spec/ruby/core/struct/keyword_init_spec.rb


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require_relative '../../spec_helper'
require_relative 'fixtures/classes'

# See https://bugs.ruby-lang.org/issues/18008
describe "StructClass#keyword_init?" do
  it "returns true for a struct that accepts keyword arguments to initialize" do
    struct = Struct.new(:arg, keyword_init: true)
    struct.keyword_init?.should be_true
  end

  it "returns false for a struct that does not accept keyword arguments to initialize" do
    struct = Struct.new(:arg, keyword_init: false)
    struct.keyword_init?.should be_false
  end

  it "returns nil for a struct that did not explicitly specify keyword_init" do
    struct = Struct.new(:arg)
    struct.keyword_init?.should be_nil
  end

  it "returns nil for a struct that does specify keyword_init to be nil" do
    struct = Struct.new(:arg, keyword_init: nil)
    struct.keyword_init?.should be_nil
  end

  it "returns true for any truthy value, not just for true" do
    struct = Struct.new(:arg, keyword_init: 1)
    struct.keyword_init?.should be_true

    struct = Struct.new(:arg, keyword_init: "")
    struct.keyword_init?.should be_true

    struct = Struct.new(:arg, keyword_init: [])
    struct.keyword_init?.should be_true

    struct = Struct.new(:arg, keyword_init: {})
    struct.keyword_init?.should be_true
  end

  context "class inheriting Struct" do
    it "isn't available in a subclass" do
      StructClasses::StructSubclass.should_not.respond_to?(:keyword_init?)
    end
  end
end