Ensure Service Desk handler is first

spec/lib/gitlab/email/handler_spec.rb

+require 'spec_helper'
+
+describe Gitlab::Email::Handler, lib: true do
+  before do
+    stub_incoming_email_setting(enabled: true, address: "incoming+%{key}@appmail.adventuretime.ooo")
+    stub_config_setting(host: 'localhost')
+  end
+
+  let(:email_raw) { fixture_file('emails/service_desk.eml') }
+  let(:email_raw) { fixture_file('emails/valid_new_issue.eml') }
+  let(:email_raw) { fixture_file('emails/valid_reply.eml') }
+  let(:email_raw) { fixture_file('emails/valid_reply.eml').gsub(mail_key, "#{mail_key}+unsubscribe") }
+
+  let!(:project)  { create(:empty_project) }
+
+  let!(:user) do
+    create(
+      :user,
+      email: 'jake@adventuretime.ooo',
+      incoming_email_token: 'auth_token'
+    )
+  end
+
+  describe '.for' do
+    def handler_for(fixture, mail_key)
+      described_class.for(fixture_file(fixture), mail_key)
+    end
+
+    context 'a Service Desk email' do
+      it 'uses the Service Desk handler when Service Desk is enabled' do
+        allow_any_instance_of(License).to receive(:add_on?).and_call_original
+        allow_any_instance_of(License).to receive(:add_on?).with('GitLab_ServiceDesk').and_return(true)
+
+
+        expect(handler_for('emails/service_desk.eml', 'service_desk+auth_token')).to be_instance_of(Gitlab::Email::Handler::EE::ServiceDeskHandler)
+      end
+
+      it 'uses the create issue handler when Service Desk is disabled' do
+        allow_any_instance_of(License).to receive(:add_on?).and_call_original
+        allow_any_instance_of(License).to receive(:add_on?).with('GitLab_ServiceDesk').and_return(false)
+
+
+        expect(handler_for('emails/service_desk.eml', 'service_desk+auth_token')).to be_instance_of(Gitlab::Email::Handler::CreateIssueHandler)
+      end
+    end
+
+    context 'a new issue email' do
+      it 'uses the create issue handler when Service Desk is enabled' do
+        allow_any_instance_of(License).to receive(:add_on?).and_call_original
+        allow_any_instance_of(License).to receive(:add_on?).with('GitLab_ServiceDesk').and_return(true)
+
+        expect(handler_for('emails/valid_new_issue.eml', 'incoming+auth_token')).to be_instance_of(Gitlab::Email::Handler::CreateIssueHandler)
+      end
+
+      it 'uses the create issue handler when Service Desk is disabled' do
+        allow_any_instance_of(License).to receive(:add_on?).and_call_original
+        allow_any_instance_of(License).to receive(:add_on?).with('GitLab_ServiceDesk').and_return(false)
+
+
+        expect(handler_for('emails/valid_new_issue.eml', 'incoming+auth_token')).to be_instance_of(Gitlab::Email::Handler::CreateIssueHandler)
+      end
+    end
+  end
+end