diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index fce9e1287..501a6835b 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -11,6 +11,6 @@ def content_item_path
                                  .compact
                                  .join('.')
 
-    '/' + URI.encode(path_and_optional_locale)
+    '/' + URI.encode(path_and_optional_locale) # rubocop:disable Lint/UriEscapeUnescape
   end
 end
diff --git a/app/controllers/content_items_controller.rb b/app/controllers/content_items_controller.rb
index 9ccad31f1..a3d0eb42d 100644
--- a/app/controllers/content_items_controller.rb
+++ b/app/controllers/content_items_controller.rb
@@ -1,5 +1,4 @@
 class ContentItemsController < ApplicationController
-
   rescue_from GdsApi::HTTPForbidden, with: :error_403
   rescue_from GdsApi::HTTPNotFound, with: :error_notfound
   rescue_from GdsApi::HTTPGone, with: :error_410
diff --git a/lib/helpers/document_types_helper.rb b/lib/helpers/document_types_helper.rb
index 368b9bc64..32a673355 100644
--- a/lib/helpers/document_types_helper.rb
+++ b/lib/helpers/document_types_helper.rb
@@ -1,8 +1,8 @@
 require 'rest-client'
 
 class DocumentTypesHelper
-  ALL_SEARCH_ENDPOINT = "https://www.gov.uk/api/search.json?facet_content_store_document_type=100,example_scope:global,examples:%{sample_size}&filter_rendering_app=government-frontend&count=0".freeze
-  SINGLE_SEARCH_ENDPOINT = "https://www.gov.uk/api/search.json?filter_content_store_document_type=%{document_type}&count=%{sample_size}".freeze
+  ALL_SEARCH_ENDPOINT = "https://www.gov.uk/api/search.json?facet_content_store_document_type=100,example_scope:global,examples:%<sample_size>s&filter_rendering_app=government-frontend&count=0".freeze
+  SINGLE_SEARCH_ENDPOINT = "https://www.gov.uk/api/search.json?filter_content_store_document_type=%<document_type>s&count=%<sample_size>s".freeze
 
   def initialize(sample_size = 10)
     @sample_size = sample_size
diff --git a/lib/helpers/wraith_config_helper.rb b/lib/helpers/wraith_config_helper.rb
index 61a9d76fa..dab61c377 100644
--- a/lib/helpers/wraith_config_helper.rb
+++ b/lib/helpers/wraith_config_helper.rb
@@ -2,7 +2,7 @@ class WraithConfigHelper
   attr_accessor :name, :paths
 
   TEMPLATE_PATH = "test/wraith/config.yaml".freeze
-  OUTPUT_PATH = 'test/wraith/wip-config-%{suffix}.yaml'.freeze
+  OUTPUT_PATH = 'test/wraith/wip-config-%<suffix>s.yaml'.freeze
 
   def initialize(name, paths)
     @name = name
@@ -20,7 +20,7 @@ def create_config(extra_config = {})
 private
 
   def load_template
-    YAML::load(File.open(TEMPLATE_PATH))
+    YAML::safe_load(File.open(TEMPLATE_PATH))
   end
 
   def build_paths
diff --git a/test/presenters/content_item/shareable_test.rb b/test/presenters/content_item/shareable_test.rb
index f653fc2af..6ebcfd07b 100644
--- a/test/presenters/content_item/shareable_test.rb
+++ b/test/presenters/content_item/shareable_test.rb
@@ -1,7 +1,8 @@
 require 'test_helper'
-include ERB::Util
 
 class ContentItemShareableTest < ActiveSupport::TestCase
+  include ERB::Util
+
   class DummyContentItem
     include ContentItem::Shareable
     attr_accessor :content_item, :title
diff --git a/test/presenters/travel_advice_presenter_test.rb b/test/presenters/travel_advice_presenter_test.rb
index 0d849b0e0..4b940076e 100644
--- a/test/presenters/travel_advice_presenter_test.rb
+++ b/test/presenters/travel_advice_presenter_test.rb
@@ -83,9 +83,7 @@ def schema_name
 
     test "navigation items are presented as trackable links unless they are the current part" do
       example = schema_item("full-country")
-      base_path = example["base_path"]
       current_part = example["details"]["parts"].first
-      another_part = example["details"]["parts"][1]
 
       first_part_presented = presented_item("full-country", current_part["slug"])
       navigation_items = first_part_presented.parts_navigation
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 2abbc2f16..e14f64b9d 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -2,7 +2,7 @@
 ENV['GOVUK_APP_DOMAIN'] = 'test.gov.uk'
 ENV['GOVUK_ASSET_ROOT'] = 'http://static.test.gov.uk'
 
-require File.expand_path('../../config/environment', __FILE__)
+require File.expand_path('../config/environment', __dir__)
 require 'rails/test_help'
 require 'capybara/rails'
 require 'mocha/minitest'