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require 'test_helper'
require "uber/inheritable_attr"
class InheritableAttrTest < Minitest::Spec
describe "::inheritable_attr" do
subject {
Class.new(Object) do
extend Uber::InheritableAttribute
inheritable_attr :drinks
inheritable_attr :glass
inheritable_attr :guests, clone: false
end
}
def assert_nothing_raised(*)
yield
end
it "provides a reader with empty inherited attributes, already" do
assert_equal nil, subject.drinks
end
it "provides a reader with empty inherited attributes in a derived class" do
assert_equal nil, Class.new(subject).drinks
#subject.drinks = true
#Class.new(subject).drinks # TODO: crashes.
end
it "provides an attribute copy in subclasses" do
subject.drinks = []
assert subject.drinks.object_id != Class.new(subject).drinks.object_id
end
it "provides a writer" do
subject.drinks = [:cabernet]
assert_equal [:cabernet], subject.drinks
end
it "inherits attributes" do
subject.drinks = [:cabernet]
subklass_a = Class.new(subject)
subklass_a.drinks << :becks
subklass_b = Class.new(subject)
assert_equal [:cabernet], subject.drinks
assert_equal [:cabernet, :becks], subklass_a.drinks
assert_equal [:cabernet], subklass_b.drinks
end
it "does not inherit attributes if we set explicitely" do
subject.drinks = [:cabernet]
subklass = Class.new(subject)
subklass.drinks = [:merlot] # we only want merlot explicitely.
assert_equal [:merlot], subklass.drinks # no :cabernet, here
end
it "respects clone: false" do
subject.guests = 2
subklass_a = Class.new(subject)
subklass_b = Class.new(subject)
subklass_a.guests = 13
assert_equal 2, subklass_b.guests
assert_equal 13, subklass_a.guests
end
it "does not attempt to clone symbols" do
subject.glass = :highball
subklass = Class.new(subject)
subklass.glass.must_equal :highball
end
it "does not attempt to clone true" do
subject.glass = true
subklass = Class.new(subject)
subklass.glass.must_equal true
end
it "does not attempt to clone false" do
subject.glass = false
subklass = Class.new(subject)
subklass.glass.must_equal false
end
end
end
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