenTwoNegativeNumbers_whenUsingMultiplication_thenReturnTrue() {
int a = -5;
int b = -3;

boolean sameSign = (a * b) > 0;

assertTrue(sameSign);
}

@Test
public void givenZeroAndAnyNumber_whenUsingMultiplication_thenReturnFalse() {
int a = 0;
int b = 5;

boolean sameSign = (a * b) > 0;

assertFalse(sameSign);
}

@Test
public void givenTwoPositiveNumbers_whenUsingBitwiseXOR_thenReturnTrue() {
int a = 5;
int b = 3;

boolean sameSign = (a ^ b) >= 0;

assertTrue(sameSign);
}

@Test
public void givenPositiveAndNegativeNumbers_whenUsingBitwiseXOR_thenReturnFalse() {
int a = 5;
int b = -3;

boolean sameSign = (a ^ b) >= 0;

assertFalse(sameSign);
}

@Test
public void givenTwoNegativeNumbers_whenUsingMathSignum_thenReturnTrue() {
int a = -5;
int b = -3;

boolean sameSign = Math.signum(a) == Math.signum(b);

assertTrue(sameSign);
}

@Test
public void givenZeroAndPositiveNumber_whenUsingMathSignum_thenReturnFalse() {
int a = 0;
int b = 5;

boolean sameSign = Math.signum(a) == Math.signum(b);

assertFalse(sameSign);
}
}