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require "spec_helper"
require "hamster/set"
describe Hamster::Set do
describe "#none?" do
context "when empty" do
it "with a block returns true" do
S.empty.none? {}.should == true
end
it "with no block returns true" do
S.empty.none?.should == true
end
end
context "when not empty" do
context "with a block" do
let(:set) { S["A", "B", "C", nil] }
["A", "B", "C", nil].each do |value|
it "returns false if the block ever returns true (#{value.inspect})" do
set.none? { |item| item == value }.should == false
end
end
it "returns true if the block always returns false" do
set.none? { |item| item == "D" }.should == true
end
it "stops iterating as soon as the block returns true" do
yielded = []
set.none? { |item| yielded << item; true }
yielded.size.should == 1
end
end
context "with no block" do
it "returns false if any value is truthy" do
S[nil, false, true, "A"].none?.should == false
end
it "returns true if all values are falsey" do
S[nil, false].none?.should == true
end
end
end
end
end
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