check map#contains matches json schema in spec

Gemfile

@@ -43,6 +43,7 @@ group :test do
   gem 'factory_girl_rails'
   gem 'shoulda-matchers'
   gem 'simplecov', require: false
+  gem 'json-schema'
 end
 
 group :production do #this is used on heroku

Gemfile.lock

@@ -36,6 +36,7 @@ GEM
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
+    addressable (2.3.8)
     arel (6.0.3)
     aws-sdk (1.66.0)
       aws-sdk-v1 (= 1.66.0)
@@ -105,6 +106,8 @@ GEM
     jquery-ui-rails (5.0.5)
       railties (>= 3.2.16)
     json (1.8.3)
+    json-schema (2.6.0)
+      addressable (~> 2.3.8)
     kaminari (0.16.3)
       actionpack (>= 3.0.0)
       activesupport (>= 3.0.0)
@@ -251,6 +254,7 @@ DEPENDENCIES
   jquery-rails
   jquery-ui-rails
   json
+  json-schema
   kaminari
   paperclip
   pg

spec/controllers/maps_controller_spec.rb

@@ -15,6 +15,14 @@ RSpec.describe MapsController, type: :controller do
     end
   end
 
+  describe 'GET #contains' do
+    it 'returns json matching schema' do
+      get :contains, { id: map.to_param, format: :json }
+      # get "maps/#{map.id}/contains"
+      expect(response.body).to match_json_schema(:map_contains)
+    end
+  end
+
   describe 'GET #show' do
     it 'assigns the requested map as @map' do
       get :show, { id: map.to_param }

spec/schemas/map_contains.json

@@ -0,0 +1,42 @@
+{
+  "name": "Map Contents",
+  "type": "object",
+  "properties": {
+    "map": {
+      "type": "object"
+    },
+    "topics": {
+      "type": "array",
+      "items": {
+        "type": "object"
+      }
+    },
+    "synapses": {
+      "type": "array",
+      "items": {
+        "type": "object"
+      }
+    },
+    "mappings": {
+      "type": "array",
+      "items": {
+        "type": "object"
+      }
+    },
+    "mappers": {
+      "type": "array",
+      "items": {
+        "type": "object"
+      }
+    }
+  },
+  "required": [
+    "map",
+    "topics",
+    "synapses",
+    "mappings",
+    "mappers"
+  ]
+}
+
+

spec/support/schema_matcher.rb

@@ -0,0 +1,7 @@
+RSpec::Matchers.define :match_json_schema do |schema|
+  match do |json|
+    schema_directory = Rails.root.join('spec', 'schemas').to_s
+    schema_path = "#{schema_directory}/#{schema}.json"
+    JSON::Validator.validate!(schema_path, json)
+  end
+end