on init, connect to AWS and check for the AS group

bin/aws-ha-release.rb

@@ -25,3 +25,6 @@ if opts[:aws_access_key].nil? || opts[:aws_secret_key].nil?
   opts[:aws_access_key] = ENV['AWS_ACCESS_KEY']
   opts[:aws_secret_key] = ENV['AWS_SECRET_KEY']
 end
+
+require 'aws-missing-tools'
+AwsHaRelease.new(opts)

features/support/env.rb

@@ -1 +1,6 @@
 require 'aruba/cucumber'
+require 'aws-sdk'
+
+Before do
+  AWS.stub!
+end

lib/aws-missing-tools/aws-ha-release/aws-ha-release.rb

@@ -1,2 +1,12 @@
 class AwsHaRelease
+  def initialize(opts)
+    AWS.config(access_key_id: opts[:aws_access_key], secret_access_key: opts[:aws_secret_key], region: opts[:region])
+
+    @as = AWS::AutoScaling.new
+    @group = @as.groups[opts[:as_group_name]]
+
+    if @group.nil?
+      raise ArgumentError, "The Auto Scaling Group named #{opts[:as_group_name]} does not exist in #{opts[:region]}."
+    end
+  end
 end

spec/aws-missing-tools/aws-ha-release/aws-ha-release_spec.rb

@@ -10,13 +10,25 @@ describe 'aws-ha-release' do
     }
   end
 
+  let(:as) { AWS::FakeAutoScaling.new }
+
   before do
     AWS.stub(:config)
-    AWS::AutoScaling.stub(:new).and_return(AWS::FakeAutoScaling.new)
+    AWS::AutoScaling.stub(:new).and_return(as)
   end
 
   describe '#initialize' do
-    it 'initializes the AWS connection'
+    it 'initializes the AWS connection' do
-    it 'ensures the as group exists'
+      as.groups.create 'test_group'
+
+      AWS.should_receive(:config).with(access_key_id: 'testaccesskey', secret_access_key: 'testsecretkey', region: 'test-region')
+      AwsHaRelease.new(opts)
+    end
+
+    it 'ensures the as group exists' do
+      lambda {
+        AwsHaRelease.new(opts.merge!(as_group_name: 'fake_group'))
+      }.should raise_error
+    end
   end
 end

spec/support/fake_auto_scaling.rb

@@ -2,5 +2,31 @@ module AWS
   class FakeAutoScaling
     def initialize
     end
+
+    def groups
+      @groups ||= GroupCollection.new
+    end
+
+    class GroupCollection
+      def initialize
+        @groups = {}
+      end
+
+      def [](name)
+        @groups[name]
+      end
+
+      def create(name, options = {})
+        @groups[name] = Group.new name
+      end
+    end
+
+    class Group
+      attr_reader :name
+
+      def initialize(name)
+        @name = name
+      end
+    end
   end
 end