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require 'spec_helper'
describe Immutable::Vector do
describe '#take' do
[
[[], 10, []],
[['A'], 10, ['A']],
[%w[A B C], 0, []],
[%w[A B C], 2, %w[A B]],
[(1..32), 1, [1]],
[(1..33), 32, (1..32)],
[(1..100), 40, (1..40)]
].each do |values, number, expected|
describe "#{number} from #{values.inspect}" do
let(:vector) { V[*values] }
it 'preserves the original' do
vector.take(number)
vector.should eql(V[*values])
end
it "returns #{expected.inspect}" do
vector.take(number).should eql(V[*expected])
end
end
end
context 'when number of elements specified is identical to size' do
let(:vector) { V[1, 2, 3, 4, 5, 6] }
it 'returns self' do
vector.take(vector.size).should be(vector)
end
end
context 'when number of elements specified is bigger than size' do
let(:vector) { V[1, 2, 3, 4, 5, 6] }
it 'returns self' do
vector.take(vector.size + 1).should be(vector)
end
end
end
end
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