require/installed_gems_newest_no_parens.rb

tests/_examples/require/installed_gems_newest_no_parens.rb in the metorex repository.

# With GEM_HOME naming a directory of installed gems, `require` finds a file
# no load path directory holds in the newest gem that has it, and activates
# that gem's dependencies first.
home = ENV.fetch("GEM_HOME")
p Gem.dir == home
p Gem.path.last == home
p Gem::Specification.find_all_by_name("shipping_rates").map(&:full_name)

require "shipping_rates"
p ShippingRates::VERSION
p ShippingRates.for(3)
p ShippingRates::ZONES
p Gem.loaded_specs.keys.sort & %w[shipping_rates tariff_table]
p $LOAD_PATH.any? { |entry| entry.end_with?("tariff_table-2.0.0/lib") }
p require("shipping_rates")