Upgrade rubocop

test/integration/assign_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class AssignTest < Minitest::Test
@@ -10,29 +12,29 @@ class AssignTest < Minitest::Test
     END_TEMPLATE
     template = Template.parse(template_source)
     rendered = template.render!
-    assert_equal "Print this-thing", rendered.strip
+    assert_equal 'Print this-thing', rendered.strip
   end
 
   def test_assigned_variable
     assert_template_result('.foo.',
-      '{% assign foo = values %}.{{ foo[0] }}.',
-      'values' => %w(foo bar baz))
+                           '{% assign foo = values %}.{{ foo[0] }}.',
+                           'values' => %w[foo bar baz])
 
     assert_template_result('.bar.',
-      '{% assign foo = values %}.{{ foo[1] }}.',
-      'values' => %w(foo bar baz))
+                           '{% assign foo = values %}.{{ foo[1] }}.',
+                           'values' => %w[foo bar baz])
   end
 
   def test_assign_with_filter
     assert_template_result('.bar.',
-      '{% assign foo = values | split: "," %}.{{ foo[1] }}.',
-      'values' => "foo,bar,baz")
+                           '{% assign foo = values | split: "," %}.{{ foo[1] }}.',
+                           'values' => 'foo,bar,baz')
   end
 
   def test_assign_syntax_error
     assert_match_syntax_error(/assign/,
-      '{% assign foo not values %}.',
-      'values' => "foo,bar,baz")
+                              '{% assign foo not values %}.',
+                              'values' => 'foo,bar,baz')
   end
 
   def test_assign_uses_error_mode