Refactor feature to avoid a broken step on Ruby 3.4

Author: JonRowe

features/command_line/init.feature

@@ -10,8 +10,7 @@ Feature: `--init` option
 
   Scenario: Generate `.rspec`
     When I run `rspec --init`
-    Then the following files should exist:
-      | .rspec |
+    Then the file `.rspec` should exist
     And the output should contain "create   .rspec"
 
   Scenario: `.rspec` file already exists

features/step_definitions/additional_cli_steps.rb

@@ -257,6 +257,12 @@
   end
 end
 
+Then /^the file `([^`]+)` should exist$/ do |file|
+  cd('.') do
+    File.exist?(file)
+  end
+end
+
 module Normalization
   def normalize_failure_output(text)
     whitespace_normalized = text.lines.map { |line| line.sub(/\s+$/, '').sub(/:in .*$/, '') }.join