add size method.

update Guardfile.

fixes issue #7

Guardfile

@@ -1,10 +1,13 @@
-guard 'rspec' , cmd: 'rspec --drb' do
-  watch(%r{^lib/(.+)\.rb$})  { |m| "spec/#{m[1]}_spec.rb" }
-  watch(%r{^spec/(.+)\.rb$}) { |m| "spec/#{m[1]}_spec.rb" }
+guard 'rspec', cmd: 'rspec --drb' do
+  watch(/^spec\/.+_spec\.rb$/)
+  watch(/^lib\/(.+)\.rb$/)  { |m| "spec/#{m[1]}_spec.rb" }
+  watch(/^spec\/(.+)\.rb$/) { |m| "spec/#{m[1]}_spec.rb" }
   watch('spec/spec_helper.rb') { 'spec' }
+
+  watch(/^lib\/(.+)\.rb$/) { |m| "spec/#{m[1]}_spec.rb" }
 end
 
 guard :rubocop, all_on_start: true, cmd: ['--format', 'clang', '-c', '.rubocop.yml'] do
-  watch(%r{^lib/(.+)\.rb$})
-  watch(%r{\.rubocop.yml$})
+  watch(/^lib\/(.+)\.rb$/)
+  watch(/\.rubocop.yml$/)
 end

lib/tinybucket/model/page.rb

@@ -19,6 +19,10 @@ def initialize(json, item_klass)
                  end
       end
 
+      def size
+        @attrs[:size]
+      end
+
       def each(options = {})
         loop do
           start = (@attrs[:page] - 1) * @attrs[:pagelen]

spec/lib/tinybucket/model/page_spec.rb

@@ -0,0 +1,58 @@
+require 'spec_helper'
+
+RSpec.describe Tinybucket::Model::Page do
+
+  let(:json) do
+    text = File.read('spec/fixtures/repositories/get.json')
+    JSON.parse(text)
+  end
+
+  let(:klass) { Tinybucket::Model::Repository }
+  let(:model) { Tinybucket::Model::Page.new(json, klass) }
+
+  describe 'initialize' do
+    subject { model }
+
+    it 'create instance' do
+      expect(subject).to be_an_instance_of(Tinybucket::Model::Page)
+
+      expect(subject.attrs[:size]).to eq(json['size'])
+      expect(subject.attrs[:page]).to eq(json['page'])
+      expect(subject.attrs[:pagelen]).to eq(json['pagelen'])
+      expect(subject.attrs[:next]).to eq(json['next'])
+      expect(subject.attrs[:previous]).to eq(json['previous'])
+
+      expect(subject.items.size).to eq(json['values'].size)
+    end
+  end
+
+  describe 'size' do
+    subject { model.size }
+
+    let(:base_json) do
+      text = File.read('spec/fixtures/repositories/get.json')
+      JSON.parse(text)
+    end
+
+    context 'when json contains size = nil' do
+      let(:json) do
+        base_json['size'] = nil
+        base_json
+      end
+      it { expect(subject).to be_nil }
+    end
+
+    context 'when json contains size' do
+      let(:size) { 1000 }
+      let(:json) do
+        base_json['size'] = size
+        base_json
+      end
+      it { expect(subject).to eq(size) }
+    end
+  end
+
+  describe 'each' do
+    pending 'TODO add specs'
+  end
+end