fix: Fix Random Unit Test fail - Meeds-io/MIPs#119 (#970)

Prior to this change, the `DraftPageDAOTest` unit Test randomly fails when
two draft pages are added at the same millisecond on CI. This change
ensures to added both draft pages in different period of time to make
the unit test independent from Tests execution performances.

notes-service/src/test/java/org/exoplatform/wiki/jpa/dao/DraftPageDAOTest.java

@@ -329,7 +329,7 @@ public void testDeleteDraftPagesByName() {
   }
 
   @Test
-  public void testFindLatestDraftPageByTargetPage() {
+  public void testFindLatestDraftPageByTargetPage() throws InterruptedException {
     // Given
     WikiEntity wiki = new WikiEntity();
     wiki.setType("portal");
@@ -349,13 +349,19 @@ public void testFindLatestDraftPageByTargetPage() {
     dp1.setUpdatedDate(new Date());
     draftPageDAO.create(dp1);
     persist();
+
+    // Added to fix random fail when draft pages
+    // are added at the same time
+    Thread.sleep(10);
+
     DraftPageEntity dp2 = new DraftPageEntity();
     dp2.setName("draft2");
     dp2.setTargetPage(page);
     dp2.setAuthor("user1");
     dp2.setCreatedDate(new Date());
     dp2.setUpdatedDate(new Date());
     draftPageDAO.create(dp2);
+    persist();
 
     // When
     DraftPageEntity latestDraft = draftPageDAO.findLatestDraftPageByTargetPage(page.getId());