AccountManager implementation

lib/betfair_api_ng_rails.rb

@@ -10,6 +10,7 @@ module BetfairApiNgRails
 
   autoload :Account
   autoload :AccountSession
+  autoload :AccountManager
 
   module Api
     extend ActiveSupport::Autoload

lib/betfair_api_ng_rails/account_manager.rb

+require 'singleton'
+
+module BetfairApiNgRails
+  class AccountManager
+    include Singleton
+
+    attr_reader :accounts
+    attr_reader :default_account
+
+    def initialize
+      clear
+    end
+
+    def store(account)
+      accounts[account.username] = account
+    end
+
+    def get(username)
+      accounts.fetch username, fetch_default_account
+    end
+
+    def default(username)
+      @default_account = username
+    end
+
+    def clear
+      @accounts = {}
+    end
+
+    private
+
+    def fetch_default_account
+      accounts.fetch default_account, nil
+    end
+  end
+end

spec/lib/betfair_api_ng_rails/account_manager_spec.rb

+require 'spec_helper'
+
+describe BetfairApiNgRails::AccountManager do
+  let(:account) { BetfairApiNgRails::Account.new('user001', 'password', 'cf23f23') }
+  subject(:manager) { described_class.instance }
+
+  it { is_expected.to respond_to :accounts }
+
+  describe '#store' do
+    before do
+      manager.clear
+    end
+
+    it 'stores account in global hash' do
+      expect{
+        manager.store account
+      }.to change(manager.accounts, :count).by 1
+    end
+  end
+
+  describe '#get' do
+    context 'gets account by username' do
+      context 'when it exists' do
+        before do
+          manager.store account
+        end
+
+        it 'returns this one' do
+          expect(manager.get('user001')).to eq account
+        end
+      end
+
+      context 'when it not exists' do
+        context 'and default exists' do
+          before do
+            manager.store account
+            manager.default 'user001'
+          end
+
+          it 'returns it' do
+            expect(manager.get('user002')).to eq account
+          end
+        end
+
+        context 'and no defaults' do
+          before do
+            manager.clear
+          end
+
+          it 'returns nil' do
+            expect(manager.get('user002')).to be_nil
+          end
+        end
+      end
+    end
+  end
+
+  describe '#clear' do
+    before do
+      manager.store account
+    end
+
+    it 'cleares account register' do
+      manager.clear
+      expect(manager.accounts.count).to eq 0
+    end
+  end
+
+  describe '#default' do
+    it 'sets default account' do
+      expect{
+        manager.default 'user001'
+      }.to_not raise_error
+    end
+  end
+end