java-tutorials/testing-modules/testng/src/test/java/com/baeldung/SummationServiceIntegrationTest.java

package com.baeldung;

import org.testng.Assert;
import org.testng.TestNG;
import org.testng.annotations.AfterClass;
import org.testng.annotations.AfterGroups;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.AfterSuite;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.BeforeGroups;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.BeforeSuite;
import org.testng.annotations.Test;

import java.util.ArrayList;
import java.util.List;

public class SummationServiceIntegrationTest extends TestNG {
    private List<Integer> numbers;

    private int testCount = 0;

    @BeforeClass
    public void initialize() {
        numbers = new ArrayList<>();
    }

    @AfterClass
    public void tearDown() {
        numbers = null;
    }

    @BeforeSuite(groups = "regression")
    public void runBeforeRegressionSuite() {
        numbers = new ArrayList<>();
        numbers.add(-11);
        numbers.add(2);
    }

    @AfterSuite(groups = "regression")
    public void runAfterRegressionSuite() {
        numbers = null;
    }

    @BeforeGroups("negative_tests")
    public void runBeforeEachNegativeGroup() {
        numbers.clear();
    }

    @BeforeGroups("regression")
    public void runBeforeEachRegressionGroup() {
        numbers.add(-11);
        numbers.add(2);
    }

    @BeforeGroups("positive_tests")
    public void runBeforeEachPositiveGroup() {
        numbers.add(1);
        numbers.add(2);
        numbers.add(3);
    }

    @AfterGroups("positive_tests,regression,negative_tests")
    public void runAfterEachGroup() {
        numbers.clear();
    }

    @BeforeMethod
    public void runBeforeEachTest() {
        testCount++;
    }

    @AfterMethod
    public void runAfterEachTest() {

    }


    @Test(groups = "positive_tests", enabled = false)
    public void givenNumbers_sumEquals_thenCorrect() {
        int sum = numbers.stream().reduce(0, Integer::sum);
        Assert.assertEquals(sum, 6);
    }

    @Test(groups = "negative_tests")
    public void givenEmptyList_sumEqualsZero_thenCorrect() {
        int sum = numbers.stream().reduce(0, Integer::sum);
        Assert.assertEquals(0, sum);
    }

    @Test(groups = "regression")
    public void givenNegativeNumber_sumLessthanZero_thenCorrect() {
        int sum = numbers.stream().reduce(0, Integer::sum);
        Assert.assertTrue(sum < 0);
    }

    @Test(expectedExceptions = ArithmeticException.class)
    public void givenNumber_whenThrowsException_thenCorrect() {
        int i = 1 / 0;
    }

}