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require 'spec_helper'
describe Immutable::List do
describe '#grep' do
it 'is lazy' do
-> { Immutable.stream { fail }.grep(Object) { |item| item } }.should_not raise_error
end
context 'without a block' do
[
[[], []],
[['A'], ['A']],
[[1], []],
[['A', 2, 'C'], %w[A C]],
].each do |values, expected|
context "on #{values.inspect}" do
it "returns #{expected.inspect}" do
L[*values].grep(String).should eql(L[*expected])
end
end
end
end
context 'with a block' do
[
[[], []],
[['A'], ['a']],
[[1], []],
[['A', 2, 'C'], %w[a c]],
].each do |values, expected|
context "on #{values.inspect}" do
let(:list) { L[*values] }
it 'preserves the original' do
list.grep(String, &:downcase)
list.should eql(L[*values])
end
it "returns #{expected.inspect}" do
list.grep(String, &:downcase).should eql(L[*expected])
end
end
end
end
end
end
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