Resolve dependable_spec violation

Library/Homebrew/dependable.rb

@@ -11,6 +11,8 @@ module Dependable
   # misuse in future.
   RESERVED_TAGS = [:build, :optional, :recommended, :run, :test, :linked].freeze
 
+  attr_reader :tags
+
   def build?
     tags.include? :build
   end

Library/Homebrew/dependable.rbi

@@ -1,5 +0,0 @@
-# typed: strict
-
-module Dependable
-  def tags; end
-end

Library/Homebrew/dependency.rb

@@ -13,7 +13,7 @@ class Dependency
   include Dependable
   extend Cachable
 
-  attr_reader :name, :tags, :env_proc, :option_names
+  attr_reader :name, :env_proc, :option_names
 
   DEFAULT_ENV_PROC = proc {}.freeze
   private_constant :DEFAULT_ENV_PROC

Library/Homebrew/requirement.rb

@@ -17,7 +17,7 @@ class Requirement
   include Dependable
   extend Cachable
 
-  attr_reader :tags, :name, :cask, :download
+  attr_reader :name, :cask, :download
 
   def initialize(tags = [])
     # Only allow instances of subclasses. This base class enforces no constraints on its own.

Library/Homebrew/test/dependable_spec.rb

@@ -6,9 +6,14 @@ require "dependable"
 describe Dependable do
   alias_matcher :be_a_build_dependency, :be_build
 
-  subject(:dependable) { double(tags: tags).extend(described_class) }
-
-  let(:tags) { ["foo", "bar", :build] }
+  subject(:dependable) {
+    Class.new {
+      include Dependable
+      def initialize
+        @tags = ["foo", "bar", :build]
+      end
+    }.new
+  }
 
   specify "#options" do
     expect(dependable.options.as_flags.sort).to eq(%w[--foo --bar].sort)