Fix flaky test

This fixes a flaky test by using a specific single-dose and multi-dose
programme.

Author: thomasleese

spec/lib/status_generator/programme_spec.rb

@@ -296,13 +296,21 @@
   end
 
   context "when consent is needed" do
+    let(:programme) { Programme.menacwy }
+
     its(:date) { should be_nil }
     its(:disease_types) { should be_nil }
     its(:dose_sequence) { should be_nil }
     its(:location_id) { should be_nil }
     its(:status) { should be(:needs_consent_no_response) }
     its(:vaccine_methods) { should be_nil }
     its(:without_gelatine) { should be_nil }
+
+    context "with a multi-dose programme" do
+      let(:programme) { Programme.mmr }
+
+      its(:dose_sequence) { should eq(1) }
+    end
   end
 
   context "when not eligible" do