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# frozen_string_literal: true
require "dry/core/constants"
RSpec.describe Dry::Core::Constants do
before do
class ClassWithConstants
include Dry::Core::Constants
def empty_array
EMPTY_ARRAY
end
def empty_hash
EMPTY_HASH
end
def empty_set
EMPTY_SET
end
def empty_string
EMPTY_STRING
end
def empty_opts
EMPTY_OPTS
end
def undefined
Undefined
end
end
end
after do
Object.send(:remove_const, :ClassWithConstants)
end
subject { ClassWithConstants.new }
it "makes constants available in your class" do
expect(subject.empty_array).to be Dry::Core::Constants::EMPTY_ARRAY
expect(subject.empty_array).to eql([])
expect(subject.empty_hash).to be Dry::Core::Constants::EMPTY_HASH
expect(subject.empty_hash).to eql({})
expect(subject.empty_set).to be Dry::Core::Constants::EMPTY_SET
expect(subject.empty_set).to eql(Set.new)
expect(subject.empty_string).to be Dry::Core::Constants::EMPTY_STRING
expect(subject.empty_string).to eql("")
expect(subject.empty_opts).to be Dry::Core::Constants::EMPTY_OPTS
expect(subject.empty_opts).to eql({})
expect(subject.undefined).to be Dry::Core::Constants::Undefined
end
describe "nested" do
before do
class ClassWithConstants
class Nested
def empty_array
EMPTY_ARRAY
end
end
end
end
subject { ClassWithConstants::Nested.new }
example "constants available in lexical scope" do
expect(subject.empty_array).to be Dry::Core::Constants::EMPTY_ARRAY
end
end
describe "Undefined" do
subject(:undefined) { Dry::Core::Constants::Undefined }
describe ".inspect" do
it 'returns "Undefined"' do
expect(subject.inspect).to eql("Undefined")
end
end
describe ".to_s" do
it 'returns "Undefined"' do
expect(subject.to_s).to eql("Undefined")
end
end
describe ".default" do
it "returns the first arg if it's not Undefined" do
expect(subject.default(:first, :second)).to eql(:first)
end
it "returns the second arg if the first one is Undefined" do
expect(subject.default(subject, :second)).to eql(:second)
end
it "yields a block" do
expect(subject.default(subject) { :second }).to eql(:second)
end
end
describe ".map" do
it "maps non-undefined value" do
expect(subject.map("foo", &:to_sym)).to be(:foo)
expect(subject.map(subject, &:to_sym)).to be(subject)
end
end
describe ".dup" do
subject { undefined.dup }
it { is_expected.to be(undefined) }
end
describe ".clone" do
subject { undefined.clone }
it { is_expected.to be(undefined) }
end
describe ".coalesce" do
it "returns first non-undefined value in a list" do
expect(undefined.coalesce(1, 2)).to be(1)
expect(undefined.coalesce(undefined, 1, 2)).to be(1)
expect(undefined.coalesce(undefined, undefined, 1, 2)).to be(1)
expect(undefined.coalesce(undefined, undefined)).to be(undefined)
expect(undefined.coalesce(nil)).to be(nil)
expect(undefined.coalesce(undefined, nil)).to be(nil)
expect(undefined.coalesce(undefined, nil, false)).to be(nil)
expect(undefined.coalesce(undefined, false, nil)).to be(false)
end
end
end
end
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