BAEL-919: Introduction to JUnitParams (#1938)

* BAEL-919
Added the JUnitParams intorduction classes

* BAEL-919
Added the JUnitParams intorduction classes

* Reverting the adding to libraries folder

testing/src/test/java/com/baeldung/junitparams/SafeAdditionUtilTest.java

@@ -0,0 +1,54 @@
+package com.baeldung.junitparams;
+
+import static org.junit.Assert.assertEquals;
+
+import junitparams.FileParameters;
+import junitparams.JUnitParamsRunner;
+import junitparams.Parameters;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(JUnitParamsRunner.class)
+public class SafeAdditionUtilTest {
+
+    private SafeAdditionUtil serviceUnderTest = new SafeAdditionUtil();
+
+    @Test
+    @Parameters({ "1, 2, 3", "-10, 30, 20", "15, -5, 10", "-5, -10, -15" })
+    public void whenWithAnnotationProvidedParams_thenSafeAdd(int a, int b, int expectedValue) {
+        assertEquals(expectedValue, serviceUnderTest.safeAdd(a, b));
+    }
+
+    @Test
+    @Parameters(method = "parametersToTestAdd")
+    public void whenWithNamedMethod_thendSafeAdd(int a, int b, int expectedValue) {
+        assertEquals(expectedValue, serviceUnderTest.safeAdd(a, b));
+    }
+
+    private Object[] parametersToTestAdd() {
+        return new Object[] { new Object[] { 1, 2, 3 }, new Object[] { -10, 30, 20 }, new Object[] { Integer.MAX_VALUE, 2, Integer.MAX_VALUE }, new Object[] { Integer.MIN_VALUE, -8, Integer.MIN_VALUE } };
+    }
+
+    @Test
+    @Parameters
+    public void whenWithnoParam_thenLoadByNameSafeAdd(int a, int b, int expectedValue) {
+        assertEquals(expectedValue, serviceUnderTest.safeAdd(a, b));
+    }
+
+    private Object[] parametersForWhenWithnoParam_thenLoadByNameSafeAdd() {
+        return new Object[] { new Object[] { 1, 2, 3 }, new Object[] { -10, 30, 20 }, new Object[] { Integer.MAX_VALUE, 2, Integer.MAX_VALUE }, new Object[] { Integer.MIN_VALUE, -8, Integer.MIN_VALUE } };
+    }
+
+    @Test
+    @Parameters(source = TestDataProvider.class)
+    public void whenWithNamedClass_thenSafeAdd(int a, int b, int expectedValue) {
+        assertEquals(expectedValue, serviceUnderTest.safeAdd(a, b));
+    }
+
+    @Test
+    @FileParameters("src/test/resources/JunitParamsTestParameters.csv")
+    public void whenWithCsvFile_thenSafeAdd(int a, int b, int expectedValue) {
+        assertEquals(expectedValue, serviceUnderTest.safeAdd(a, b));
+    }
+
+}

testing/src/test/java/com/baeldung/junitparams/TestDataProvider.java

@@ -0,0 +1,13 @@
+package com.baeldung.junitparams;
+
+public class TestDataProvider {
+
+    public static Object[] provideBasicData() {
+        return new Object[] { new Object[] { 1, 2, 3 }, new Object[] { -10, 30, 20 }, new Object[] { 15, -5, 10 }, new Object[] { -5, -10, -15 } };
+    }
+
+    public static Object[] provideEdgeCaseData() {
+        return new Object[] { new Object[] { Integer.MAX_VALUE, 2, Integer.MAX_VALUE }, new Object[] { Integer.MIN_VALUE, -2, Integer.MIN_VALUE }, };
+    }
+
+}

testing/src/test/resources/JunitParamsTestParameters.csv

@@ -0,0 +1,4 @@
+1,2,3
+-10, 30, 20
+15, -5, 10
+-5, -10, -15