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require 'spec_helper'
describe Immutable::List do
describe '#indices' do
context 'when called with a block' do
it 'is lazy' do
count = 0
Immutable.stream { count += 1 }.indices { |item| true }
count.should <= 1
end
context "on a large list which doesn't contain desired item" do
it "doesn't blow the stack" do
-> { BigList.indices { |x| x < 0 }.size }.should_not raise_error
end
end
[
[[], 'A', []],
[['A'], 'B', []],
[%w[A B A], 'B', [1]],
[%w[A B A], 'A', [0, 2]],
[[2], 2, [0]],
[[2], 2.0, [0]],
[[2.0], 2.0, [0]],
[[2.0], 2, [0]],
].each do |values, item, expected|
context "looking for #{item.inspect} in #{values.inspect}" do
it "returns #{expected.inspect}" do
L[*values].indices { |x| x == item }.should eql(L[*expected])
end
end
end
end
context 'when called with a single argument' do
it 'is lazy' do
count = 0
Immutable.stream { count += 1 }.indices(nil)
count.should <= 1
end
[
[[], 'A', []],
[['A'], 'B', []],
[%w[A B A], 'B', [1]],
[%w[A B A], 'A', [0, 2]],
[[2], 2, [0]],
[[2], 2.0, [0]],
[[2.0], 2.0, [0]],
[[2.0], 2, [0]],
].each do |values, item, expected|
context "looking for #{item.inspect} in #{values.inspect}" do
it "returns #{expected.inspect}" do
L[*values].indices(item).should eql(L[*expected])
end
end
end
end
end
end
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