以下のようなRakefileも機能すると思います(上記のコマンドよりも簡単です)。ただし、これがテストに必要であることは明らかではありません。
require 'rake/testtask'
require 'rake/clean'
NAME = 'hola'
# rule to build the extension: this says
# that the extension should be rebuilt
# after any change to the files in ext
file "lib/#{NAME}/#{NAME}.so" =>
Dir.glob("ext/#{NAME}/*{.rb,.c}") do
Dir.chdir("ext/#{NAME}") do
# this does essentially the same thing
# as what RubyGems does
ruby "extconf.rb"
sh "make"
end
cp "ext/#{NAME}/#{NAME}.so", "lib/#{NAME}"
end
# make the :test task depend on the shared
# object, so it will be built automatically
# before running the tests
task :test => "lib/#{NAME}/#{NAME}.so"
# use 'rake clean' and 'rake clobber' to
# easily delete generated files
CLEAN.include('ext/**/*{.o,.log,.so}')
CLEAN.include('ext/**/Makefile')
CLOBBER.include('lib/**/*.so')
# the same as before
Rake::TestTask.new do |t|
t.libs << 'test'
end
desc "Run tests"
task :default => :test