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require 'spec_helper'
describe Immutable::Vector do
describe '#*' do
let(:vector) { V[1, 2, 3] }
context 'with a String argument' do
it 'acts just like #join' do
(vector * 'boo').should eql(vector.join('boo'))
end
end
context 'with an Integer argument' do
it 'concatenates n copies of the array' do
(vector * 0).should eql(V.empty)
(vector * 1).should eql(vector)
(vector * 2).should eql(V[1,2,3,1,2,3])
(vector * 3).should eql(V[1,2,3,1,2,3,1,2,3])
end
it 'raises an ArgumentError if integer is negative' do
-> { vector * -1 }.should raise_error(ArgumentError)
end
it 'works on large vectors' do
array = (1..50).to_a
(V.new(array) * 25).should eql(V.new(array * 25))
end
end
context 'with a subclass of Vector' do
it 'returns an instance of the subclass' do
subclass = Class.new(Immutable::Vector)
instance = subclass.new([1,2,3])
(instance * 10).class.should be(subclass)
end
end
it 'raises a TypeError if passed nil' do
-> { vector * nil }.should raise_error(TypeError)
end
it 'raises an ArgumentError if passed no arguments' do
-> { vector.* }.should raise_error(ArgumentError)
end
end
end
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