Best way to test multi NameMapping

Are you referring to something this Name Mapping - Conditional Mapping Criteria?

Hello. Not at all.

For now, in my Keywordtest I have this :

The final window (which contains the edit field and the button) is always the same. But the parent Aliases is different, because the final window is called from different program.

When I run this test, only one of these "If" is true. But I don't know which one. (this changes at each run). 

 And, due to the NameMapping timeout, it takes a long time.

I would like to simplifiy this.

The login window is always the same, properties don't change? However, it has different parents because you have three applications/programs? Therefore you've defined three name mappings for the login window?

How is the application called?

Use if...statements with WaitAliasChild method. You can wait up to a number of seconds before moving on. For example,

if (AliasObj.WaitAliasChild("App1.Login", 5000).Exists)
  Log.Message("Login 1")
else if (AliasObj.WaitAliasChild("App2.Login", 5000).Exists)
  Log.Error("Login 2");
else if (AliasObj.WaitAliasChild("App3.Login", 5000).Exists)
  Log.Error("Login 3");

Ok ! Thanks for your reply. Based on your example I created a script able to manage my case.
But instead of "else if" I use a switch case and a map.

I set a map() with all my mapped objects, then I parse this map and the first object that exists is passed to the switch.

Are you able to show an example?

This is what I doing for now. But I planned to find another method than namemapping to get the Edit field and the button. (If I can do this, the switch will no longer be necessary).

That's look good. You could also move the switch statement within the for loop, e.g. 

for (const [key, value] of arObj) {
  if (value.Exists && value.Visible == true) {
    switch (key):
	  case "plugin1":
	    // code
	    break;
	  case "plugin2":
	    // code
	    break;
	  default:
	    // error
  }
}

Ensure the code can be maintainable, and other testers can understand it.