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portfolio_spec.rb
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portfolio_spec.rb
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require 'minitest/spec'
require 'minitest/autorun'
require './portfolio'
describe Portfolio do
before do
@subject = Portfolio.new
@subject << 1
@subject << 2
@subject << 3
end
describe '#map' do
it 'does not modify the current array' do
@subject.map { |num| num + 1 }
@subject.accounts.must_equal [1, 2, 3]
end
it 'returns an array with values' do
result = @subject.map { |num| num + 1 }
result.must_equal [2, 3, 4]
end
end
describe '#select' do
it 'returns an array with values where condition is true' do
result = @subject.select { |num| num.even? }
result.must_equal [2]
end
end
describe '#reduce' do
it 'returns a single value when given an argument' do
result = @subject.reduce(1) { |sum, num| sum + num }
result.must_equal 7
end
it 'returns a single value when no argument is given' do
result = @subject.reduce { |sum, num| sum + num }
result.must_equal 6
end
it 'returns a single value when given a symbol' do
@subject.reduce(:*).must_equal 6
end
end
end