diff --git a/test_tjnetwork.py b/test_tjnetwork.py
index 1628e2d..2ab4ad0 100644
--- a/test_tjnetwork.py
+++ b/test_tjnetwork.py
@@ -1,4 +1,5 @@
 import pytest
+import random
 from tjnetwork import *
 
 class TestApi:
@@ -242,6 +243,221 @@ class TestApi:
         self.leave(p)
 
 
+    def test_delete_nodes_then_restore(self):
+        p = 'test_delete_nodes_then_restore'
+        read_inp(p, f'./inp/net3.inp', '2')
+
+        open_project(p)
+
+        nls : list[tuple[str, str]] = []
+
+        nodes = get_nodes(p)
+        for node in nodes:
+            nls.append(('node', node))
+
+        links = get_links(p)
+
+        for _ in range(100):
+            random.shuffle(nls)
+            for nl in nls:
+                if nl[0] == 'node':
+                    node = nl[1]
+                    if is_junction(p, node):
+                        delete_junction(p, ChangeSet({'id': node}))
+                    if is_reservoir(p, node):
+                        delete_reservoir(p, ChangeSet({'id': node}))
+                    if is_tank(p, node):
+                        delete_tank(p, ChangeSet({'id': node}))
+                else:
+                    link = nl[1]
+                    if is_pipe(p, link):
+                        delete_pipe(p, ChangeSet({'id': link}))
+                    if is_pump(p, link):
+                        delete_pump(p, ChangeSet({'id': link}))
+                    if is_valve(p, link):
+                        delete_valve(p, ChangeSet({'id': link}))
+
+        for node in nodes:
+            assert is_node(p, node) == False
+        for link in links:
+            assert is_link(p, link) == False
+
+        assert get_nodes(p) == []
+        assert get_links(p) == []
+
+        op = get_restore_operation(p)
+        pick_operation(p, op)
+
+        for node in nodes:
+            assert is_node(p, node)
+        for link in links:
+            assert is_link(p, link)
+
+        self.leave(p)
+
+
+    def test_delete_links_then_restore(self):
+        p = 'test_delete_links_then_restore'
+        read_inp(p, f'./inp/net3.inp', '2')
+
+        open_project(p)
+
+        nls : list[tuple[str, str]] = []
+
+        nodes = get_nodes(p)
+
+        links = get_links(p)
+        for link in links:
+            nls.append(('link', link))
+
+        for _ in range(100):
+            random.shuffle(nls)
+            for nl in nls:
+                if nl[0] == 'node':
+                    node = nl[1]
+                    if is_junction(p, node):
+                        delete_junction(p, ChangeSet({'id': node}))
+                    if is_reservoir(p, node):
+                        delete_reservoir(p, ChangeSet({'id': node}))
+                    if is_tank(p, node):
+                        delete_tank(p, ChangeSet({'id': node}))
+                else:
+                    link = nl[1]
+                    if is_pipe(p, link):
+                        delete_pipe(p, ChangeSet({'id': link}))
+                    if is_pump(p, link):
+                        delete_pump(p, ChangeSet({'id': link}))
+                    if is_valve(p, link):
+                        delete_valve(p, ChangeSet({'id': link}))
+
+        for node in nodes:
+            assert is_node(p, node)
+        for link in links:
+            assert is_link(p, link) == False
+
+        assert get_links(p) == []
+
+        op = get_restore_operation(p)
+        pick_operation(p, op)
+
+        for node in nodes:
+            assert is_node(p, node)
+        for link in links:
+            assert is_link(p, link)
+
+        self.leave(p)
+
+
+    def test_delete_nodes_links_then_restore_v2(self):
+        p = 'test_delete_nodes_links_then_restore_v2'
+        read_inp(p, f'./inp/net3.inp', '2')
+
+        open_project(p)
+
+        nls : list[tuple[str, str]] = []
+
+        nodes = get_nodes(p)
+        for node in nodes:
+            nls.append(('node', node))
+
+        links = get_links(p)
+        for link in links:
+            nls.append(('link', link))
+
+        for _ in range(100):
+            random.shuffle(nls)
+            for nl in nls:
+                if nl[0] == 'node':
+                    node = nl[1]
+                    if is_junction(p, node):
+                        delete_junction(p, ChangeSet({'id': node}))
+                    if is_reservoir(p, node):
+                        delete_reservoir(p, ChangeSet({'id': node}))
+                    if is_tank(p, node):
+                        delete_tank(p, ChangeSet({'id': node}))
+                else:
+                    link = nl[1]
+                    if is_pipe(p, link):
+                        delete_pipe(p, ChangeSet({'id': link}))
+                    if is_pump(p, link):
+                        delete_pump(p, ChangeSet({'id': link}))
+                    if is_valve(p, link):
+                        delete_valve(p, ChangeSet({'id': link}))
+
+        for node in nodes:
+            assert is_node(p, node) == False
+        for link in links:
+            assert is_link(p, link) == False
+
+        assert get_nodes(p) == []
+        assert get_links(p) == []
+
+        op = get_restore_operation(p)
+        pick_operation(p, op)
+
+        for node in nodes:
+            assert is_node(p, node)
+        for link in links:
+            assert is_link(p, link)
+
+        self.leave(p)
+
+
+    def test_delete_nodes_links_then_restore_v3(self):
+        p = 'test_delete_nodes_links_then_restore_v3'
+        read_inp(p, f'./inp/net3.inp', '3')
+
+        open_project(p)
+
+        nls : list[tuple[str, str]] = []
+
+        nodes = get_nodes(p)
+        for node in nodes:
+            nls.append(('node', node))
+
+        links = get_links(p)
+        for link in links:
+            nls.append(('link', link))
+
+        for _ in range(100):
+            random.shuffle(nls)
+            for nl in nls:
+                if nl[0] == 'node':
+                    node = nl[1]
+                    if is_junction(p, node):
+                        delete_junction(p, ChangeSet({'id': node}))
+                    if is_reservoir(p, node):
+                        delete_reservoir(p, ChangeSet({'id': node}))
+                    if is_tank(p, node):
+                        delete_tank(p, ChangeSet({'id': node}))
+                else:
+                    link = nl[1]
+                    if is_pipe(p, link):
+                        delete_pipe(p, ChangeSet({'id': link}))
+                    if is_pump(p, link):
+                        delete_pump(p, ChangeSet({'id': link}))
+                    if is_valve(p, link):
+                        delete_valve(p, ChangeSet({'id': link}))
+
+        for node in nodes:
+            assert is_node(p, node) == False
+        for link in links:
+            assert is_link(p, link) == False
+
+        assert get_nodes(p) == []
+        assert get_links(p) == []
+
+        op = get_restore_operation(p)
+        pick_operation(p, op)
+
+        for node in nodes:
+            assert is_node(p, node)
+        for link in links:
+            assert is_link(p, link)
+
+        self.leave(p)
+
+
     # 1 title