Reorganize spec_helper; add support files for VCR and HTTPUNIXServer

spec/spec_helper.rb

 require 'simplecov'
 SimpleCov.start
 
-require 'vcr'
 require 'webmock'
-require 'webrick'
 
 require 'gitlab_init'
 
-VCR.configure do |c|
-  c.cassette_library_dir = 'spec/vcr_cassettes'
-  c.hook_into :webmock
-  c.configure_rspec_metadata!
-end
+Dir[File.expand_path('support/**/*.rb', __dir__)].each { |f| require f }
 
 RSpec.configure do |config|
+  config.run_all_when_everything_filtered = true
+  config.filter_run :focus
+
   config.before(:each) do
     stub_const('ROOT_PATH', File.expand_path('..', __dir__))
   end
 end
-
-# like WEBrick::HTTPServer, but listens on UNIX socket
-class HTTPUNIXServer < WEBrick::HTTPServer
-  def listen(address, port)
-    socket = Socket.unix_server_socket(address)
-    socket.autoclose = false
-    server = UNIXServer.for_fd(socket.fileno)
-    socket.close
-    @listeners << server
-  end
-
-  # Workaround:
-  # https://bugs.ruby-lang.org/issues/10956
-  # Affecting Ruby 2.2
-  # Fix for 2.2 is at https://github.com/ruby/ruby/commit/ab0a64e1
-  # However, this doesn't work with 2.1. The following should work for both:
-  def start(&block)
-    @shutdown_pipe = IO.pipe
-    shutdown_pipe = @shutdown_pipe
-    super(&block)
-  end
-
-  def cleanup_shutdown_pipe(shutdown_pipe)
-    @shutdown_pipe = nil
-    return if !shutdown_pipe
-    super(shutdown_pipe)
-  end
-end

spec/support/http_unix_server.rb

+require 'webrick'
+
+# like WEBrick::HTTPServer, but listens on UNIX socket
+class HTTPUNIXServer < WEBrick::HTTPServer
+  def listen(address, port)
+    socket = Socket.unix_server_socket(address)
+    socket.autoclose = false
+    server = UNIXServer.for_fd(socket.fileno)
+    socket.close
+    @listeners << server
+  end
+
+  # Workaround:
+  # https://bugs.ruby-lang.org/issues/10956
+  # Affecting Ruby 2.2
+  # Fix for 2.2 is at https://github.com/ruby/ruby/commit/ab0a64e1
+  # However, this doesn't work with 2.1. The following should work for both:
+  def start(&block)
+    @shutdown_pipe = IO.pipe
+    shutdown_pipe = @shutdown_pipe
+    super(&block)
+  end
+
+  def cleanup_shutdown_pipe(shutdown_pipe)
+    @shutdown_pipe = nil
+    return if !shutdown_pipe
+    super(shutdown_pipe)
+  end
+end

spec/support/vcr.rb

+require 'vcr'
+
+VCR.configure do |c|
+  c.cassette_library_dir = 'spec/vcr_cassettes'
+  c.hook_into :webmock
+  c.configure_rspec_metadata!
+end