Added Slack::Web::Api::Error#response, closes slack-ruby#22.

CHANGELOG.md

@@ -4,6 +4,7 @@
 * [#34](https://github.com/dblock/slack-ruby-client/pull/34): Added `Slack::RealTime::Client#start_async` - [@mikz](https://github.com/mikz), [@dblock](https://github.com/dblock).
 * `Slack::RealTime::Client` supports `:open` and `:close` callbacks - [@dblock](https://github.com/dblock).
 * [#32](https://github.com/dblock/slack-ruby-client/issues/32): Fix: `on_complete: undefined method [] for nil:NilClass` when responding to Slack 400-500 errors - [@dblock](https://github.com/dblock).
+* [#22](https://github.com/dblock/slack-ruby-client/issues/22): Added `Slack::Web::Api::Error#response` - [@dblock](https://github.com/dblock).
 * Your contribution here.
 
 ### 0.4.0 (11/8/2015)

lib/slack/web/api/error.rb

@@ -2,6 +2,12 @@ module Slack
   module Web
     module Api
       class Error < ::Faraday::Error
+        attr_reader :response
+
+        def initialize(message, response)
+          @response = response
+          super message
+        end
       end
     end
   end

lib/slack/web/faraday/response/raise_error.rb

@@ -5,7 +5,8 @@ module Response
         class RaiseError < ::Faraday::Response::Middleware
           def on_complete(env)
             body = env.body
-            fail Slack::Web::Api::Error, body['error'] unless body['ok']
+            return if body['ok']
+            fail Slack::Web::Api::Error.new(body['error'], env.response)
           end
         end
       end

spec/slack/web/api/error_spec.rb

@@ -0,0 +1,14 @@
+require 'spec_helper'
+
+RSpec.describe Slack::Web::Api::Error do
+  let(:client) { Slack::Web::Client.new }
+  it 'provides access to the response object', vcr: { cassette_name: 'web/auth_test_error' } do
+    begin
+      client.auth_test
+      fail 'Expected to receive Slack::Web::Api::Error.'
+    rescue Slack::Web::Api::Error => e
+      expect(e.response).to_not be_nil
+      expect(e.response.status).to eq 200
+    end
+  end
+end