Add a JiraIssue class

app/models/jira_issue.rb

+class JiraIssue
+  def initialize(issue_identifier)
+    @issue_identifier = issue_identifier
+  end
+
+  def to_s
+    @issue_identifier.to_s
+  end
+
+  def id
+    @issue_identifier.to_s
+  end
+
+  def iid
+    @issue_identifier.to_s
+  end
+
+  def ==(other)
+    other.is_a?(self.class) && (to_s == other.to_s)
+  end
+end

spec/models/jira_issue_spec.rb

+require 'spec_helper'
+
+describe JiraIssue do
+  subject { JiraIssue.new('JIRA-123') }
+
+  its(:id) { should eq('JIRA-123') }
+  its(:iid) { should eq('JIRA-123') }
+  its(:to_s) { should eq('JIRA-123') }
+
+  describe :== do
+    specify { subject.should eq(JiraIssue.new('JIRA-123')) }
+    specify { subject.should_not eq(JiraIssue.new('JIRA-124')) }
+
+    it 'only compares with JiraIssues' do
+      subject.should_not eq('JIRA-123')
+    end
+  end
+end