require 'test/unit'
require 'rscm/tempdir'
require 'rscm/command_line'

module RSCM

  class DifftoolTest < Test::Unit::TestCase
    def setup
      @dir = RSCM.new_temp_dir("test_should_write_to_stdout")
      @stdout = "#{@dir}/stdout"
      @stderr = "#{@dir}/stderr"
      @prompt = "#{File.expand_path(@dir)} #{Platform.user}$"
      File.delete @stdout if File.exist? @stdout
      File.delete @stderr if File.exist? @stderr
    end

    def test_should_write_to_both_when_both_streams_specified_and_no_block
      CommandLine.execute("echo \"<hello\" && echo world", {:dir => @dir, :stdout => @stdout, :stderr => @stderr})
      assert_equal("#{@prompt} echo \"<hello\"\n<hello\n#{@prompt} echo world\nworld\n", File.open(@stdout).read)
      assert_equal("#{@prompt} echo \"<hello\"\n#{@prompt} echo world\n", File.open(@stderr).read)
    end
    
    def test_should_not_write_to_stdout_when_no_stdout_specified
      CommandLine.execute("echo hello", {:dir => @dir, :stderr => @stderr})
      assert(!File.exist?(@stdout))
      assert_equal("#{@prompt} echo hello\n", File.open(@stderr).read)
    end
    
    def test_should_only_write_command_to_stdout_when_block_specified
      CommandLine.execute("echo hello", {:dir => @dir, :stdout => @stdout, :stderr => @stderr}) do |io|
        assert_equal("hello\n", io.read)
      end
      assert_equal("#{@prompt} echo hello\n[output captured and therefore not logged]\n", File.open(@stdout).read)
      assert_equal("#{@prompt} echo hello\n", File.open(@stderr).read)
    end
    
  end
end