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require "spec_helper"
require "hamster/list"
describe Hamster::List do
describe "#grep" do
it "is lazy" do
-> { Hamster.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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