Extract country states logic out of subscriptions address controller into new service CountryStates

spec/javascripts/unit/admin/services/country_states_spec.js.coffee

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+describe "CountryStates service", ->
+  countryStates = null
+
+  states_in_spain = [{id: 55, name: "CAT", abbr: "CAT"}]
+  states_in_portugal = [{id: 55, name: "ACT", abbr: "ACT"}, {id: 5, name: "BFT", abbr: "BFT"}]
+  availableCountries = [
+    {id: 9, name: "Australia", states: []},
+    {id: 119, name: "Spain", states: states_in_spain},
+    {id: 19, name: "Portugal", states: states_in_portugal}
+  ]
+
+  beforeEach ->
+    module('ofn.admin')
+    inject (CountryStates) ->
+      countryStates = CountryStates
+
+  describe "statesFor", ->
+    it "returns empty array for nil country id", ->
+      expect(countryStates.statesFor(availableCountries, null)).toEqual []
+
+    it "returns empty array for country id not in availableCountries", ->
+      expect(countryStates.statesFor(availableCountries, 10)).toEqual []
+
+    it "returns empty array for country id in availableCountries but without states", ->
+      expect(countryStates.statesFor(availableCountries, 9)).toEqual []
+
+    it "returns states for country id in availableCountries with states", ->
+      expect(countryStates.statesFor(availableCountries, 119)).toEqual states_in_spain
+
+    it "returns empty array for country id (11) in availableCountries but only as part of other country id (119)", ->
+      expect(countryStates.statesFor(availableCountries, 11)).toEqual []
+
+    it "returns states for country id (19) in availableCountries with states even if other country ids contain the requested id (119)", ->
+      expect(countryStates.statesFor(availableCountries, 19)).toEqual states_in_portugal