Move dev deps to gemspec

Author: pirj

Gemfile

@@ -31,15 +31,11 @@ gem 'ffi', '~> 1.12.0'
 
 gem "jruby-openssl", platforms: :jruby
 
-gem 'simplecov', '~> 0.8'
-
 # No need to run rubocop on earlier versions
 if RUBY_VERSION >= '2.4' && RUBY_ENGINE == 'ruby'
   gem "rubocop", "~> 0.52.1"
 end
 
-gem 'test-unit', '~> 3.0'
-
 # Version 5.12 of minitest requires Ruby 2.4
 if RUBY_VERSION < '2.4.0'
   gem 'minitest', '< 5.12.0'

rspec-core.gemspec

@@ -44,9 +44,12 @@ Gem::Specification.new do |s|
     s.add_runtime_dependency "rspec-support", "~> #{RSpec::Core::Version::STRING.split('.')[0..1].concat(['3']).join('.')}"
   end
 
+  s.add_development_dependency "aruba",    "~> 0.14.9"
   s.add_development_dependency "cucumber", "~> 1.3"
   s.add_development_dependency "minitest", "~> 5.3"
-  s.add_development_dependency "aruba",    "~> 0.14.9"
+  s.add_development_dependency "test-unit", "~> 3.0"
+
+  s.add_development_dependency "simplecov", "~> 0.8"
 
   s.add_development_dependency "coderay",  "~> 1.1.1"