Merge pull request #3659 from MikeMcQuaid/deprecated-requirements-harder

Deprecate requirements harder

14 files changed, 134 insertions, 457 deletions

diff --git a/Library/Homebrew/compat/dependency_collector.rb b/Library/Homebrew/compat/dependency_collector.rb
index 652cf370b..1c91f2283 100644
--- a/Library/Homebrew/compat/dependency_collector.rb
+++ b/Library/Homebrew/compat/dependency_collector.rb
@@ -27,57 +27,42 @@ class DependencyCollector
       odeprecated "'depends_on :tex'"
       TeXRequirement.new(tags)
     when :autoconf, :automake, :bsdmake, :libtool
-      output_deprecation(spec, tags)
+      output_deprecation(spec)
       autotools_dep(spec, tags)
     when :cairo, :fontconfig, :freetype, :libpng, :pixman
-      output_deprecation(spec, tags)
+      output_deprecation(spec)
       Dependency.new(spec.to_s, tags)
     when :ant, :expat
-      # output_deprecation(spec, tags)
+      output_deprecation(spec)
       Dependency.new(spec.to_s, tags)
     when :libltdl
       tags << :run
-      output_deprecation("libtool", tags)
+      output_deprecation("libtool")
       Dependency.new("libtool", tags)
     when :apr
-      output_deprecation(spec, tags, "apr-util")
+      output_deprecation(spec, "apr-util")
       Dependency.new("apr-util", tags)
     when :fortran
-      # output_deprecation(spec, tags, "gcc")
-      FortranRequirement.new(tags)
+      output_deprecation(spec, "gcc")
+      Dependency.new("gcc", tags)
     when :gpg
-      # output_deprecation(spec, tags, "gnupg")
-      GPG2Requirement.new(tags)
+      output_deprecation(spec, "gnupg")
+      Dependency.new("gnupg", tags)
     when :hg
-      # output_deprecation(spec, tags, "mercurial")
-      MercurialRequirement.new(tags)
+      output_deprecation(spec, "mercurial")
+      Dependency.new("mercurial", tags)
     when :mpi
-      # output_deprecation(spec, tags, "open-mpi")
-      MPIRequirement.new(*tags)
-    when :emacs
-      # output_deprecation(spec, tags)
-      EmacsRequirement.new(tags)
-    when :mysql
-      # output_deprecation(spec, tags)
-      MysqlRequirement.new(tags)
-    when :perl
-      # output_deprecation(spec, tags)
-      PerlRequirement.new(tags)
-    when :postgresql
-      # output_deprecation(spec, tags)
-      PostgresqlRequirement.new(tags)
+      output_deprecation(spec, "open-mpi")
+      Dependency.new("open-mpi", tags)
     when :python, :python2
-      # output_deprecation(spec, tags)
-      PythonRequirement.new(tags)
+      output_deprecation(spec, "python")
+      Dependency.new("python", tags)
     when :python3
-      # output_deprecation(spec, tags)
-      Python3Requirement.new(tags)
-    when :rbenv
-      # output_deprecation(spec, tags)
-      RbenvRequirement.new(tags)
-    when :ruby
-      # output_deprecation(spec, tags)
-      RubyRequirement.new(tags)
+      output_deprecation(spec, "python3")
+      Dependency.new("python3", tags)
+    when :emacs, :mysql, :perl, :postgresql, :rbenv, :ruby
+      output_deprecation(spec)
+      Dependency.new(spec, tags)
     else
       _parse_symbol_spec(spec, tags)
     end
@@ -88,13 +73,8 @@ class DependencyCollector
     Dependency.new(spec.to_s, tags)
   end
 
-  def output_deprecation(dependency, tags, new_dependency = dependency)
-    tags_string = if tags.length > 1
-      " => [:#{tags.join ", :"}]"
-    elsif tags.length == 1
-      " => :#{tags.first}"
-    end
+  def output_deprecation(dependency, new_dependency = dependency)
     odeprecated "'depends_on :#{dependency}'",
-                "'depends_on \"#{new_dependency}\"#{tags_string}'"
+                "'depends_on \"#{new_dependency}\"'"
   end
 end
diff --git a/Library/Homebrew/compat/requirements.rb b/Library/Homebrew/compat/requirements.rb
index 304dd2504..bffc5f5f1 100644
--- a/Library/Homebrew/compat/requirements.rb
+++ b/Library/Homebrew/compat/requirements.rb
@@ -1,76 +1,134 @@
 require "requirements"
-require "compat/requirements/emacs_requirement"
-require "compat/requirements/fortran_requirement"
 require "compat/requirements/language_module_requirement"
-require "compat/requirements/mpi_requirement"
-require "compat/requirements/perl_requirement"
-require "compat/requirements/python_requirement"
-require "compat/requirements/ruby_requirement"
-require "compat/requirements/tex_requirement"
 
-class MysqlRequirement < Requirement
+class CVSRequirement < Requirement
   fatal true
-  default_formula "mysql"
-  satisfy { which "mysql_config" }
+  satisfy do
+    odeprecated("CVSRequirement", "'depends_on \"cvs\"'")
+    which "cvs"
+  end
 end
 
-class PostgresqlRequirement < Requirement
+class EmacsRequirement < Requirement
   fatal true
-  default_formula "postgresql"
-  satisfy { which "pg_config" }
+  satisfy do
+    odeprecated("EmacsRequirement", "'depends_on \"cvs\"'")
+    which "emacs"
+  end
 end
 
-class RbenvRequirement < Requirement
+class FortranRequirement < Requirement
   fatal true
-  default_formula "rbenv"
-  satisfy { which "rbenv" }
+  satisfy do
+    odeprecated("FortranRequirement", "'depends_on \"cvs\"'")
+    which "gfortran"
+  end
 end
 
-class CVSRequirement < Requirement
+class GitRequirement < Requirement
+  fatal true
+  satisfy do
+    odeprecated("GitRequirement", "'depends_on \"cvs\"'")
+    which "git"
+  end
+end
+
+class GPG2Requirement < Requirement
   fatal true
-  default_formula "cvs"
-  satisfy { which "cvs" }
+  satisfy do
+    odeprecated("GPG2Requirement", "'depends_on \"cvs\"'")
+    which "gpg"
+  end
 end
 
 class MercurialRequirement < Requirement
   fatal true
-  default_formula "mercurial"
-  satisfy { which "hg" }
+  satisfy do
+    odeprecated("MercurialRequirement", "'depends_on \"cvs\"'")
+    which "hg"
+  end
 end
 
-class GPG2Requirement < Requirement
+class MPIRequirement < Requirement
   fatal true
-  default_formula "gnupg"
-  satisfy { which "gpg" }
+  satisfy do
+    odeprecated("MPIRequirement", "'depends_on \"cvs\"'")
+    which "mpicc"
+  end
 end
 
-class GitRequirement < Requirement
+class MysqlRequirement < Requirement
+  fatal true
+  satisfy do
+    odeprecated("MysqlRequirement", "'depends_on \"cvs\"'")
+    which "mysql_config"
+  end
+end
+
+class PerlRequirement < Requirement
+  fatal true
+  satisfy do
+    odeprecated("PerlRequirement", "'depends_on \"cvs\"'")
+    which "perl"
+  end
+end
+
+class PostgresqlRequirement < Requirement
+  fatal true
+  satisfy do
+    odeprecated("PostgresqlRequirement", "'depends_on \"cvs\"'")
+    which "pg_config"
+  end
+end
+
+class PythonRequirement < Requirement
+  fatal true
+  satisfy do
+    odeprecated("PythonRequirement", "'depends_on \"cvs\"'")
+    which "python"
+  end
+end
+
+class Python3Requirement < Requirement
   fatal true
-  default_formula "git"
-  satisfy { Utils.git_available? }
+  satisfy do
+    odeprecated("Python3Requirement", "'depends_on \"cvs\"'")
+    which "python3"
+  end
+end
+
+class RbenvRequirement < Requirement
+  fatal true
+  satisfy do
+    odeprecated("RbenvRequirement", "'depends_on \"cvs\"'")
+    which "rbenv"
+  end
+end
+
+class RubyRequirement < Requirement
+  fatal true
+  satisfy do
+    odeprecated("RubyRequirement", "'depends_on \"cvs\"'")
+    which "ruby"
+  end
 end
 
 class SubversionRequirement < Requirement
   fatal true
-  default_formula "subversion"
-  satisfy { Utils.svn_available? }
-end
-
-XcodeDependency            = XcodeRequirement
-MysqlDependency            = MysqlRequirement
-PostgresqlDependency       = PostgresqlRequirement
-GPGDependency              = GPG2Requirement
-GPGRequirement             = GPG2Requirement
-TeXDependency              = TeXRequirement
-MercurialDependency        = MercurialRequirement
-GitDependency              = GitRequirement
-FortranDependency          = FortranRequirement
-JavaDependency             = JavaRequirement
-LanguageModuleDependency   = LanguageModuleRequirement
-MPIDependency              = MPIRequirement
-OsxfuseDependency          = OsxfuseRequirement
-PythonDependency           = PythonRequirement
-TuntapDependency           = TuntapRequirement
-X11Dependency              = X11Requirement
-ConflictsWithBinaryOsxfuse = NonBinaryOsxfuseRequirement
-MinimumMacOSRequirement    = MacOSRequirement
+  satisfy do
+    odeprecated("SubversionRequirement", "'depends_on \"cvs\"'")
+    which "svn"
+  end
+end
+
+class TeXRequirement < Requirement
+  fatal true
+  cask "mactex"
+  download "https://www.tug.org/mactex/"
+  satisfy do
+    odeprecated("TeXRequirement", "'depends_on \"cvs\"'")
+    which("tex") || which("latex")
+  end
+end
+
+MinimumMacOSRequirement = MacOSRequirement
diff --git a/Library/Homebrew/compat/requirements/emacs_requirement.rb b/Library/Homebrew/compat/requirements/emacs_requirement.rb
deleted file mode 100644
index c8e2ec274..000000000
--- a/Library/Homebrew/compat/requirements/emacs_requirement.rb
+++ /dev/null
@@ -1,35 +0,0 @@
-class EmacsRequirement < Requirement
-  fatal true
-  default_formula "emacs"
-
-  def initialize(tags)
-    @version = tags.shift if /\d+\.*\d*/ =~ tags.first
-    super
-  end
-
-  satisfy build_env: false do
-    next false unless which "emacs"
-    next true unless @version
-    emacs_version = Utils.popen_read("emacs", "--batch", "--eval", "(princ emacs-version)")
-    Version.create(emacs_version) >= Version.create(@version)
-  end
-
-  env do
-    ENV.prepend_path "PATH", which("emacs").dirname
-    ENV["EMACS"] = "emacs"
-  end
-
-  def message
-    if @version
-      s = "Emacs #{@version} or later is required."
-    else
-      s = "Emacs is required."
-    end
-    s += super
-    s
-  end
-
-  def inspect
-    "#<#{self.class.name}: #{name.inspect} #{tags.inspect} version=#{@version.inspect}>"
-  end
-end
diff --git a/Library/Homebrew/compat/requirements/fortran_requirement.rb b/Library/Homebrew/compat/requirements/fortran_requirement.rb
deleted file mode 100644
index ba3fead6f..000000000
--- a/Library/Homebrew/compat/requirements/fortran_requirement.rb
+++ /dev/null
@@ -1,13 +0,0 @@
-require "requirement"
-
-class FortranRequirement < Requirement
-  fatal true
-
-  default_formula "gcc"
-
-  env { ENV.fortran }
-
-  satisfy build_env: false do
-    which(ENV["FC"] || "gfortran")
-  end
-end
diff --git a/Library/Homebrew/compat/requirements/mpi_requirement.rb b/Library/Homebrew/compat/requirements/mpi_requirement.rb
deleted file mode 100644
index 065b56c8b..000000000
--- a/Library/Homebrew/compat/requirements/mpi_requirement.rb
+++ /dev/null
@@ -1,66 +0,0 @@
-require "requirement"
-
-# There are multiple implementations of MPI-2 available.
-# http://www.mpi-forum.org/
-# This requirement is used to find an appropriate one.
-class MPIRequirement < Requirement
-  attr_reader :lang_list
-
-  fatal true
-
-  default_formula "open-mpi"
-
-  env :userpaths
-
-  # This method must accept varargs rather than an array for
-  # backwards compatibility with formulae that call it directly.
-  def initialize(*tags)
-    @non_functional = []
-    @unknown_langs = []
-    @lang_list = [:cc, :cxx, :f77, :f90] & tags
-    tags -= @lang_list
-    super(tags)
-  end
-
-  def mpi_wrapper_works?(compiler)
-    compiler = which compiler
-    return false if compiler.nil? || !compiler.executable?
-
-    # Some wrappers are non-functional and will return a non-zero exit code
-    # when invoked for version info.
-    #
-    # NOTE: A better test may be to do a small test compilation a la autotools.
-    quiet_system compiler, "--version"
-  end
-
-  def inspect
-    "#<#{self.class.name}: #{name.inspect} #{tags.inspect} lang_list=#{@lang_list.inspect}>"
-  end
-
-  satisfy do
-    @lang_list.each do |lang|
-      case lang
-      when :cc, :cxx, :f90, :f77
-        compiler = "mpi" + lang.to_s
-        @non_functional << compiler unless mpi_wrapper_works? compiler
-      else
-        @unknown_langs << lang.to_s
-      end
-    end
-    @unknown_langs.empty? && @non_functional.empty?
-  end
-
-  env do
-    # Set environment variables to help configure scripts find MPI compilers.
-    # Variable names taken from:
-    # https://www.gnu.org/software/autoconf-archive/ax_mpi.html
-    @lang_list.each do |lang|
-      compiler = "mpi" + lang.to_s
-      mpi_path = which compiler
-
-      # Fortran 90 environment var has a different name
-      compiler = "MPIFC" if lang == :f90
-      ENV[compiler.upcase] = mpi_path
-    end
-  end
-end
diff --git a/Library/Homebrew/compat/requirements/perl_requirement.rb b/Library/Homebrew/compat/requirements/perl_requirement.rb
deleted file mode 100644
index 70eb2a36c..000000000
--- a/Library/Homebrew/compat/requirements/perl_requirement.rb
+++ /dev/null
@@ -1,36 +0,0 @@
-class PerlRequirement < Requirement
-  fatal true
-  default_formula "perl"
-
-  def initialize(tags)
-    @version = tags.shift if /^\d+\.\d+$/ =~ tags.first
-    raise "PerlRequirement requires a version!" unless @version
-    super
-  end
-
-  satisfy(build_env: false) do
-    which_all("perl").detect do |perl|
-      perl_version = Utils.popen_read(perl, "--version")[/v(\d+\.\d+)(?:\.\d+)?/, 1]
-      next unless perl_version
-      Version.create(perl_version.to_s) >= Version.create(@version)
-    end
-  end
-
-  def message
-    s = "Perl #{@version} is required to install this formula."
-    s += super
-    s
-  end
-
-  def inspect
-    "#<#{self.class.name}: #{name.inspect} #{tags.inspect} version=#{@version.inspect}>"
-  end
-
-  def display_s
-    if @version
-      "#{name} >= #{@version}"
-    else
-      name
-    end
-  end
-end
diff --git a/Library/Homebrew/compat/requirements/python_requirement.rb b/Library/Homebrew/compat/requirements/python_requirement.rb
deleted file mode 100644
index 3215d0a6c..000000000
--- a/Library/Homebrew/compat/requirements/python_requirement.rb
+++ /dev/null
@@ -1,68 +0,0 @@
-require "language/python"
-
-class PythonRequirement < Requirement
-  fatal true
-  default_formula "python"
-
-  satisfy build_env: false do
-    python = which_python
-    next unless python
-    next unless short_version
-    # Always use Python 2.7 for consistency on older versions of Mac OS X.
-    short_version == Version.create("2.7")
-  end
-
-  env do
-    if !system_python? && short_version == Version.create("2.7")
-      ENV.prepend_path "PATH", which_python.dirname
-    end
-
-    # Homebrew Python should take precedence over other Pythons in the PATH
-    ENV.prepend_path "PATH", Formula["python"].opt_bin
-    ENV.prepend_path "PATH", Formula["python"].opt_libexec/"bin"
-
-    if system_python?
-      ENV["PYTHONPATH"] = "#{HOMEBREW_PREFIX}/lib/python#{short_version}/site-packages"
-    end
-  end
-
-  private
-
-  def short_version
-    @short_version ||= Language::Python.major_minor_version which_python
-  end
-
-  def which_python
-    python = which python_binary
-    return unless python
-    Pathname.new Utils.popen_read(python, "-c", "import sys; print(sys.executable)").strip
-  end
-
-  def system_python
-    "/usr/bin/#{python_binary}"
-  end
-
-  def system_python?
-    system_python == which_python.to_s
-  end
-
-  def python_binary
-    "python2.7"
-  end
-
-  # Deprecated
-  alias to_s python_binary
-end
-
-class Python3Requirement < PythonRequirement
-  fatal true
-  default_formula "python3"
-
-  satisfy(build_env: false) { which_python }
-
-  private
-
-  def python_binary
-    "python3"
-  end
-end
diff --git a/Library/Homebrew/compat/requirements/ruby_requirement.rb b/Library/Homebrew/compat/requirements/ruby_requirement.rb
deleted file mode 100644
index a9ec8c42d..000000000
--- a/Library/Homebrew/compat/requirements/ruby_requirement.rb
+++ /dev/null
@@ -1,56 +0,0 @@
-class RubyRequirement < Requirement
-  fatal true
-  default_formula "ruby"
-
-  def initialize(tags)
-    @version = tags.shift if /(\d\.)+\d/ =~ tags.first
-    raise "RubyRequirement requires a version!" unless @version
-    super
-  end
-
-  satisfy(build_env: false) { new_enough_ruby }
-
-  env do
-    ENV.prepend_path "PATH", new_enough_ruby.dirname
-  end
-
-  def message
-    s = "Ruby >= #{@version} is required to install this formula."
-    s += super
-    s
-  end
-
-  def inspect
-    "#<#{self.class.name}: #{name.inspect} #{tags.inspect} version=#{@version.inspect}>"
-  end
-
-  def display_s
-    if @version
-      "#{name} >= #{@version}"
-    else
-      name
-    end
-  end
-
-  private
-
-  def new_enough_ruby
-    rubies.detect { |ruby| new_enough?(ruby) }
-  end
-
-  def rubies
-    rubies = which_all("ruby")
-    ruby_formula = Formula["ruby"]
-    rubies.unshift ruby_formula.bin/"ruby" if ruby_formula&.installed?
-    rubies.uniq
-  end
-
-  def new_enough?(ruby)
-    version = Utils.popen_read(ruby, "-e", "print RUBY_VERSION").strip
-    version =~ /^\d+\.\d+/ && Version.create(version) >= min_version
-  end
-
-  def min_version
-    @min_version ||= Version.create(@version)
-  end
-end
diff --git a/Library/Homebrew/compat/requirements/tex_requirement.rb b/Library/Homebrew/compat/requirements/tex_requirement.rb
deleted file mode 100644
index cb26a8477..000000000
--- a/Library/Homebrew/compat/requirements/tex_requirement.rb
+++ /dev/null
@@ -1,20 +0,0 @@
-require "requirement"
-
-class TeXRequirement < Requirement
-  fatal true
-  cask "mactex"
-  download "https://www.tug.org/mactex/"
-
-  satisfy { which("tex") || which("latex") }
-
-  def message
-    s = <<~EOS
-      A LaTeX distribution is required for Homebrew to install this formula.
-
-      Make sure that "/usr/texbin", or the location you installed it to, is in
-      your PATH before proceeding.
-    EOS
-    s += super
-    s
-  end
-end
diff --git a/Library/Homebrew/extend/os/linux/requirements/java_requirement.rb b/Library/Homebrew/extend/os/linux/requirements/java_requirement.rb
index 7816f6b6f..23a68743d 100644
--- a/Library/Homebrew/extend/os/linux/requirements/java_requirement.rb
+++ b/Library/Homebrew/extend/os/linux/requirements/java_requirement.rb
@@ -1,8 +1,6 @@
 require "language/java"
 
 class JavaRequirement < Requirement
-  default_formula "jdk"
-
   env do
     env_java_common
     env_oracle_jdk
diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index 7b1d94eb2..2b7460408 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -14,6 +14,7 @@ require "tap"
 require "keg"
 require "migrator"
 require "extend/ENV"
+require "language/python"
 
 # A formula provides instructions and metadata for Homebrew to install a piece
 # of software. Every Homebrew formula is a {Formula}.
diff --git a/Library/Homebrew/test/dependency_collector_spec.rb b/Library/Homebrew/test/dependency_collector_spec.rb
index 216bbf316..0f182a69e 100644
--- a/Library/Homebrew/test/dependency_collector_spec.rb
+++ b/Library/Homebrew/test/dependency_collector_spec.rb
@@ -66,11 +66,6 @@ describe DependencyCollector do
       expect(dep).to be_optional
     end
 
-    specify "ant dependency", :needs_compat do
-      subject.add ant: :build
-      expect(find_dependency("ant")).to eq(Dependency.new("ant", [:build]))
-    end
-
     it "doesn't mutate the dependency spec" do
       spec = { "foo" => :optional }
       copy = spec.dup
diff --git a/Library/Homebrew/test/formula_installer_spec.rb b/Library/Homebrew/test/formula_installer_spec.rb
index d3710a4cb..93f23b18f 100644
--- a/Library/Homebrew/test/formula_installer_spec.rb
+++ b/Library/Homebrew/test/formula_installer_spec.rb
@@ -132,64 +132,4 @@ describe FormulaInstaller do
       fi.check_install_sanity
     }.to raise_error(CannotInstallFormulaError)
   end
-
-  describe "#install_requirement_formula?", :needs_compat do
-    before do
-      @requirement = Python3Requirement.new
-      @requirement_dependency = @requirement.to_dependency
-      @install_bottle_for_dependent = false
-      allow(@requirement).to receive(:satisfied?).and_return(satisfied?)
-      allow(@requirement).to receive(:satisfied_by_formula?).and_return(satisfied_by_formula?)
-      allow(@requirement).to receive(:build?).and_return(build?)
-      @dependent = formula do
-        url "foo"
-        version "0.1"
-        depends_on :python3
-      end
-      allow(@dependent).to receive(:installed?).and_return(installed?)
-      @fi = FormulaInstaller.new(@dependent)
-    end
-
-    subject { @fi.install_requirement_formula?(@requirement_dependency, @requirement, @dependent, @install_bottle_for_dependent) }
-
-    context "it returns false when requirement is satisfied" do
-      let(:satisfied?) { true }
-      let(:satisfied_by_formula?) { false }
-      let(:build?) { false }
-      let(:installed?) { false }
-      it { is_expected.to be false }
-    end
-
-    context "it returns false when requirement is satisfied but default formula is installed" do
-      let(:satisfied?) { true }
-      let(:satisfied_by_formula?) { false }
-      let(:build?) { false }
-      let(:installed?) { false }
-      it { is_expected.to be false }
-    end
-
-    context "it returns false when requirement is :build and dependent is installed" do
-      let(:satisfied?) { false }
-      let(:satisfied_by_formula?) { false }
-      let(:build?) { true }
-      let(:installed?) { true }
-      it { is_expected.to be false }
-    end
-
-    context "it returns true when requirement isn't satisfied" do
-      let(:satisfied?) { false }
-      let(:satisfied_by_formula?) { false }
-      let(:build?) { false }
-      let(:installed?) { false }
-      it { is_expected.to be true }
-    end
-
-    context "it returns true when requirement is satisfied by a formula" do
-      let(:satisfied?) { true }
-      let(:satisfied_by_formula?) { true }
-      let(:build?) { false }
-      let(:installed?) { false }
-      it { is_expected.to be true }
-    end
-  end
 end
diff --git a/Library/Homebrew/test/mpi_requirement_spec.rb b/Library/Homebrew/test/mpi_requirement_spec.rb
index 87f99eb3a..aecdb1b66 100644
--- a/Library/Homebrew/test/mpi_requirement_spec.rb
+++ b/Library/Homebrew/test/mpi_requirement_spec.rb
@@ -1,14 +1,13 @@
-require "compat/requirements/mpi_requirement"
+require "compat/requirements"
 
 describe MPIRequirement, :needs_compat do
   describe "::new" do
-    subject { described_class.new(*(wrappers + tags)) }
+    subject { described_class.new(wrappers + tags) }
     let(:wrappers) { [:cc, :cxx, :f77] }
     let(:tags) { [:optional, "some-other-tag"] }
 
-    it "untangles wrappers and tags" do
-      expect(subject.lang_list).to eq(wrappers)
-      expect(subject.tags).to eq(tags)
+    it "stores wrappers as tags" do
+      expect(subject.tags).to eq(wrappers + tags)
     end
   end
 end