RubyEventStore configuration - a new way to handle upcoming features

ruby_event_store/lib/ruby_event_store.rb

@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require_relative "ruby_event_store/configuration"
 require_relative "ruby_event_store/dispatcher"
 require_relative "ruby_event_store/subscriptions"
 require_relative "ruby_event_store/broker"

ruby_event_store/lib/ruby_event_store/configuration.rb

@@ -0,0 +1,26 @@
+module RubyEventStore
+  class Configuration
+    def initialize
+      load_defaults(VERSION)
+    end
+
+    attr_reader :loaded_defaults
+    attr_accessor :test
+
+    def load_defaults(version)
+      self.test = "2.17.0" <= version ? "new_value" : "current_value"
+      @loaded_defaults = version
+      self
+    end
+  end
+
+  class << self
+    def configuration
+      @configuration ||= Configuration.new
+    end
+
+    def configure
+      yield(configuration)
+    end
+  end
+end

ruby_event_store/spec/configuration_spec.rb

@@ -0,0 +1,23 @@
+require "spec_helper"
+require "ruby_event_store/configuration"
+
+module RubyEventStore
+  ::RSpec.describe Configuration do
+    specify { expect(RubyEventStore::Configuration.new.load_defaults("2.17.0").loaded_defaults).to eq("2.17.0") }
+    specify { expect(RubyEventStore::Configuration.new.loaded_defaults).to eq(RubyEventStore::VERSION) }
+    specify { expect(RubyEventStore::Configuration.new.test).to eq("current_value") }
+    specify { expect(RubyEventStore::Configuration.new.load_defaults("1.0.0").test).to eq("current_value") }
+    specify { expect(RubyEventStore::Configuration.new.load_defaults("2.17.0").test).to eq("new_value") }
+    specify { expect(RubyEventStore::Configuration.new.load_defaults("2.20.0").test).to eq("new_value") }
+
+    specify { expect(RubyEventStore.configuration).to be_a(RubyEventStore::Configuration) }
+    specify do
+      RubyEventStore.configure do |config|
+        config.load_defaults("2.0.0")
+        config.test = "another_value"
+      end
+      expect(RubyEventStore.configuration.loaded_defaults).to eq("2.0.0")
+      expect(RubyEventStore.configuration.test).to eq("another_value")
+    end
+  end
+end