62 lines
1.8 KiB
Ruby
62 lines
1.8 KiB
Ruby
require File.dirname(__FILE__) + '/../abstract_unit'
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Payment = Struct.new(:price)
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class SummablePayment < Payment
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def +(p) self.class.new(price + p.price) end
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end
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class EnumerableTests < Test::Unit::TestCase
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def test_group_by
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names = %w(marcel sam david jeremy)
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klass = Class.new
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klass.send(:attr_accessor, :name)
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objects = (1..50).inject([]) do |people,|
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p = klass.new
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p.name = names.sort_by { rand }.first
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people << p
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end
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objects.group_by {|object| object.name}.each do |name, group|
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assert group.all? {|person| person.name == name}
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end
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end
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def test_sums
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assert_equal 30, [5, 15, 10].sum
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assert_equal 30, [5, 15, 10].sum { |i| i }
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assert_equal 'abc', %w(a b c).sum
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assert_equal 'abc', %w(a b c).sum { |i| i }
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payments = [ Payment.new(5), Payment.new(15), Payment.new(10) ]
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assert_equal 30, payments.sum(&:price)
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assert_equal 60, payments.sum { |p| p.price * 2 }
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payments = [ SummablePayment.new(5), SummablePayment.new(15) ]
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assert_equal SummablePayment.new(20), payments.sum
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assert_equal SummablePayment.new(20), payments.sum { |p| p }
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end
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def test_nil_sums
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assert_raise(TypeError) { [5, 15, nil].sum }
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payments = [ Payment.new(5), Payment.new(15), Payment.new(10), Payment.new(nil) ]
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assert_raise(TypeError) { payments.sum(&:price) }
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assert_equal 60, payments.sum { |p| p.price.to_i * 2 }
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end
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def test_empty_sums
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assert_equal 0, [].sum
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assert_equal 0, [].sum { |i| i }
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assert_equal Payment.new(0), [].sum(Payment.new(0))
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end
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def test_index_by
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payments = [ Payment.new(5), Payment.new(15), Payment.new(10) ]
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assert_equal(
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{5 => payments[0], 15 => payments[1], 10 => payments[2]},
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payments.index_by(&:price)
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)
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end
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end
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