Is "Test as add-on" for Google sheets editor add-ons broken?

Question

I wrote a Google Sheet editor add-on 1 year ago that I have been using ever since for my personal use. I didn't end up publishing it.

I have always used it with the same spreadsheet, launching with the legacy editor's "Run -> Test as add-on" giving it the Installed and Enabled authorization (I have a saved config for this). It worked like a charm, there is even some checking in the onOpen for whether it is Enabled for the doc.

Today it stopped working without me making any changes. Simply the add-on doesn't seem to load. The spreadsheet opens but the add-on is not invoked. I see no new executions in the logs and the add-on is neither loaded in the menu nor is the popup rendered which should if it is not Enabled. It seems like the Test as Add-on feature is broken. Tried it also with another spreadsheet that's compatible with the add-on with the same result. I even tried to create a net new test config with Installed and Enabled and got the same result.

Anyone experienced the same issue with Google Sheet editor add-ons run with "Test as add-on"? Any known workarounds or solutions to make it load again?

This the screen shot of my test settings showing that the add-on is configured to be Enabled for the document.

Here is my code snippet from onOpen that should catch if the add-on is not enabled:

     //Testing if the add-on is enabled against a compatible doc. Otherwise show welcome message with instructions. 
  var ret = null;
  try{
    ret = SpreadsheetApp.getActive().getRangeByName("TOTAL_RETAINED_VALUE");//Check if critical named range is defined.
  } catch (e){}//If the add-on is not enabled on the doc this call will throw an unauthorized excepton. 
  if (ret == null) 
    ui.alert("Welcome to the XXx add-on", "This add-on helps you XXX... more instructions on how to fix this issue", ui.ButtonSet.OK);

Answer 1

The test as add-on button in Chrome (as tested on Version 93.0.4577.63 Official Build x86_64 in MacBook Pro) is not directing to the correct url that allows you to view the tested add-on. If you test it in the latest Firefox it works.

Explanation: When you click on test as add-on, a preview document is supposed to be generated as per the official documentation . The add-on preview document has a specific URL. This url can also be shared with editors of the original test document (which allows for testing).

The format of the url is similar to https://docs.google.com/document/d/***id***/edit?addon_dry_run=***id**** When I tested the add on in Chrome the url is https://docs.google.com/document/d/**id**/edit without the additional addon_dry_run bit. However on testing it in Firefox, it worked perfectly. So a temporary fix would be to try a different browser, I recommend Firefox, to see if this addresses the issue.

Answer 2

It appears that the only Trigger Code allow to be tested is onInstall()

All other triggers are disable when "testing as addon..."

See Testing Google Sheet Addon Triggers for more details