[Refactoring] Move MimePartTest to JUnit 5
diff --git a/mailbox/elasticsearch/src/test/java/org/apache/james/mailbox/elasticsearch/json/MimePartTest.java b/mailbox/elasticsearch/src/test/java/org/apache/james/mailbox/elasticsearch/json/MimePartTest.java
index 2bca61a..79a03c8 100644
--- a/mailbox/elasticsearch/src/test/java/org/apache/james/mailbox/elasticsearch/json/MimePartTest.java
+++ b/mailbox/elasticsearch/src/test/java/org/apache/james/mailbox/elasticsearch/json/MimePartTest.java
@@ -23,12 +23,12 @@
 import java.io.ByteArrayInputStream;
 import java.nio.charset.StandardCharsets;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
-public class MimePartTest {
+class MimePartTest {
 
     @Test
-    public void buildShouldWorkWhenTextualContentFromParserIsEmpty() {
+    void buildShouldWorkWhenTextualContentFromParserIsEmpty() {
         MimePart.builder()
             .addBodyContent(new ByteArrayInputStream(new byte[] {}))
             .addMediaType("text")
@@ -37,7 +37,7 @@
     }
 
     @Test
-    public void buildShouldWorkWhenTextualContentFromParserIsNonEmpty() {
+    void buildShouldWorkWhenTextualContentFromParserIsNonEmpty() {
         String body = "text";
         MimePart mimePart = MimePart.builder()
             .addBodyContent(new ByteArrayInputStream(body.getBytes(StandardCharsets.UTF_8)))