```ruby
# -*- encoding: us-ascii -*-

require_relative '../../../spec_helper'

describe "Enumerator::Lazy" do
  it "is a subclass of Enumerator" do
    Enumerator::Lazy.superclass.should equal(Enumerator)
  end

  it "defines lazy versions of a whitelist of Enumerator methods" do
    Enumerator::Lazy.instance_methods(false).should include(
      :chunk, :chunk_while, :collect, :collect_concat, :drop,
      :drop_while, :enum_for, :find_all, :flat_map, :force,
      :grep, :grep_v, :lazy, :map, :reject, :select, :slice_after,
      :slice_before, :slice_when, :take, :take_while, :to_enum,
      :uniq, :zip)
  end
end

describe "Enumerator::Lazy#lazy" do
  it "returns self" do
    lazy = (1..3).to_enum.lazy
    lazy.lazy.should equal(lazy)
  end
end
```

Fix spec on Ruby 2.3
user
```ruby
# -*- encoding: us-ascii -*-

require_relative '../../../spec_helper'

describe "Enumerator::Lazy" do
  it "is a subclass of Enumerator" do
    Enumerator::Lazy.superclass.should equal(Enumerator)
  end

  it "defines lazy versions of a whitelist of Enumerator methods" do
    lazy_methods = [
      :chunk, :collect, :collect_concat, :drop, :drop_while, :enum_for,
      :find_all, :flat_map, :force, :grep, :grep_v, :lazy, :map, :reject,
      :select, :slice_after, :slice_before, :slice_when, :take, :take_while,
      :to_enum, :zip
    ]
    ruby_version_is "2.4" do
      lazy_methods += [:chunk_while, :uniq]
    end

    Enumerator::Lazy.instance_methods(false).should include(*lazy_methods)
  end
end

describe "Enumerator::Lazy#lazy" do
  it "returns self" do
    lazy = (1..3).to_enum.lazy
    lazy.lazy.should equal(lazy)
  end
end
```
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