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require "spec_helper"
require "hamster/sorted_set"
describe Hamster::SortedSet do
[:select, :find_all].each do |method|
describe "##{method}" do
let(:sorted_set) { SS["A", "B", "C"] }
context "when everything matches" do
it "preserves the original" do
sorted_set.send(method) { true }
sorted_set.should eql(SS["A", "B", "C"])
end
it "returns self" do
sorted_set.send(method) { |item| true }.should equal(sorted_set)
end
end
context "when only some things match" do
context "with a block" do
it "preserves the original" do
sorted_set.send(method) { |item| item == "A" }
sorted_set.should eql(SS["A", "B", "C"])
end
it "returns a set with the matching values" do
sorted_set.send(method) { |item| item == "A" }.should eql(SS["A"])
end
end
context "with no block" do
it "returns an Enumerator" do
sorted_set.send(method).class.should be(Enumerator)
sorted_set.send(method).each { |item| item == "A" }.should eql(SS["A"])
end
end
end
context "when nothing matches" do
it "preserves the original" do
sorted_set.send(method) { |item| false }
sorted_set.should eql(SS["A", "B", "C"])
end
it "returns the canonical empty set" do
sorted_set.send(method) { |item| false }.should equal(Hamster::EmptySortedSet)
end
end
context "from a subclass" do
it "returns an instance of the same class" do
subclass = Class.new(Hamster::SortedSet)
instance = subclass.new(['A', 'B', 'C'])
instance.send(method) { true }.class.should be(subclass)
instance.send(method) { false }.class.should be(subclass)
instance.send(method) { rand(2) == 0 }.class.should be(subclass)
end
end
end
end
end
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