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# frozen_string_literal: true
require 'fast_spec_helper'
RSpec.describe DeclarativeEnum do
let(:enum_module) do
Module.new do
extend DeclarativeEnum
key :my_enum
name 'MyEnumName'
description "Enum description"
define do
foo value: 0, description: 'description of foo'
bar value: 1, description: 'description of bar'
end
end
end
let(:original_definition) do
{
foo: { description: 'description of foo', value: 0 },
bar: { description: 'description of bar', value: 1 }
}
end
describe '.key' do
subject(:key) { enum_module.key(new_key) }
context 'when the argument is set' do
let(:new_key) { :new_enum_key }
it 'changes the key' do
expect { key }.to change { enum_module.key }.from(:my_enum).to(:new_enum_key)
end
end
context 'when the argument is `nil`' do
let(:new_key) { nil }
it { is_expected.to eq(:my_enum) }
end
end
describe '.name' do
subject(:name) { enum_module.name(new_name) }
context 'when the argument is set' do
let(:new_name) { 'NewMyEnumName' }
it 'changes the name' do
expect { name }.to change { enum_module.name }.from('MyEnumName').to('NewMyEnumName')
end
end
context 'when the argument is `nil`' do
let(:new_name) { nil }
it { is_expected.to eq('MyEnumName') }
end
end
describe '.description' do
subject(:description) { enum_module.description(new_description) }
context 'when the argument is set' do
let(:new_description) { 'New enum description' }
it 'changes the description' do
expect { description }.to change { enum_module.description }.from('Enum description').to('New enum description')
end
end
context 'when the argument is `nil`' do
let(:new_description) { nil }
it { is_expected.to eq('Enum description') }
end
end
describe '.define' do
subject(:define) { enum_module.define(&block) }
context 'when there is a block given' do
context 'when the given block tries to register the same key' do
let(:block) do
proc do
foo value: 2, description: 'description of foo'
end
end
it 'raises a `KeyCollisionError`' do
expect { define }.to raise_error(DeclarativeEnum::Builder::KeyCollisionError)
end
end
context 'when the given block does not try to register the same key' do
let(:expected_new_definition) { original_definition.merge(zoo: { description: 'description of zoo', value: 0 }) }
let(:block) do
proc do
zoo value: 0, description: 'description of zoo'
end
end
it 'appends the new definition' do
expect { define }.to change { enum_module.definition }.from(original_definition).to(expected_new_definition)
end
end
end
context 'when there is no block given' do
let(:block) { nil }
it 'raises a LocalJumpError' do
expect { define }.to raise_error(LocalJumpError)
end
end
end
describe '.definition' do
subject { enum_module.definition }
it { is_expected.to eq(original_definition) }
end
describe 'extending the enum module' do
let(:extended_definition) { original_definition.merge(zoo: { value: 2, description: 'description of zoo' }) }
let(:new_enum_module) do
Module.new do
extend DeclarativeEnum
define do
zoo value: 2, description: 'description of zoo'
end
end
end
subject(:prepend_new_enum_module) { enum_module.prepend(new_enum_module) }
it 'extends the values of the base enum module' do
expect { prepend_new_enum_module }.to change { enum_module.definition }.from(original_definition)
.to(extended_definition)
end
end
end
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