reimplement tests and minor fixes.

Rakefile

@@ -1,2 +1,9 @@
 require "bundler/gem_tasks"
 task :default => :spec
+
+require 'rake/testtask'
+Rake::TestTask.new :test do |test|
+  test.libs << 'lib' << 'test'
+  test.pattern = 'test/**/test_*.rb'
+  test.verbose = true
+end

test/helper.rb

@@ -1,5 +1,6 @@
 require 'rubygems'
 require 'bundler'
+
 begin
   Bundler.setup(:default, :development)
 rescue Bundler::BundlerError => e
@@ -7,6 +8,7 @@ rescue Bundler::BundlerError => e
   $stderr.puts "Run `bundle install` to install missing gems"
   exit e.status_code
 end
+
 require 'test/unit'
 require 'shoulda'
 
@@ -14,9 +16,6 @@ require 'timeout'
 require 'benchmark'
 require 'ffi/libc'
 
-$LOAD_PATH.unshift(File.join(File.dirname(__FILE__), '..', 'lib'))
-$LOAD_PATH.unshift(File.dirname(__FILE__))
-
 require 'timeout_interrupt'
 
 class Test::Unit::TestCase

test/test_ruby-timeout-interrupt.rb

@@ -4,7 +4,7 @@ class TestRubyTimeoutInterrupt < Test::Unit::TestCase
 	def blocking
 		t = FFI::LibC.fopen '/dev/ptmx', 'r'
 		b = FFI::LibC.malloc 1025
-		s = FFI::LibC.fread b, 1, 1024, t
+		FFI::LibC.fread b, 1, 1024, t
 	ensure
 		FFI::LibC.fclose t  if t
 		FFI::LibC.free b    if b
@@ -114,7 +114,7 @@ class TestRubyTimeoutInterrupt < Test::Unit::TestCase
 			called = false
 			prepared.call do
 				assert_raise TimeoutInterrupt::Error, 'It should time out after one second, but it did not.' do
-					prepared.call { 2; sleep 2 }
+					prepared.call { _ = 2; sleep 2 }
 				end
 				called = true
 			end