Ensure only open schools are onboarded

This adds validation to the onboarding process to ensure that only
schools with a status of open or opening are added to the onboarding
files, helping to ensure that we don't onboard a location that isn't
open.

Author: thomasleese

app/models/onboarding.rb

@@ -133,11 +133,14 @@ class ExistingSchool
     validates :existing_team, absence: true
     validates :location, presence: true
     validates :team, presence: true
+    validates :status, inclusion: %w[open opening]
 
     def location
       @location ||= Location.school.find_by(urn:)
     end
 
+    delegate :status, to: :location, allow_nil: true
+
     def existing_team
       location&.team
     end

spec/fixtures/files/onboarding/invalid.yaml

@@ -7,3 +7,4 @@ teams:
 
 schools:
   unknown_team: [123456, 234567]
+  team_1: [567890]

spec/models/onboarding_spec.rb

@@ -7,12 +7,14 @@
 
   let!(:programme) { create(:programme, :hpv) }
   # rubocop:disable RSpec/IndexedLet
-  let!(:school1) { create(:school, :secondary, urn: "123456") }
-  let!(:school2) { create(:school, :secondary, urn: "234567") }
-  let!(:school3) { create(:school, :secondary, urn: "345678") }
-  let!(:school4) { create(:school, :secondary, urn: "456789") }
+  let!(:school1) { create(:school, :secondary, :open, urn: "123456") }
+  let!(:school2) { create(:school, :secondary, :open, urn: "234567") }
+  let!(:school3) { create(:school, :secondary, :open, urn: "345678") }
+  let!(:school4) { create(:school, :secondary, :open, urn: "456789") }
   # rubocop:enable RSpec/IndexedLet
 
+  before { create(:school, :secondary, :closed, urn: "567890") }
+
   context "with a valid configuration file" do
     let(:filename) { "onboarding/valid.yaml" }
 
@@ -71,6 +73,7 @@
           "organisation.privacy_policy_url": ["can't be blank"],
           "school.0.team": ["can't be blank"],
           "school.1.team": ["can't be blank"],
+          "school.2.status": ["is not included in the list"],
           "team.email": ["can't be blank"],
           "team.name": ["can't be blank"],
           clinics: ["can't be blank"],