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require "spec_helper"
require "hamster/list"
describe Hamster::List do
[:reduce, :inject].each do |method|
describe "##{method}" do
context "on a really big list" do
it "doesn't run out of stack" do
-> { Hamster.interval(0, STACK_OVERFLOW_DEPTH).send(method, &:+) }.should_not raise_error
end
end
[
[[], 10, 10],
[[1], 10, 9],
[[1, 2, 3], 10, 4],
].each do |values, initial, expected|
context "on #{values.inspect}" do
context "with an initial value of #{initial} and a block" do
it "returns #{expected.inspect}" do
L[*values].send(method, initial) { |memo, item| memo - item }.should == expected
end
end
end
end
[
[[], nil],
[[1], 1],
[[1, 2, 3], -4],
].each do |values, expected|
context "on #{values.inspect}" do
context "with no initial value and a block" do
it "returns #{expected.inspect}" do
L[*values].send(method) { |memo, item| memo - item }.should == expected
end
end
end
end
context "with no block and a symbol argument" do
it "uses the symbol as the name of a method to reduce with" do
L[1, 2, 3].send(method, :+).should == 6
end
end
context "with no block and a string argument" do
it "uses the string as the name of a method to reduce with" do
L[1, 2, 3].send(method, '+').should == 6
end
end
end
end
end
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