Adds error tests & method to get response object from Error class

lib/layer/api/error.rb

@@ -20,6 +20,10 @@ def initialize(response)
         super(build_error_message)
       end
 
+      def response
+        @response
+      end
+
       private
 
       def build_error_message

lib/layer/api/version.rb

@@ -1,5 +1,5 @@
 module Layer
   module Api
-    VERSION = "0.1.1"
+    VERSION = "0.2.0"
   end
 end

spec/layer/error_spec.rb

@@ -0,0 +1,59 @@
+require 'spec_helper'
+
+describe Layer::Api::Error do
+  describe ".from_response" do
+    it 'should raise NotFound error when status is 404' do
+      VCR.use_cassette('conversation') do
+        layer = Layer::Api::Client.new
+
+        expect {
+          layer.get_conversation("notfound")
+        }.to raise_error(Layer::Api::NotFound)
+      end
+    end
+
+    it "should raise BadRequest error when status is 400" do
+      response = {status: 400}
+      expect {
+        raise Layer::Api::Error.from_response(response)
+      }.to raise_error(Layer::Api::BadRequest)
+    end
+
+    (500..599).each do |error|
+      it "should raise ServerError when status is #{error}" do
+        response = {status: error}
+        expect {
+          raise Layer::Api::Error.from_response(response)
+        }.to raise_error(Layer::Api::ServerError)
+      end
+    end
+
+    it "should return Error when status isn't found/handled" do
+      expect {
+        raise Layer::Api::Error.from_response({})
+      }.to raise_error(Layer::Api::Error)
+    end
+  end
+
+  describe ".initialize" do
+    it "should set @response instance variable" do
+      begin
+        raise Layer::Api::Error.new({})
+      rescue => e
+        expect(e.response).to eq({})
+      end
+    end
+
+    it "should build correct error message containing status & body" do
+      status = '200'
+      body = 'random_test_body'
+      args = {
+        status: status,
+        body: body
+      }
+      error_msg = Layer::Api::Error.new(args).send(:build_error_message)
+      expect(error_msg).to include(status)
+      expect(error_msg).to include(body)
+    end
+  end
+end