diff --git a/shared-lib/lib-ot/tests/node/operation_test.rs b/shared-lib/lib-ot/tests/node/operation_test.rs
index d60b035c1c..ba8e76b4d9 100644
--- a/shared-lib/lib-ot/tests/node/operation_test.rs
+++ b/shared-lib/lib-ot/tests/node/operation_test.rs
@@ -73,7 +73,7 @@ fn operation_update_node_body_deserialize_test() {
 }
 
 #[test]
-fn operation_insert_transform_test() {
+fn operation_insert_op_transform_test() {
     let node_1 = NodeDataBuilder::new("text_1").build();
     let node_2 = NodeDataBuilder::new("text_2").build();
     let op_1 = NodeOperation::Insert {
@@ -81,7 +81,7 @@ fn operation_insert_transform_test() {
         nodes: vec![node_1],
     };
 
-    let mut insert_2 = NodeOperation::Insert {
+    let insert_2 = NodeOperation::Insert {
         path: Path(vec![0, 1]),
         nodes: vec![node_2],
     };
@@ -95,14 +95,23 @@ fn operation_insert_transform_test() {
 }
 
 #[test]
-fn operation_insert_transform_test2() {
+fn operation_insert_transform_test() {
     let mut test = NodeTest::new();
     let node_data_1 = NodeDataBuilder::new("text_1").build();
     let node_data_2 = NodeDataBuilder::new("text_2").build();
-    let node_2: Node = node_data_2.clone().into();
     let node_data_3 = NodeDataBuilder::new("text_3").build();
     let node_3: Node = node_data_3.clone().into();
-
+    //
+    //  rev_id:1  0: text_1
+    //  rev_id:2  1: text_2
+    //
+    //  Insert a new operation with rev_id 1.But the rev_id:1 is already exist, so
+    //  it needs to do the transform.
+    //
+    //  --> 1:text_3
+    //  transform into:
+    //  --> 2:text_3
+    //
     let scripts = vec![
         InsertNode {
             path: 0.into(),
@@ -119,14 +128,65 @@ fn operation_insert_transform_test2() {
             node_data: node_data_3.clone(),
             rev_id: 1,
         },
-        // AssertNode {
-        //     path: 2.into(),
-        //     expected: node_2,
-        // },
         AssertNode {
-            path: 1.into(),
-            expected: node_3,
+            path: 2.into(),
+            expected: Some(node_3),
         },
     ];
     test.run_scripts(scripts);
 }
+
+#[test]
+fn operation_delete_transform_test() {
+    let mut test = NodeTest::new();
+    let node_data_1 = NodeDataBuilder::new("text_1").build();
+    let node_data_2 = NodeDataBuilder::new("text_2").build();
+    let node_data_3 = NodeDataBuilder::new("text_3").build();
+    let node_3: Node = node_data_3.clone().into();
+
+    let scripts = vec![
+        InsertNode {
+            path: 0.into(),
+            node_data: node_data_1.clone(),
+            rev_id: 1,
+        },
+        InsertNode {
+            path: 1.into(),
+            node_data: node_data_2.clone(),
+            rev_id: 2,
+        },
+        // The node's in the tree will be:
+        // 0: text_1
+        // 2: text_2
+        //
+        // The insert action is happened concurrently with the delete action, because they
+        // share the same rev_id. aka, 3. The delete action is want to delete the node at index 1,
+        // but it was moved to index 2.
+        InsertNode {
+            path: 1.into(),
+            node_data: node_data_3.clone(),
+            rev_id: 3,
+        },
+        //
+        // 0: text_1
+        // 1: text_3
+        // 2: text_2
+        //
+        // The path of the delete action will be transformed to a new path that point to the text_2.
+        // 1 -> 2
+        DeleteNode {
+            path: 1.into(),
+            rev_id: 3,
+        },
+        AssertNode {
+            path: 1.into(),
+            expected: Some(node_3),
+        },
+        AssertNode {
+            path: 2.into(),
+            expected: None,
+        },
+        AssertNumberOfNodesAtPath { path: None, len: 2 },
+    ];
+    test.run_scripts(scripts);
+}
diff --git a/shared-lib/lib-ot/tests/node/script.rs b/shared-lib/lib-ot/tests/node/script.rs
index 01d1ad16db..2ebc7c9fba 100644
--- a/shared-lib/lib-ot/tests/node/script.rs
+++ b/shared-lib/lib-ot/tests/node/script.rs
@@ -22,6 +22,7 @@ pub enum NodeScript {
     },
     DeleteNode {
         path: Path,
+        rev_id: usize,
     },
     AssertNumberOfNodesAtPath {
         path: Option<Path>,
@@ -33,16 +34,12 @@ pub enum NodeScript {
     },
     AssertNode {
         path: Path,
-        expected: Node,
+        expected: Option<Node>,
     },
     AssertNodeDelta {
         path: Path,
         expected: TextDelta,
     },
-    ApplyTransaction {
-        transaction: Transaction,
-        rev_id: usize,
-    },
 }
 
 pub struct NodeTest {
@@ -92,15 +89,20 @@ impl NodeTest {
                     .finalize();
                 self.apply_transaction(transaction);
             }
-            NodeScript::DeleteNode { path } => {
-                let transaction = TransactionBuilder::new(&self.node_tree)
+            NodeScript::DeleteNode { path, rev_id } => {
+                let mut transaction = TransactionBuilder::new(&self.node_tree)
                     .delete_node_at_path(&path)
                     .finalize();
+                self.transform_transaction_if_need(&mut transaction, rev_id);
                 self.apply_transaction(transaction);
             }
             NodeScript::AssertNode { path, expected } => {
-                let node_id = self.node_tree.node_id_at_path(path).unwrap();
-                let node = self.node_tree.get_node(node_id).cloned().unwrap();
+                let node_id = self.node_tree.node_id_at_path(path);
+                if expected.is_none() && node_id.is_none() {
+                    return;
+                }
+
+                let node = self.node_tree.get_node(node_id.unwrap()).cloned();
                 assert_eq!(node, expected);
             }
             NodeScript::AssertNodeData { path, expected } => {
@@ -136,14 +138,6 @@ impl NodeTest {
                     panic!("Node body type not match, expect Delta");
                 }
             }
-
-            NodeScript::ApplyTransaction {
-                mut transaction,
-                rev_id,
-            } => {
-                self.transform_transaction_if_need(&mut transaction, rev_id);
-                self.apply_transaction(transaction);
-            }
         }
     }
 
diff --git a/shared-lib/lib-ot/tests/node/tree_test.rs b/shared-lib/lib-ot/tests/node/tree_test.rs
index 39357b158c..90427457d0 100644
--- a/shared-lib/lib-ot/tests/node/tree_test.rs
+++ b/shared-lib/lib-ot/tests/node/tree_test.rs
@@ -185,7 +185,10 @@ fn node_delete_test() {
             node_data: inserted_node,
             rev_id: 1,
         },
-        DeleteNode { path: path.clone() },
+        DeleteNode {
+            path: path.clone(),
+            rev_id: 2,
+        },
         AssertNodeData { path, expected: None },
     ];
     test.run_scripts(scripts);