Fix to run under Ruby 2.6

And add as a requirement

dev.yml

@@ -3,7 +3,7 @@ name: theme-check
 type: ruby
 
 up:
-  - ruby: 2.7.1
+  - ruby: 2.6.6
   - bundler
 
 commands:

lib/theme_check/config.rb

@@ -91,7 +91,11 @@ def enabled_checks
 
         options_for_check = options.transform_keys(&:to_sym)
         options_for_check.delete(:enabled)
-        check = check_class.new(**options_for_check)
+        check = if options_for_check.empty?
+          check_class.new
+        else
+          check_class.new(**options_for_check)
+        end
         check.options = options_for_check
         check
       end.compact
@@ -104,7 +108,7 @@ def ignored_patterns
     private
 
     def check_name?(name)
-      name.start_with?(/[A-Z]/)
+      name.to_s.start_with?(/[A-Z]/)
     end
 
     def validate_configuration(configuration, default_configuration = self.class.default, parent_keys = [])

lib/theme_check/parsing_helpers.rb

@@ -6,7 +6,7 @@ def outside_of_strings(markup)
       scanner = StringScanner.new(markup)
 
       while scanner.scan(/.*?("|')/)
-        yield scanner.matched[..-2]
+        yield scanner.matched[0..-2]
         # Skip to the end of the string
         scanner.skip_until(scanner.matched[-1] == "'" ? /[^\\]'/ : /[^\\]"/)
       end

test/test_helper.rb

@@ -69,7 +69,7 @@ def initialize
       end
 
       def respond_to?(method)
-        method.start_with?("on_") || method.start_with?("after_") || super
+        method.to_s.start_with?("on_") || method.to_s.start_with?("after_") || super
       end
 
       def method_missing(method, node)

theme-check.gemspec

@@ -13,6 +13,8 @@ Gem::Specification.new do |spec|
   spec.homepage      = "https://github.com/Shopify/theme-check"
   spec.license       = "MIT"
 
+  spec.required_ruby_version = ">= 2.6"
+
   spec.metadata['allowed_push_host'] = 'https://rubygems.org'
 
   spec.files = Dir.chdir(File.expand_path('..', __FILE__)) do