Run a single test from a test suite.

test_runner.rb

#!/usr/bin/ruby
require 'tempfile'

if ARGV.size < 3
	# Example test_runner unit post "can delete"
	puts "usage: test_runner [type=unit,functional,integration] [testname] [testmethod]"
	exit
end

class TestRunner
	def initialize(options)
		@type = options[:type]
		@name = options[:name]
		@method = options[:method]
	end

	def run()
		testfile = "#{File.dirname(__FILE__)}/test/#{@type}/#{@name}_test.rb"
		if not File.exist?(testfile)
			puts "#{testfile} doesn't exist ..."
			return
		end

		testfile_contents = File.read(testfile)
		testfile_newcontents = testfile_contents.to_s

		testfile_contents.scan(/(test[\s].*?end)/m) do |match|
			unless match.to_s.match(@method)
				testfile_newcontents = testfile_newcontents.gsub(match.to_s,'')
			end
		end

		f = Tempfile.open('test')
		f.write(testfile_newcontents);
		f.close();

		# pluralize
		type = @type.gsub("unit","units").gsub("functional","functionals")

		system("rake test:#{type} TEST=#{f.path}")
	end
end

test = TestRunner.new(:type=>ARGV[0],:name=>ARGV[1],:method=>ARGV[2]);
test.run();