Make Grim::NullLogger act like Logger but not log anything

Author: jonmagic

lib/grim/null_logger.rb

@@ -1,4 +1,11 @@
+require "logger"
+
 module Grim
-  class NullLogger
+  class NullLogger < ::Logger
+    def initialize(*args)
+    end
+
+    def add(*args, &block)
+    end
   end
 end

spec/lib/grim/null_logger_spec.rb

@@ -0,0 +1,11 @@
+require 'spec_helper'
+require "stringio"
+
+describe Grim::NullLogger do
+  it "acts like Logger but doesn't log anything" do
+    io = StringIO.new
+    logger = Grim::NullLogger.new(io)
+    logger.debug "hello world"
+    expect(io.string).to eq("")
+  end
+end