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Contents
require 'spec_helper'
require 'usaidwat/either'
module USaidWat
describe Either do
it 'should return the initial value if all operations are successful' do
e = Right.new("value") >>
lambda { |res| Right.new(res.value.upcase) }
expect(e).to be_kind_of(Right)
expect(e.right?).to be true
expect(e.value).to eq('VALUE')
end
it 'should return an error value if an operation is not successful' do
e = Right.new("value") >>
lambda { |res| Right.new(res.value.count) rescue Left.new('No such method') }
expect(e).to be_kind_of(Left)
expect(e.left?).to be true
expect(e.value).to eq('No such method')
end
it 'should return an error value if any operation in the chain fails' do
e = Right.new("value") >>
lambda { |res| Right.new(res.value.upcase) } >>
lambda { |res| Right.new(res.value.count) rescue Left.new('No such method') } >>
lambda { |res| Right.new(res.value.capitalize) rescue Left.new('Chain failed') }
expect(e).to be_kind_of(Left)
expect(e.left?).to be true
expect(e.value).to eq('No such method')
end
it 'should say it is left if it is a Left value' do
e = Left.new('value')
expect(e.left?).to be true
end
it 'should say it is not right if it is a Left value' do
e = Left.new('value')
expect(e.right?).to be false
end
it 'should say it is not left if it is a Right value' do
e = Right.new('value')
expect(e.left?).to be false
end
it 'should say it is right if it is a Right value' do
e = Right.new('value')
expect(e.right?).to be true
end
end
end
Version data entries
12 entries across 12 versions & 1 rubygems