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require "spec_helper"
require "hamster/vector"
describe Hamster::Vector do
let(:vector) { V[*values] }
[:add, :<<, :push].each do |method|
describe "##{method}" do
shared_examples "checking adding values" do
let(:added_vector) { V[*added_values] }
it "preserves the original" do
original = vector
vector.send(method, added_value)
expect(original).to eq(vector)
end
it "adds the item to the vector" do
result = vector.send(method, added_value)
expect(result).to eq(added_vector)
expect(result.size).to eq(vector.size + 1)
end
end
context "with a empty vector adding a single item" do
let(:values) { [] }
let(:added_value) { "A" }
let(:added_values) { ["A"] }
include_examples "checking adding values"
end
context "with a single-item vector adding a different item" do
let(:values) { ["A"] }
let(:added_value) { "B" }
let(:added_values) { %w[A B] }
include_examples "checking adding values"
end
context "with a single-item vector adding a duplicate item" do
let(:values) { ["A"] }
let(:added_value) { "A" }
let(:added_values) { %w[A A] }
include_examples "checking adding values"
end
[31, 32, 33, 1023, 1024, 1025].each do |size|
context "with a #{size}-item vector adding a different item" do
let(:values) { (1..size).to_a }
let(:added_value) { size+1 }
let(:added_values) { (1..(size+1)).to_a }
include_examples "checking adding values"
end
end
context "from a subclass" do
it "returns an instance of the subclass" do
subclass = Class.new(Hamster::Vector)
instance = subclass[1,2,3]
instance.add(4).class.should be(subclass)
end
end
end
end
end
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