feat: add tests for nest level

tests/test_core/test_model.py

@@ -67,3 +67,4 @@ def test_sort_reverse(self):
         self.assertEqual([i.description for i in w.siblings], names[::-1])
         w.reverse_siblings()
         self.assertEqual([i.description for i in w.siblings], names)
+

tests/test_core/test_todo.py

@@ -98,3 +98,15 @@ def test_comparable_fields(self):
         fields = Todo.comparable_fields()
         expected_fields = ['description', 'due', 'effort', 'recurrence', 'urgency', 'pending']
         self.assertEqual(fields, expected_fields)
+
+    def test_nest_level(self):
+        w = Workspace()
+
+        t = w.add_todo()
+        self.assertEqual(t.nest_level, 0)
+
+        t = t.add_todo()
+        self.assertEqual(t.nest_level, 1)
+
+        t = t.add_todo()
+        self.assertEqual(t.nest_level, 2)

tests/test_core/test_workspace.py

@@ -81,3 +81,13 @@ def test_comparable_fields(self):
         fields = Workspace.comparable_fields()
         expected_fields = ['description']
         self.assertEqual(fields, expected_fields)
+
+    def test_nest_level(self):
+        w = Workspace()
+        self.assertEqual(w.nest_level, 0)
+
+        w = w.add_workspace()
+        self.assertEqual(w.nest_level, 1)
+
+        w = w.add_workspace()
+        self.assertEqual(w.nest_level, 2)