BAEL-3504: Added Unit test file and removed old class file

core-java-modules/core-java-reflection/src/main/java/com/baeldung/reflection/exception/invocationtarget/InvocationTargetDemo.java

@@ -1,19 +0,0 @@
-package com.baeldung.reflection.exception.invocationtarget;
-
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
-
-public class InvocationTargetDemo {
-    public static void main(String[] args) throws Throwable {
-
-        try {
-
-            InvocationTargetExample targetExample = new InvocationTargetExample();
-            Method method = InvocationTargetExample.class.getMethod("divideByZeroExample");
-            method.invoke(targetExample);
-        } catch (InvocationTargetException e) {
-
-            throw e.getCause();
-        }
-    }
-}

core-java-modules/core-java-reflection/src/test/java/com/baeldung/reflection/exception/invocationtarget/InvocationTargetUnitTest.java

@@ -0,0 +1,20 @@
+package com.baeldung.reflection.exception.invocationtarget;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+import org.junit.jupiter.api.Test;
+
+public class InvocationTargetUnitTest {
+
+    @Test
+    public void whenCallingMethodThrowsException_thenAssertTrue() throws Exception {
+        InvocationTargetExample targetExample = new InvocationTargetExample();
+        Method method = InvocationTargetExample.class.getMethod("divideByZeroExample");
+        Exception exception = assertThrows(InvocationTargetException.class, () -> method.invoke(targetExample));
+        assertEquals(ArithmeticException.class, exception.getCause().getClass());
+    }
+}