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Versions: 27
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Contents
require 'rspec'
require 'abstractivator/cons'
describe Abstractivator::Cons do
include Abstractivator::Cons
describe '#empty_list' do
it 'is a singleton' do
expect(empty_list).to eql empty_list
end
end
describe '#cons' do
it 'creates a cons cell' do
expect(cons(1, 2)).to eql [1,2 ]
end
end
describe '#head' do
it 'returns the head' do
cell = cons(1, 2)
expect(cell.head).to eql 1
end
end
describe '#tail' do
it 'returns the tail' do
cell = cons(1, 2)
expect(cell.tail).to eql 2
end
end
describe '#enum_to_list' do
it 'returns the list form of an enumerable' do
expect(enum_to_list([])).to eql empty_list
expect(enum_to_list([1,2,3])).to eql [1, [2, [3, empty_list]]]
end
end
describe '#list_to_enum' do
it 'returns the enumerable form of a list' do
expect(list_to_enum(empty_list).to_a).to eql []
expect(list_to_enum(cons(1, cons(2, cons(3, empty_list)))).to_a).to eql [1, 2, 3]
end
end
end
Version data entries
27 entries across 27 versions & 1 rubygems