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require 'test/unit'
require File.dirname(__FILE__) + '/../../lib/active_support/core_ext/symbol'
require File.dirname(__FILE__) + '/../../lib/active_support/core_ext/enumerable'
Payment = Struct.new(:price)
class EnumerableTests < Test::Unit::TestCase
def test_group_by
names = %w(marcel sam david jeremy)
klass = Class.new
klass.send(:attr_accessor, :name)
objects = (1..50).inject([]) do |people,|
p = klass.new
p.name = names.sort_by { rand }.first
people << p
end
objects.group_by {|object| object.name}.each do |name, group|
assert group.all? {|person| person.name == name}
end
end
def test_sums
payments = [ Payment.new(5), Payment.new(15), Payment.new(10) ]
assert_equal 30, payments.sum(&:price)
assert_equal 60, payments.sum { |p| p.price * 2 }
end
def test_index_by
payments = [ Payment.new(5), Payment.new(15), Payment.new(10) ]
assert_equal(
{5 => payments[0], 15 => payments[1], 10 => payments[2]},
payments.index_by(&:price)
)
end
end
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