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# Define a task library for running unit tests.

require 'rake'
require 'rake/tasklib'

module Rake

  # Create a task that runs a set of tests.
  #
  # Example:
  #
  #   Rake::TestTask.new do |t|
  #     t.libs << "test"
  #     t.test_files = FileList['test/test*.rb']
  #     t.verbose = true
  #   end
  #
  # If rake is invoked with a "TEST=filename" command line option,
  # then the list of test files will be overridden to include only the
  # filename specified on the command line.  This provides an easy way
  # to run just one test.
  #
  # If rake is invoked with a "TESTOPTS=options" command line option,
  # then the given options are passed to the test process after a
  # '--'.  This allows Test::Unit options to be passed to the test
  # suite.
  #
  # Examples:
  #
  #   rake test                           # run tests normally
  #   rake test TEST=just_one_file.rb     # run just one test file.
  #   rake test TESTOPTS="-v"             # run in verbose mode
  #   rake test TESTOPTS="--runner=fox"   # use the fox test runner
  #
  class TestTask < TaskLib

    # Name of test task. (default is :test)
    attr_accessor :name

    # List of directories to added to $LOAD_PATH before running the
    # tests. (default is 'lib')
    attr_accessor :libs

    # True if verbose test output desired. (default is false)
    attr_accessor :verbose

    # Test options passed to the test suite.  An explicit
    # TESTOPTS=opts on the command line will override this. (default
    # is NONE)
    attr_accessor :options

    # Request that the tests be run with the warning flag set.
    # E.g. warning=true implies "ruby -w" used to run the tests.
    attr_accessor :warning

    # Glob pattern to match test files. (default is 'test/test*.rb')
    attr_accessor :pattern

    # Style of test loader to use.  Options are:
    #
    # * :rake -- Rake provided test loading script (default).
    # * :testrb -- Ruby provided test loading script.
    # * :direct -- Load tests using command line loader.
    #
    attr_accessor :loader

    # Array of commandline options to pass to ruby when running test loader.
    attr_accessor :ruby_opts

    # Explicitly define the list of test files to be included in a
    # test.  +list+ is expected to be an array of file names (a
    # FileList is acceptable).  If both +pattern+ and +test_files+ are
    # used, then the list of test files is the union of the two.
    def test_files=(list)
      @test_files = list
    end

    # Create a testing task.
    def initialize(name=:test)
      @name = name
      @libs = ["lib"]
      @pattern = nil
      @options = nil
      @test_files = nil
      @verbose = false
      @warning = false
      @loader = :rake
      @ruby_opts = []
      yield self if block_given?
      @pattern = 'test/test*.rb' if @pattern.nil? && @test_files.nil?
      define
    end

    # Create the tasks defined by this task lib.
    def define
      desc "Run tests" + (@name == :test ? "" : " for #{@name}")
      task @name do
        FileUtilsExt.verbose(@verbose) do
          args =
            "#{ruby_opts_string} #{run_code} " +
            "#{file_list_string} #{option_list}"
          ruby args do |ok, status|
            if !ok && status.respond_to?(:signaled?) && status.signaled?
              raise SignalException.new(status.termsig)
            elsif !ok
              fail "Command failed with status (#{status.exitstatus}): " +
                "[ruby #{args}]"
            end
          end
        end
      end
      self
    end

    def option_list # :nodoc:
      (ENV['TESTOPTS'] ||
        ENV['TESTOPT'] ||
        ENV['TEST_OPTS'] ||
        ENV['TEST_OPT'] ||
        @options ||
        "")
    end

    def ruby_opts_string
      opts = @ruby_opts.dup
      opts.unshift("-I\"#{lib_path}\"") unless @libs.empty?
      opts.unshift("-w") if @warning
      opts.join(" ")
    end

    def lib_path
      @libs.join(File::PATH_SEPARATOR)
    end

    def file_list_string
      file_list.map { |fn| "\"#{fn}\"" }.join(' ')
    end

    def file_list # :nodoc:
      if ENV['TEST']
        FileList[ENV['TEST']]
      else
        result = []
        result += @test_files.to_a if @test_files
        result << @pattern if @pattern
        result
      end
    end

    def fix # :nodoc:
      case ruby_version
      when '1.8.2'
        "\"#{find_file 'rake/ruby182_test_unit_fix'}\""
      else
        nil
      end || ''
    end

    def ruby_version
      RUBY_VERSION
    end

    def run_code
      case @loader
      when :direct
        "-e \"ARGV.each{|f| require f}\""
      when :testrb
        "-S testrb #{fix}"
      when :rake
        "-I\"#{rake_lib_dir}\" \"#{rake_loader}\""
      end
    end

    def rake_loader # :nodoc:
      find_file('rake/rake_test_loader') or
        fail "unable to find rake test loader"
    end

    def find_file(fn) # :nodoc:
      $LOAD_PATH.each do |path|
        file_path = File.join(path, "#{fn}.rb")
        return file_path if File.exist? file_path
      end
      nil
    end

    def rake_lib_dir # :nodoc:
      find_dir('rake') or
        fail "unable to find rake lib"
    end

    def find_dir(fn) # :nodoc:
      $LOAD_PATH.each do |path|
        file_path = File.join(path, "#{fn}.rb")
        return path if File.exist? file_path
      end
      nil
    end

  end
end