Try to load WEBrick for testing

[voxik]

This is in similar vein Rake is optionally loaded in:

rdoc/test/rdoc/test_rdoc_task.rb

Lines 3 to 6 in 5437418

	begin
	require 'rake'
	rescue LoadError
	end

[voxik]

Actually, both would deserve if there was some message provided when the require fails 🤔 similarly to:

rdoc/test/rdoc/test_rdoc_i18n_locale.rb

Lines 31 to 36 in 5437418

	def test_load_existent_po
	begin
	require 'gettext/po_parser'
	rescue LoadError
	omit 'gettext gem is not found'
	end