Configurator tests: work against test-local config

So tests pass when service configs aren't set up.

References #28

Author: jeremy

test/service/configurator_test.rb

@@ -2,13 +2,13 @@
 
 class ActiveStorage::Service::ConfiguratorTest < ActiveSupport::TestCase
   test "builds correct service instance based on service name" do
-    service = ActiveStorage::Service::Configurator.build(:s3, SERVICE_CONFIGURATIONS)
-    assert_instance_of ActiveStorage::Service::S3Service, service
+    service = ActiveStorage::Service::Configurator.build(:foo, foo: { service: "Disk", root: "path" })
+    assert_instance_of ActiveStorage::Service::DiskService, service
   end
 
   test "raises error when passing non-existent service name" do
     assert_raise RuntimeError do
-      ActiveStorage::Service::Configurator.build(:bigfoot, SERVICE_CONFIGURATIONS)
+      ActiveStorage::Service::Configurator.build(:bigfoot, {})
     end
   end
 end