Why am I getting “Error: Resolution method is overspecified”?

by

Just drop
.then(done); and replace function(done) with function()

You are returning a Promise so calling done is redundant as it said in error message

In the elder versions you had to use callback in case of async methods like that

it ('returns async', function(done) {
   callAsync()
   .then(function(result) {
      assert.ok(result);
      done();
   });
})

Now you have an alternative of returning a Promise

it ('returns async', function() {
  return new Promise(function (resolve) {
     callAsync()
       .then(function(result) {
          assert.ok(result);
          resolve();
       });
  });
})

But using both is misleading
(see for example here https://github.com/mochajs/mocha/issues/2407)

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