Tests should be able to run without --auth

Author: estolfo

spec/mongo/collection_spec.rb

@@ -521,7 +521,7 @@
       end
     end
 
-    context 'when the user is not authorized' do
+    context 'when the user is not authorized', if: auth_enabled? do
 
       let(:view) do
         unauthorized_collection.find

spec/mongo/database_spec.rb

@@ -180,7 +180,7 @@
       end
     end
 
-    context 'when the user is not authorized', unless: sharded? do
+    context 'when the user is not authorized', if: auth_enabled? do
 
       let(:database) do
         described_class.new(unauthorized_client, TEST_DB)

spec/spec_helper.rb

@@ -20,6 +20,7 @@
 Mongo::Logger.logger = Logger.new($stdout)
 Mongo::Logger.logger.level = Logger::INFO
 
+require 'pry'
 require 'support/travis'
 require 'support/matchers'
 require 'support/authorization'
@@ -171,6 +172,15 @@ def failing_delete_doc
                            { que: { field: 'test' } }
 end
 
+# Try running a command on the admin database to see if the mongod was started with auth.
+#
+# @since 2.2.0
+def auth_enabled?
+  $mongo_client ||= initialize_scanned_client!
+  begin; $mongo_client.use(:admin).command(getCmdLineOpts: 1); rescue; return true; end
+  false
+end
+
 # Initializes a basic scanned client to do an ismaster check.
 #
 # @since 2.0.0