Contents

require File.dirname(__FILE__) + '/../spec_helper'
include FastCache

describe Maybe, '.nothing' do

  it 'should return an object with nothing' do
    Maybe.nothing.should be_nothing
  end

end

describe Maybe, '.just' do

  it 'should return an object with the passed value' do
    Maybe.just(42).value.should == 42
  end

end

describe Maybe, '#anything?' do

  it 'should return true if there is a value' do
    Maybe.just(42).should be_anything
    Maybe.just(nil).should be_anything
  end

  it 'should return false if there is no value' do
    Maybe.nothing.should_not be_anything
  end

end

describe Maybe, '#nothing?' do

  it 'should return false if there is a value' do
    Maybe.just(42).should_not be_nothing
    Maybe.just(nil).should_not be_nothing
  end

  it 'should return true if there is no value' do
    Maybe.nothing.should be_nothing
  end

end

describe Maybe, 'getting and setting wrapped values' do

  it 'should allow setting a value on nothing' do
    [:hello, nil, false, true].each do |val|
      what = Maybe.nothing
      what.value = val
      what.should be_anything
    end
  end

  it 'should should replace existing values' do
    [:hello, nil, false, true].each do |val|
      what = Maybe.just(42)
      what.value = val
      what.value.should == val
    end
  end

end

describe Maybe, '#join' do

  it 'should keep nothing if nothing' do
    Maybe.nothing.join(Maybe.nothing).should be_nothing
    Maybe.nothing.join(Maybe.just(42)).should be_nothing
  end

  it 'should keep the new anything if anything' do
    what = Maybe.just(42).join(Maybe.just(43))
    what.should be_anything
    what.value.should == 43
  end

  it 'should become nothing if anything is passed nothing' do
    Maybe.just(42).join(Maybe.nothing).should be_nothing
  end

end

describe Maybe, '#void' do

  it 'should make an object with anything into one with nothing' do
    Maybe.just(42).void.should be_nothing
  end

  it 'should not let nothing remain nothing' do
    Maybe.nothing.void.should be_nothing
  end

end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
binary42-fastcache-0.1	spec/util/maybe_spec.rb
binary42-fastcache-0.2	spec/util/maybe_spec.rb
binary42-fastcache-0.3	spec/util/maybe_spec.rb