Add and apply Rails/ResponseParsedBody rubocop rule

This rule was introduced in rubocop-rails 2.18.0.

Since using `response.parsed_body` is shorter than using
`JSON.parse(response.body)`, this also means we can group some lines in
one.

.rubocop.yml

@@ -408,6 +408,9 @@ Rails/RelativeDateConstant:
 Rails/RequestReferer:
   Enabled: true
 
+Rails/ResponseParsedBody:
+  Enabled: true
+
 Rails/ReversibleMigration:
   Enabled: true
 

spec/controllers/admin/api/stats_controller_spec.rb

@@ -29,9 +29,7 @@ describe Admin::Api::StatsController, :admin do
         get :show, params: { event: "foo" }
 
         expect(response).to be_ok
-
+        expect(response.parsed_body).to eq "x" => ["2015-01-01", "2015-01-02"], "Foo" => [2, 1]
-        data = JSON.parse(response.body)
-        expect(data).to eq "x" => ["2015-01-01", "2015-01-02"], "Foo" => [2, 1]
       end
     end
 
@@ -47,9 +45,7 @@ describe Admin::Api::StatsController, :admin do
         get :show, params: { visits: true }
 
         expect(response).to be_ok
-
+        expect(response.parsed_body).to eq "x" => ["2015-01-01", "2015-01-02"], "Visits" => [2, 1]
-        data = JSON.parse(response.body)
-        expect(data).to eq "x" => ["2015-01-01", "2015-01-02"], "Visits" => [2, 1]
       end
     end
 
@@ -65,9 +61,7 @@ describe Admin::Api::StatsController, :admin do
         get :show, params: { budget_investments: true }
 
         expect(response).to be_ok
-
+        expect(response.parsed_body).to eq "x" => ["2017-04-01", "2017-04-02"], "Budget Investments" => [1, 2]
-        data = JSON.parse(response.body)
-        expect(data).to eq "x" => ["2017-04-01", "2017-04-02"], "Budget Investments" => [1, 2]
       end
     end
   end

spec/controllers/graphql_controller_spec.rb

@@ -16,7 +16,7 @@ describe GraphqlController, type: :request do
       get "/graphql", params: { query: "{ proposal(id: #{proposal.id}) { title } }" }
 
       expect(response).to have_http_status(:ok)
-      expect(JSON.parse(response.body)["data"]["proposal"]["title"]).to eq(proposal.title)
+      expect(response.parsed_body["data"]["proposal"]["title"]).to eq(proposal.title)
     end
 
     specify "with malformed query string" do
@@ -30,7 +30,7 @@ describe GraphqlController, type: :request do
       get "/graphql"
 
       expect(response).to have_http_status(:bad_request)
-      expect(JSON.parse(response.body)["message"]).to eq("Query string not present")
+      expect(response.parsed_body["message"]).to eq("Query string not present")
     end
   end
 
@@ -42,7 +42,7 @@ describe GraphqlController, type: :request do
                        headers: json_headers
 
       expect(response).to have_http_status(:ok)
-      expect(JSON.parse(response.body)["data"]["proposal"]["title"]).to eq(proposal.title)
+      expect(response.parsed_body["data"]["proposal"]["title"]).to eq(proposal.title)
     end
 
     specify "with raw query string inside body" do
@@ -51,7 +51,7 @@ describe GraphqlController, type: :request do
                        headers: graphql_headers
 
       expect(response).to have_http_status(:ok)
-      expect(JSON.parse(response.body)["data"]["proposal"]["title"]).to eq(proposal.title)
+      expect(response.parsed_body["data"]["proposal"]["title"]).to eq(proposal.title)
     end
 
     specify "with malformed query string" do
@@ -65,7 +65,7 @@ describe GraphqlController, type: :request do
       post "/graphql", headers: json_headers
 
       expect(response).to have_http_status(:bad_request)
-      expect(JSON.parse(response.body)["message"]).to eq("Query string not present")
+      expect(response.parsed_body["message"]).to eq("Query string not present")
     end
   end
 

spec/controllers/installation_controller_spec.rb

@@ -22,8 +22,8 @@ describe InstallationController, type: :request do
       get "/consul.json"
 
       expect(response).to have_http_status(:ok)
-      expect(JSON.parse(response.body)["release"]).not_to be_empty
+      expect(response.parsed_body["release"]).not_to be_empty
-      expect(JSON.parse(response.body)["features"]).to eq(test_process_settings)
+      expect(response.parsed_body["features"]).to eq(test_process_settings)
     end
   end
 end