Add CLI Base class for command line code (#25106)

spec/lib/mastodon/cli/main_spec.rb

@@ -4,6 +4,12 @@ require 'rails_helper'
 require 'mastodon/cli/main'
 
 describe Mastodon::CLI::Main do
+  describe '.exit_on_failure?' do
+    it 'returns true' do
+      expect(described_class.exit_on_failure?).to be true
+    end
+  end
+
   describe 'version' do
     it 'returns the Mastodon version' do
       expect { described_class.new.invoke(:version) }.to output(