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
|
require 'spec_helper'
describe Immutable::List do
describe '#take' do
it 'is lazy' do
-> { Immutable.stream { fail }.take(1) }.should_not raise_error
end
[
[[], 10, []],
[['A'], 10, ['A']],
[['A'], -1, []],
[%w[A B C], 0, []],
[%w[A B C], 2, %w[A B]],
].each do |values, number, expected|
context "#{number} from #{values.inspect}" do
let(:list) { L[*values] }
it 'preserves the original' do
list.take(number)
list.should eql(L[*values])
end
it "returns #{expected.inspect}" do
list.take(number).should eql(L[*expected])
end
end
end
end
end
|
