1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
require 'spec_helper'
describe Immutable::Vector do
describe '#values_at' do
let(:vector) { V['a', 'b', 'c'] }
it 'accepts any number of indices, and returns a vector of items at those indices' do
vector.values_at(0).should eql(V['a'])
vector.values_at(1,2).should eql(V['b', 'c'])
end
context 'when passed invalid indices' do
it 'fills in with nils' do
vector.values_at(1,2,3).should eql(V['b', 'c', nil])
vector.values_at(-10,10).should eql(V[nil, nil])
end
end
context 'when passed no arguments' do
it 'returns an empty vector' do
vector.values_at.should eql(V.empty)
end
end
context 'from a subclass' do
it 'returns an instance of the subclass' do
subclass = Class.new(Immutable::Vector)
instance = subclass.new([1,2,3])
instance.values_at(1,2).class.should be(subclass)
end
end
end
end
|
