Add mechanism for configuring a cache store via initializer

Author: Libo Cannici

lib/curly.rb

@@ -51,4 +51,5 @@ def self.valid?(template, presenter_class)
 require 'curly/compiler'
 require 'curly/presenter'
 require 'curly/template_handler'
+require 'curly/configuration'
 require 'curly/railtie' if defined?(Rails)

lib/curly/configuration.rb

@@ -0,0 +1,25 @@
+module Curly
+  class << self
+    attr_writer :configuration
+  end
+
+  def self.configuration
+    @configuration ||= Configuration.new
+  end
+
+  def self.configure
+    yield(configuration)
+  end
+
+  def self.reset
+    @configuration = Configuration.new
+  end
+
+  class Configuration
+    attr_accessor :cache_store
+
+    def initialize
+      @cache_store = nil
+    end
+  end
+end

spec/configuration_spec.rb

@@ -0,0 +1,41 @@
+describe Curly::Configuration do
+  after do
+    Curly.reset
+  end
+
+  describe "#cache_store" do
+    it "defaults to nil" do
+      cache_store = Curly::Configuration.new.cache_store
+
+      expect(cache_store).to be_nil
+    end
+  end
+
+  describe ".configure" do
+    before do
+      Curly.configure do |config|
+        config.cache_store = 'foobar'
+      end
+    end
+
+    it "returns correct value for cache_store" do
+      presenters_namespace = Curly.configuration.cache_store
+
+      expect(presenters_namespace).to eq('foobar')
+    end
+  end
+
+  describe ".reset" do
+    it "resets the configuration to default value" do
+      Curly.configure do |config|
+        config.cache_store = 'foobarbaz'
+      end
+
+      Curly.reset
+
+      cache_store = Curly::Configuration.new.cache_store
+
+      expect(cache_store).to be_nil
+    end
+  end
+end