Fix bug in subscriptions address controller where the country id lookup was not exact and states returned were incorrect. Add unit tests to cover different cases

spec/javascripts/unit/admin/controllers/providers_controller_spec.js.coffee

@@ -0,0 +1,30 @@
+describe "ProvidersCtrl", ->
+  ctrl = null
+  scope = null
+  paymentMethod = null
+
+  describe "initialising using a payment method without a type", ->
+    beforeEach ->
+      module 'admin.paymentMethods'
+      scope = {}
+      paymentMethod =
+        type: null
+
+      inject ($controller)->
+        ctrl = $controller 'ProvidersCtrl', {$scope: scope, paymentMethod: paymentMethod }
+
+    it "sets the invlude_html porperty on scope to blank", ->
+      expect(scope.include_html).toBe ""
+
+  describe "initialising using a payment method with a type", ->
+    beforeEach ->
+      module 'admin.paymentMethods'
+      scope = {}
+      paymentMethod =
+        type: "NOT NULL"
+
+      inject ($controller)->
+        ctrl = $controller 'ProvidersCtrl', {$scope: scope, paymentMethod: paymentMethod }
+
+    it "sets the include_html porperty on scope to some address", ->
+      expect(scope.include_html).toBe "/admin/payment_methods/show_provider_preferences?provider_type=NOT NULL;pm_id=#{paymentMethod.id};"