Setup code coverage with simplecov

spec/spec_helper.rb

@@ -2,6 +2,17 @@
 
 require 'nostr'
 require 'pry'
+require 'simplecov'
+require 'simplecov-console'
+
+SimpleCov.formatter = SimpleCov::Formatter::Console unless ENV['COVERAGE_FORMAT'] == 'html'
+
+unless ENV['COVERAGE'] == 'false'
+  SimpleCov.start do
+    root 'lib'
+    coverage_dir "#{Dir.pwd}/coverage"
+  end
+end
 
 RSpec.configure do |config|
   # Enable flags like --only-failures and --next-failure