twitter-status-bot/.gems/gems/naught-1.0.0/spec/functions/maybe_spec.rb

36 lines
939 B
Ruby

require 'spec_helper'
describe 'Maybe()' do
include ConvertableNull::Conversions
specify 'given nil, returns a null object' do
expect(Maybe(nil).class).to be(ConvertableNull)
end
specify 'given a null object, returns the same null object' do
null = ConvertableNull.get
expect(Maybe(null)).to be(null)
end
specify 'given anything in null_equivalents, return a null object' do
expect(Maybe('').class).to be(ConvertableNull)
end
specify 'given anything else, returns the input unchanged' do
expect(Maybe(false)).to be(false)
str = 'hello'
expect(Maybe(str)).to be(str)
end
it 'generates null objects with useful trace info' do
null, line = Maybe(), __LINE__
expect(null.__file__).to eq(__FILE__)
expect(null.__line__).to eq(line)
end
it 'also works with blocks' do
expect(Maybe { nil }.class).to eq(ConvertableNull)
expect(Maybe { 'foo' }).to eq('foo')
end
end