Fix/issue 3913

_unittest/test_01_Design.py

@@ -38,8 +38,17 @@ def test_app(self):
         assert self.aedtapp
 
     def test_01_designname(self):
-        self.aedtapp.design_name = "myname"
-        assert self.aedtapp.design_name == "myname"
+        # TODO: Remove subsequent dependence on string "myname"
+        design_names = ["myname", "design2"]
+        self.aedtapp.design_name = design_names[0]  # Change the design name.
+        assert self.aedtapp.design_name == design_names[0]
+        self.aedtapp.insert_design(design_names[1])  # Insert a new design
+        assert self.aedtapp.design_name == design_names[1]
+        self.aedtapp.design_name = design_names[0]  # Change current design back.
+        assert len(self.aedtapp.design_list) == 2  # Make sure there are still 2 designs.
+        assert self.aedtapp.design_list[0] == design_names[0]  # Make sure the name is correct.
+        self.aedtapp.delete_design(design_names[1])  # Delete the 2nd design
+        assert len(self.aedtapp.design_list) == 1
 
     def test_01_version_id(self):
         assert self.aedtapp.aedt_version_id

pyaedt/application/Design.py

@@ -631,16 +631,21 @@ def design_name(self, new_name):
         if ";" in new_name:
             new_name = new_name.split(";")[1]
 
-        self.odesign.RenameDesignInstance(self.design_name, new_name)
-        timeout = 5.0
-        timestep = 0.1
-        while new_name not in [
-            i.GetName() if ";" not in i.GetName() else i.GetName().split(";")[1]
-            for i in list(self._oproject.GetDesigns())
-        ]:
-            time.sleep(timestep)
-            timeout -= timestep
-            assert timeout >= 0
+        # If new_name is the name of an existing design, set the current
+        # design to this design.
+        if new_name in self.design_list:
+            self.set_active_design(new_name)
+        else:  # Otherwise rename the current design.
+            self.odesign.RenameDesignInstance(self.design_name, new_name)
+            timeout = 5.0
+            timestep = 0.1
+            while new_name not in [
+                i.GetName() if ";" not in i.GetName() else i.GetName().split(";")[1]
+                for i in list(self._oproject.GetDesigns())
+            ]:
+                time.sleep(timestep)
+                timeout -= timestep
+                assert timeout >= 0
 
     @property
     def design_list(self):