`meteor test-packages` doesn't run tinytests on server?

help
1 
// package.js
Package.onTest(function(api) {
  api.use([
    'tinytest',
    'mongo',
    'my-package']);
  
  // Using A, B, *or* C below -- no luck running my test on the server

  // A
  api.addFiles('my-package-tests.js');
  
  // B
  api.addFiles('my-package-tests.js', ['client', 'server']);
  
  // C
  api.mainModule('my-package-tests.js', 'client')
  api.mainModule('my-package-tests.js', 'server')
});

// my-package-tests.js
if (Meteor.isServer) console.log('SERVER')
else if (Meteor.isClient) console.log('CLIENT')

Tinytest.add("simple", function (test) {
  test.equal(1, 1);
})

I’m running using

meteor test-packages ./packages/my-package --port 25111 --release 3.0.4

The simple test runs on the client, in a browser, but on the server, no tests are run. SERVER does indeed print, but again, no tests run.

Do I need to adjust my command or package.js? What gives?

Thanks!