Don't fall back to fixture data in production

app/lib/emergency_contact_details.rb

@@ -1,7 +1,11 @@
 class EmergencyContactDetails
   def self.fetch
-    config_str = ENV["EMERGENCY_CONTACT_DETAILS"] || File.read(Rails.root.join("config/emergency_contact_details.json"))
+    config_str = ENV["EMERGENCY_CONTACT_DETAILS"]
+    raise MissingEnvVar if config_str.nil?
+
     config = JSON.parse(config_str)
     ActiveSupport::HashWithIndifferentAccess.new(config)
   end
+
+  class MissingEnvVar < StandardError; end
 end

config/environments/development.rb

@@ -64,4 +64,6 @@
   config.hosts += [
     "support.dev.gov.uk",
   ]
+
+  ENV["EMERGENCY_CONTACT_DETAILS"] = ENV["EMERGENCY_CONTACT_DETAILS"] || File.read(Rails.root.join("config/emergency_contact_details.json"))
 end

config/environments/test.rb

@@ -54,4 +54,6 @@
 
   # Annotate rendered view with file names.
   # config.action_view.annotate_rendered_view_with_filenames = true
+
+  ENV["EMERGENCY_CONTACT_DETAILS"] = ENV["EMERGENCY_CONTACT_DETAILS"] || File.read(Rails.root.join("config/emergency_contact_details.json"))
 end

spec/lib/emergency_contact_details_spec.rb

@@ -0,0 +1,40 @@
+require "rails_helper"
+
+describe EmergencyContactDetails do
+  describe ".fetch" do
+    it "returns a HashWithIndifferentAccess derived from `ENV['EMERGENCY_CONTACT_DETAILS']`" do
+      contact_details = {
+        "current_at": "2014-07-01",
+        "primary_contacts": {
+          "national_emergencies": {
+            "phone": "0555 555 555",
+          },
+        },
+        "secondary_contacts": [
+          {
+            "name": "Billy Director",
+            "role": "Director",
+            "phone": "05555 555 555",
+            "email": "billy.director@email.uk",
+          },
+        ],
+        "verify_contacts": {
+          "ida_support_email": "idasupport@email.uk",
+          "out_of_hours_email": "outofhours@email.uk",
+        },
+      }
+
+      allow(ENV).to receive(:[]).with(anything)
+      allow(ENV).to receive(:[]).with("EMERGENCY_CONTACT_DETAILS").and_return(contact_details.to_json)
+      expect(described_class.fetch).to eq(contact_details.to_h.with_indifferent_access)
+      expect(described_class.fetch[:verify_contacts][:ida_support_email]).to eq("idasupport@email.uk")
+    end
+
+    it "raises an exception if `ENV['EMERGENCY_CONTACT_DETAILS']` is not defined" do
+      allow(ENV).to receive(:[]).with(anything)
+      allow(ENV).to receive(:[]).with("EMERGENCY_CONTACT_DETAILS").and_return(nil)
+
+      expect { described_class.fetch }.to raise_exception(EmergencyContactDetails::MissingEnvVar)
+    end
+  end
+end