BAEL-639: Fixing failing test

testng/src/test/java/baeldung/com/SummationServiceTest.java

@@ -0,0 +1,95 @@
+package baeldung.com;
+
+import org.testng.Assert;
+import org.testng.TestNG;
+import org.testng.annotations.*;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class SummationServiceTest 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;
+    }
+
+}