Ruby: generate tests for cmdline

pkgs/ruby/.rubocop.yml

@@ -42,6 +42,10 @@ RSpec/FilePath:
 RSpec/ExampleLength:
   CountAsOne: ['array', 'hash', 'heredoc']
 
+Security/Eval:
+  Exclude:
+    - 'spec/**/*_spec.rb'
+
 Style/AndOr:
   EnforcedStyle: conditionals
 

pkgs/ruby/spec/lib/kernaux/cmdline_spec.rb

@@ -90,4 +90,23 @@ KernAux::Version.supports_cmdline? and RSpec.describe KernAux, '.cmdline' do
         raise_error described_class::CmdlineError, 'buffer overflow'
     end
   end
+
+  context 'using common tests' do
+    cmdline_yml = File.expand_path('../../../../../common/cmdline.yml', __dir__)
+
+    YAML.safe_load_file(cmdline_yml).each do |test|
+      next unless test['argv_count_max'].nil? && test['buffer_size'].nil?
+
+      escape_str = lambda do |str|
+        eval "\"#{str}\"", binding, __FILE__, __LINE__ # "str"
+      end
+
+      cmdline = escape_str.call test['cmdline']
+      result  = test['result'].map(&escape_str)
+
+      it "transforms #{cmdline.inspect} to #{result.inspect}" do
+        expect(described_class.cmdline(cmdline)).to eq result
+      end
+    end
+  end
 end