application test : junit5 - junit4 migration

application-test/app-test/pom.xml

@@ -27,6 +27,18 @@
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
+
+        <dependency>
+            <groupId>org.junit.vintage</groupId>
+            <artifactId>junit-vintage-engine</artifactId>
+            <scope>test</scope>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.hamcrest</groupId>
+                    <artifactId>hamcrest-core</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
     </dependencies>
 
     <build>

application-test/app-test/src/test/java/com/example/apptest/StudyJUnit4Test.java

@@ -0,0 +1,17 @@
+package com.example.apptest;
+
+import org.junit.Before;
+import org.junit.Test;
+
+public class StudyJUnit4Test {
+
+    @Before
+    public void before() {
+        System.out.println("before");
+    }
+
+    @Test
+    public void junit4_test() {
+        System.out.println("JUnit4_test");
+    }
+}