Fix test based on the order of a node's children

Author: Slimane AMAR

src/test/java/org/gridsuite/study/server/NetworkModificationTreeTest.java

@@ -662,27 +662,27 @@ void testNodeManipulation() throws Exception {
         /*  expected :
                 root
                /    \
-           node1     node2
+   node1(hypo 1)     node2(loadflow)
         */
         assertChildrenEquals(Set.of(node1, node2), root.getChildren());
 
         node2.setName("niark");
         node1.setName("condriak");
         node1.setModificationGroupUuid(UUID.randomUUID());
-        createNode(root.getStudyId(), children.get(1), node2, userId);
-        createNode(root.getStudyId(), children.get(1), node1, userId);
+        AbstractNode child = children.get(0).getName().equals("loadflow") ? children.get(0) : children.get(1);
+        createNode(root.getStudyId(), child, node2, userId);
+        createNode(root.getStudyId(), child, node1, userId);
 
         /*  expected
                 root
                /    \
-           node1      node2
+           node1      node2(loadflow)
                     /    \
         node(condriak)   node(niark)
          */
 
         root = getRootNode(root.getStudyId(), firstRootNetwork);
-        AbstractNode child;
-        if (root.getChildren().get(0).getName().equals(children.get(1).getName())) {
+        if (root.getChildren().get(0).getName().equals(child.getName())) {
             child = root.getChildren().get(0);
         } else {
             child = root.getChildren().get(1);
@@ -693,23 +693,26 @@ void testNodeManipulation() throws Exception {
         deleteNode(root.getStudyId(), List.of(child), false, Set.of(child), true, userId);
 
         /*  expected
-              root
-            /   |   \
-          node node node
+                  root
+            /      |      \
+          node    node      node
+       (hypo 1) (condriak) (niark)
         */
 
         root = getRootNode(root.getStudyId(), firstRootNetwork);
         assertEquals(3, root.getChildren().size());
         child = root.getChildren().get(0);
+
         createNode(root.getStudyId(), child, node4, userId);
 
         deleteNode(root.getStudyId(), List.of(child), true, Set.of(child, node4), userId);
 
         /* expected
-             root
-              |
-             node
+                 root
+              |        \
+             node      node
          */
+
         root = getRootNode(root.getStudyId(), firstRootNetwork);
         assertEquals(2, root.getChildren().size());
         assertEquals(3, nodeRepository.findAll().size());