diff --git a/features/step_definitions/steps.rb b/features/step_definitions/steps.rb
index 04262a8..0bd3ae6 100644
--- a/features/step_definitions/steps.rb
+++ b/features/step_definitions/steps.rb
@@ -1,9 +1,10 @@
+# frozen_string_literal: true
+
 # BEFORE
 Before('@db-test') do
-  @links = Sequel.sqlite("db/#{ENV['DB_NAME']}")[:links]
+  @links = Sequel.sqlite("db/#{ENV.fetch('DB_NAME', nil)}")[:links]
 end
 
-
 # GIVEN
 
 Given('I visit the {string} page') do |string|
@@ -11,18 +12,17 @@ Given('I visit the {string} page') do |string|
 end
 
 Given('A link already exists with the url {string}') do |string|
-  @links.insert(url: string, code: "aaaaaa")
+  @links.insert(url: string, code: 'aaaaaa')
 end
 
 Given('A link already exists with the url {string} and code {string}') do |url, code|
-  @links.insert(url: url, code: code)
+  @links.insert(url:, code:)
 end
 
-
 # WHEN
 
 When('I click the {string} button') do |string|
-  click_button {string}
+  click_button { string }
 end
 
 When('I type {string} in the {string} field') do |text, field|
@@ -33,7 +33,6 @@ When('I visit the {string} location') do |string|
   visit string
 end
 
-
 # THEN
 
 Then('I should see text {string}') do |string|
@@ -66,7 +65,6 @@ Then('The status code should be {int}') do |code|
   page.status_code.should eq(code)
 end
 
-
 # AFTER
 
 After('@db-test') do