diff --git a/java-core/src/main/java/ai/certifai/unittest/ex1/MathUtils.java b/java-core/src/main/java/ai/certifai/unittest/ex1/MathUtils.java
new file mode 100644
index 0000000..2f440a6
--- /dev/null
+++ b/java-core/src/main/java/ai/certifai/unittest/ex1/MathUtils.java
@@ -0,0 +1,43 @@
+package ai.certifai.unittest.ex1;
+
+/**
+ * Demo of Unit Test (Class)
+ *
+ * @author Boon Khai Yeoh
+ */
+
+/**
+ * This file contain some mathematical operation method
+ * which will use for the demonstration of Unit Test Function
+ * in the test folder
+ * Test file path : "test/java/ai/certifai/unitTest/ex1/MathUtilsTest.java"
+ *
+ */
+
+
+public class MathUtils {
+
+    public int add(int a, int b){
+        return a+b;
+
+    }
+
+    public int minus(int a, int b){
+        return  a-b;
+
+    }
+
+    public int mul(int a, int b){
+        return  a*b;
+
+    }
+
+    public int divide(int a,int b){
+        return a/b;
+
+    }
+
+}
+
+
+
diff --git a/java-core/src/main/java/ai/certifai/unittest/ex2/Coffee.java b/java-core/src/main/java/ai/certifai/unittest/ex2/Coffee.java
new file mode 100644
index 0000000..ad65564
--- /dev/null
+++ b/java-core/src/main/java/ai/certifai/unittest/ex2/Coffee.java
@@ -0,0 +1,118 @@
+package ai.certifai.unittest.ex2;
+
+/**
+ * Demo of Unit Test (Class)
+ * Solution : At Bottom of this file
+ * Test Naming Method : methodName_expectedBehavior_stateUnderTest
+ * @author Boon Khai Yeoh
+ */
+
+/**
+ * Task 1 : Create a test program file
+ *
+ *
+ * Task 2 : Create a simple test use assertEquals to evaluate the type of coffee
+ * by set the value Example : Coffee coffee = new Coffee("Espresso",9);
+ * and using coffeeTypeTest() to get the coffee type
+ *
+ *
+ * Task 3 : Create a simple test use assertEquals to evaluate the price of coffee
+ * by set the value Example : Coffee coffee = new Coffee("Latte",11);
+ * and using priceTest() to get the coffee price
+ *
+ *
+ * Task 4 : Create a simple test use assertAll to evaluate the types of coffee
+ * Your type of coffee should be include : Espresso, Latte ,Mocha
+ * and using allCoffeeTypeTest() to get the type of coffee
+ *
+ *
+ * Task 5 : Create a exception test to evaluate negative price value
+ * Type of Exception :  ExceptionIllegalArgumentException
+ *
+ */
+
+public class Coffee {
+
+    private String coffeeType;
+    private double price;
+
+
+
+    public Coffee(String coffeeType, double price){
+        this.coffeeType = coffeeType;
+        this.price=price;
+
+    }
+
+    public String getCoffeeType() {
+        return coffeeType;
+    }
+
+    public void setCoffeeType(String coffeeType) {
+        this.coffeeType = coffeeType;
+    }
+
+    public double getPrice() {
+        return price;
+    }
+
+    public void setPrice(double price) {
+        if (price <= -1 ){
+            throw new IllegalArgumentException("Price must be >=0");
+        }
+        this.price = price;
+    }
+
+}
+
+/** ============================================
+ *            Solution for test file
+ *  ============================================
+ * Task 1 : Create a test program file
+ * Put the cursor to the class name "Coffee"
+ * Right click -> Generate -> test
+ *
+ *
+ * Task 2 : Create a simple test use assertEquals to evaluate the type of coffee
+ *    @Test
+ *    @DisplayName("coffeeTypeTest_True_ifCoffeeTypeSameWithUserDefine")
+ *     void coffeeTypeTest() {
+ *         Coffee coffee = new Coffee("Espresso",9);
+ *         assertEquals("Espresso",coffee.getCoffeeType());
+ *     }
+ *
+ *
+ * Task 3 : Create a simple test use assertEquals to evaluate the price of coffee
+ *     @Test
+ *     @DisplayName("priceTest_True_ifCoffeePriceSameWithUserDefine")
+ *     void priceTest() {
+ *         Coffee coffee = new Coffee("Latte",11);
+ *         assertEquals(11,coffee.getPrice());
+ *     }
+ *
+ *
+ * Task 4 : Create a simple test use assertAll to evaluate the types of coffee
+ *     @Test
+ *     @DisplayName("allCoffeeTypeTest_True_ifAllCoffeeTypeSameWithUserDefine")
+ *     void allCoffeeTypeTest() {
+ *         Coffee espresso = new Coffee("Espresso",9);
+ *         Coffee latte = new Coffee("Latte",11);
+ *         Coffee mocha = new Coffee("Mocha",12);
+ *
+ *         assertAll(
+ *                 ()->assertEquals("Espresso",espresso.getCoffeeType()),
+ *                 ()->assertEquals("Latte",latte.getCoffeeType()),
+ *                 ()->assertEquals("Mocha",mocha.getCoffeeType())
+ *         );
+ *     }
+ *
+ *
+ * Task 5 : Create a exception test to evaluate negative price value
+ *     @Test
+ *     @DisplayName("priceExceptionTest_ExceptionThrown_ifCoffeePriceNegative")
+ *     void priceExceptionTest() {
+ *         Coffee coffee = new Coffee("Latte",11);
+ *         assertThrows(IllegalArgumentException.class,
+ *                 ()->coffee.setPrice(-1));
+ *     }
+ */
\ No newline at end of file
diff --git a/java-core/src/test/java/ai/certifai/unittest/ex1/MathUtilsTest.java b/java-core/src/test/java/ai/certifai/unittest/ex1/MathUtilsTest.java
new file mode 100644
index 0000000..69e5db0
--- /dev/null
+++ b/java-core/src/test/java/ai/certifai/unittest/ex1/MathUtilsTest.java
@@ -0,0 +1,135 @@
+package ai.certifai.unittest.ex1;
+
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.RepeatedTest;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * Demo of Unit Test (Test File)
+ * Test Naming Method : methodName_expectedBehavior_stateUnderTest
+ * @author Boon Khai Yeoh
+ */
+
+class MathUtilsTest {
+
+    /**
+     * Test Method 1 : Using assertEquals to compare two value.
+     *
+     * Usage :
+     * If both value are equal , the test will pass
+     *
+     */
+
+    @Test
+    @DisplayName("additionTest_True_ifCorrectSumOfTwoVariable")
+    void additionTest() {
+        MathUtils mathUtils = new MathUtils();
+        int expected = 2;
+        int actual = mathUtils.add(1,1);
+        assertEquals(expected,actual,"The sum expected to be 2");
+    }
+
+    /**
+     * Test Method 2 : Using assertAll to compare more value
+     *
+     * Usage :
+     * assertAll is use to compare all the value,
+     * evaluate all condition compare to assertEquals
+     * observe the difference between assertEquals and assertAll method
+     * Comment the @Disabled to review the difference
+     */
+
+    @Test
+    @Disabled
+    @DisplayName("equalsMultiplicationTest_True_ifCorrectProductOfTwoVariable")
+    void equalsMultiplicationTest(){
+        MathUtils mathUtils = new MathUtils();
+        assertEquals(4,mathUtils.mul(2,2));
+        assertEquals(2,mathUtils.mul(1,1));
+        assertEquals(3,mathUtils.mul(3,3));
+    }
+
+
+    @Test
+    @Disabled
+    @DisplayName("allMultiplicationTest_True_ifCorrectProductOfTwoVariable")
+    void allMultiplicationTest(){
+        MathUtils mathUtils = new MathUtils();
+        assertAll(
+                ()->assertEquals(4,mathUtils.mul(2,2)),
+                ()->assertEquals(2,mathUtils.mul(1,1)),
+                ()->assertEquals(3,mathUtils.mul(3,3))
+        );
+    }
+
+    /**
+     * Test Method 3 : assertThrows
+     *
+     * Usage :
+     * Use to evaluate the Exception
+     * assertThrows(Type of Exception,condition)
+     * when condition is meet the type of Exception,
+     * the test is pass
+     *
+     */
+
+    @Test
+    @DisplayName("divideTest_ExceptionThrown_ifInvalidAnswer")
+    void divideTest(){
+        MathUtils mathUtils = new MathUtils();
+        assertThrows(ArithmeticException.class,() -> mathUtils.divide(1,0));
+
+
+    }
+
+    /**
+     * Test Method 4 : ParameterizedTest
+     *
+     * Usage :
+     * Evaluate each element in the ValueSource
+     *
+     */
+
+    @ParameterizedTest
+    @DisplayName("allElementTest_True_ifZeroRemainder")
+    @ValueSource(ints ={3,4,5,6})
+    void allElementTest(int number){
+        assertEquals(0,number%3);
+
+    }
+
+
+    /**
+     * Test Method 5 : RepeatedTest
+     *
+     * Usage :
+     * Repeat the test base on the number input
+     * RepeatedTest(3) << Repeat the test 3 times
+     *
+     */
+
+    @RepeatedTest(3)
+    @DisplayName("repeatAddTest_True_ifCorrectSumOfTwoVariable")
+    void repeatAddTest() {
+        MathUtils mathUtils = new MathUtils();
+        int expected = 2;
+        int actual = mathUtils.add(1, 1);
+        assertEquals(expected, actual, "The sum expected to be 2");
+    }
+
+
+    /**
+     * Create the test function
+     * Task 1 : Evaluate difference of two value by create minus (subtraction) test case using assertEquals
+     *
+     *
+     * Task 2 : Compare more subtraction equation by using assertAll
+     */
+
+}
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
index c20262f..fc451ca 100644
--- a/pom.xml
+++ b/pom.xml
@@ -49,4 +49,33 @@
         </developer>
     </developers>
 
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>8</source>
+                    <target>8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>RELEASE</version>
+            <scope>test</scope>
+        </dependency>
+            <dependency>
+                <groupId>org.projectlombok</groupId>
+                <artifactId>lombok</artifactId>
+                <version>1.18.16</version>
+                <scope>provided</scope>
+        </dependency>
+        </dependencies>
+
+
 </project>
\ No newline at end of file