From: James Edward Gray II <james@...>
Date: 2006-08-31T02:27:22+09:00
Subject: Re: [QUIZ] DayRange (#92) Test::Unit gotcha

On Aug 30, 2006, at 11:55 AM, Morton Goldberg wrote:

> Could you post an example showing how setup and teardown could be  
> used to avoid the trap I fell into?

Here's my modification to your tests to get them working with setup():

class TestDayRange < Test::Unit::TestCase

    # All these produce @days == [1..7].
    ONE_RANGE = [
       %w[mon tue wed thu fri sat sun],
       %w[monDay tuesday Wednesday Thursday friDAY saturday SUNDAY],
       %w[mon-fri sat-sun],
       %w[4-7 1-3],
       (1..7).to_a.reverse,
       [4, 7, 6, 5, 4, 1, 2, 1, 2, 3, 3, 7, 6, 5],
    ]

    # Both these produce @days == [1..3, 5..7].
    TWO_RANGES = [
       %w[mon-mon tue-tue wed-wed fri-sun],
       [1, 2, 'mon-wed', 'friday', 6, 7]
    ]

    INVALID_ARGS = [
       [1, 2, 'foo'],
       %w[foo-bar],
       %w[sat-mon],
       (0..7).to_a.reverse,
       (1..8).to_a
    ]

    def setup
      assert_nothing_raised(ArgumentError) do
        @one_range = ONE_RANGE.map { |args| DayRange.new(*args) }
      end
      assert_nothing_raised(ArgumentError) do
        @two_ranges = TWO_RANGES.map { |args| DayRange.new(*args) }
      end
    end

    def test_valid_args
       @one_range.each do |obj|
          assert_expected_days([1..7], obj)
       end
       @two_ranges.each do |obj|
          assert_expected_days([1..3, 5..7], obj)
       end
    end

    def test_bad_args
       INVALID_ARGS.each do |args|
          assert_raise(ArgumentError) { DayRange.new(*args) }
       end
    end

    def test_to_s
       @one_range.each do |obj|
          assert_equal('Mon-Sun', obj.to_s)
       end
       @two_ranges.each do |obj|
          assert_equal('Mon-Wed, Fri-Sun', obj.to_s)
       end
    end

    def test_to_a
       @one_range.each do |obj|
          assert_equal((1..7).to_a, obj.to_a)
       end
       @two_ranges.each do |obj|
          assert_equal([1, 2, 3, 5, 6, 7], obj.to_a)
       end
    end

    private

    def assert_expected_days(expected, day_range)
      assert_equal(expected, day_range.instance_variable_get(:@days))
    end

end

James Edward Gray II