add graphql rspec helper

spec/graphql/queries/show_event_spec.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require 'rails_helper'
+require 'graphql_helper'
 
 RSpec.describe 'Events' do
 
@@ -20,10 +21,8 @@
       GRAPHQL
 
     result = WebsiteOneBackendApiSchema.execute(query_string)["data"]["events"]
-
-    names = result.collect {|x| x["name"]}
-
-    assert names.detect { |e| e == 'FirstEvent' }
-    assert names.detect { |e| e == 'AnotherEvent' }
+
+    expect(result).to json_contains('FirstEvent', 'name')
+    expect(result).to json_contains('AnotherEvent', 'name')
   end
 end

spec/graphql_helper.rb

@@ -0,0 +1,6 @@
+RSpec::Matchers.define :json_contains do |expected, key|
+    match do |actual|
+      a = actual.collect {|x| x[key]}
+      a.detect { |e| e == expected }
+    end
+end