DRIVERS-2769 Clarify not validating saslSupportedMechs

Author: comandeo-mongo

spec/mongo/server/pending_connection_spec.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Mongo::Server::PendingConnection do
+  let(:socket) { StringIO.new }
+
+  let(:pending_connection) do
+    described_class.new(socket, nil, nil)
+  end
+
+  context 'when saslSupportedMechs attribute contains an unknown mechanism' do
+    it 'does not raise an error' do
+      expect do
+        pending_connection.handshake_and_authenticate!
+      end.not_to raise_error
+    end
+  end
+end