Move development dependencies to Gemfile

Author: pirj

Gemfile

@@ -36,6 +36,20 @@ 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'
+else
+  gem "minitest", "~> 5.3"
 end
 
+gem "cucumber", "~> 3.2.0"
+gem "aruba",    "~> 0.14.9"
+
+gem "coderay",  "~> 1.1.1"
+
+gem "mocha",        "~> 0.13.0"
+gem "rr",           "~> 3.0.0"
+gem "flexmock",     "~> 0.9.0"
+gem "thread_order", "~> 1.1.0"
+
+gem "rake", "~> 12.3.2"
+
 eval File.read('Gemfile-custom') if File.exist?('Gemfile-custom')

rspec-core.gemspec

@@ -43,17 +43,4 @@ Gem::Specification.new do |s|
     # rspec-support must otherwise match our major/minor version
     s.add_runtime_dependency "rspec-support", "~> #{RSpec::Core::Version::STRING.split('.')[0..1].concat(['3']).join('.')}"
   end
-
-  s.add_development_dependency "cucumber", "~> 3.2.0"
-  s.add_development_dependency "minitest", "~> 5.3"
-  s.add_development_dependency "aruba",    "~> 0.14.9"
-
-  s.add_development_dependency "coderay",  "~> 1.1.1"
-
-  s.add_development_dependency "mocha",        "~> 0.13.0"
-  s.add_development_dependency "rr",           "~> 3.0.0"
-  s.add_development_dependency "flexmock",     "~> 0.9.0"
-  s.add_development_dependency "thread_order", "~> 1.1.0"
-
-  s.add_development_dependency "rake", "~> 12.3.2"
 end