Replace rspec-rails with rspec

#39

This PR replaces `rspec-rails` with `rspec`, and removes the
`activesupport` dependency, which should make it easier to use this gem
outside of a Rails environment.

As a nice bonus, it also reduces the total number of gem dependencies
(as reported by `bundle install`) from 35 to 15.

There were only a few methods provided by ActiveSupport that were being
used, which have been replaced.

json_matchers.gemspec

@@ -19,10 +19,9 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_dependency("json-schema", "~> 2.6.0")
-  spec.add_dependency("activesupport", '>= 3.0.0')
 
   spec.add_development_dependency "bundler", "~> 1.7"
   spec.add_development_dependency "pry"
   spec.add_development_dependency "rake", "~> 10.0"
-  spec.add_development_dependency "rspec-rails", ">= 2.0"
+  spec.add_development_dependency "rspec", ">= 2.0"
 end

lib/json_matchers.rb

@@ -1,10 +1,11 @@
 require "json_matchers/version"
 require "json_matchers/matcher"
 require "json_matchers/errors"
-require "active_support/all"
 
 module JsonMatchers
-  mattr_accessor :schema_root
+  class << self
+    attr_accessor :schema_root
+  end
 
   self.schema_root = "#{Dir.pwd}/spec/support/api/schemas"
 

lib/json_matchers/rspec.rb

@@ -44,6 +44,8 @@ def failure_message_when_negated(response)
       FAIL
     end
 
+    private
+
     def pretty_json(json_string)
       JSON.pretty_generate(JSON.parse(json_string.to_s))
     end

spec/json_matchers/match_response_schema_spec.rb

@@ -132,7 +132,12 @@
 
   def raise_formatted_error(error_message)
     raise_error do |error|
-      expect(error.message.squish).to include(error_message)
+      sanitized_message = error.message.
+        gsub(/\A[[:space:]]+/, "").
+        gsub(/[[:space:]]+\z/, "").
+        gsub(/[[:space:]]+/, " ")
+
+      expect(sanitized_message).to include(error_message)
     end
   end
 end

spec/support/file_helpers.rb

@@ -1,3 +1,6 @@
+require "fileutils"
+require "json"
+
 module FileHelpers
   ORIGINAL_SCHEMA_ROOT = JsonMatchers.schema_root
 
@@ -7,7 +10,7 @@ def create_schema(name, json)
       when NilClass, String
         file.write(json.to_s)
       else
-        file.write(json.to_json)
+        file.write(JSON.generate(json))
       end
     end
   end