add a default test task this way running "rake" will execute the tests

bindings/ruby/Rakefile

@@ -1,4 +1,5 @@
 require 'erb'
+require 'rake/testtask'
 require 'rubygems/package'
 
 BUILD_VERSION=1
@@ -9,6 +10,14 @@ else
   CURRENT_VERSION = "0.0.0.#{BUILD_VERSION}"
 end
 
+desc "Default Task (Test project)"
+task :default => :test
+
+Rake::TestTask.new(:test) do |t|
+  t.test_files = FileList['tests/test_*.rb']
+  t.verbose = false
+end
+
 desc 'Generate gem specification'
 task :gemspec do
   system("cp ../../LICENSE .")