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require "spec_helper"
require "hamster/vector"
describe Hamster::Vector do
describe "#empty?" do
[
[[], true],
[["A"], false],
[%w[A B C], false],
].each do |values, expected|
describe "on #{values.inspect}" do
it "returns #{expected.inspect}" do
V[*values].empty?.should == expected
end
end
end
end
describe ".empty" do
it "returns the canonical empty vector" do
V.empty.size.should be(0)
V.empty.object_id.should be(V.empty.object_id)
end
context "from a subclass" do
it "returns an empty instance of the subclass" do
subclass = Class.new(Hamster::Vector)
subclass.empty.class.should be(subclass)
subclass.empty.should be_empty
end
it "calls overridden #initialize when creating empty Hash" do
subclass = Class.new(Hamster::Vector) do
def initialize
@variable = 'value'
end
end
subclass.empty.instance_variable_get(:@variable).should == 'value'
end
end
end
end
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