Fix rubocop target version, io helpers, helper usage

Author: joemsak

spec/integration/plugin_helper_spec.rb

@@ -1,7 +1,7 @@
 RSpec.describe CodeTeams::Plugin, 'helper integration' do
   before do
     CodeTeams.bust_caches!
-    write_team_yml(extra_data: { foo: 'foo', bar: 'bar' })
+    write_team_yml(extra_data: { 'foo' => 'foo', 'bar' => 'bar' })
   end
 
   let(:team) { CodeTeams.find('My Team') }
@@ -25,7 +25,7 @@ def test_plugin
       end
 
       it 'supports nested data' do
-        write_team_yml(extra_data: { foo: { bar: 'bar' } })
+        write_team_yml(extra_data: { 'foo' => { 'bar' => 'bar' } })
         expect(team.test_plugin.foo['bar']).to eq('bar')
       end
 

spec/support/io_helpers.rb

@@ -1,9 +1,9 @@
 module IOHelpers
   def write_team_yml(extra_data: false)
-    write_file('config/teams/my_team.yml', <<~YML.strip)
-      name: My Team
-      extra_data: #{extra_data}
-    YML
+    write_file('config/teams/my_team.yml', YAML.dump({
+      name: 'My Team',
+      extra_data: extra_data
+    }.transform_keys(&:to_s)))
   end
 
   def write_file(path, content = '')