brew/Library/Homebrew/test/tap_spec.rb

# frozen_string_literal: true

RSpec.describe Tap do
  include FileUtils

  alias_matcher :have_formula_file, :be_formula_file
  alias_matcher :have_custom_remote, :be_custom_remote

  subject(:homebrew_foo_tap) { described_class.fetch("Homebrew", "foo") }

  let(:path) { HOMEBREW_TAP_DIRECTORY/"homebrew/homebrew-foo" }
  let(:formula_file) { path/"Formula/foo.rb" }
  let(:alias_file) { path/"Aliases/bar" }
  let(:cmd_file) { path/"cmd/brew-tap-cmd.rb" }
  let(:manpage_file) { path/"manpages/brew-tap-cmd.1" }
  let(:bash_completion_file) { path/"completions/bash/brew-tap-cmd" }
  let(:zsh_completion_file) { path/"completions/zsh/_brew-tap-cmd" }
  let(:fish_completion_file) { path/"completions/fish/brew-tap-cmd.fish" }

  before do
    path.mkpath
    (path/"audit_exceptions").mkpath
    (path/"style_exceptions").mkpath
  end

  def setup_tap_files
    formula_file.dirname.mkpath
    formula_file.write <<~RUBY
      class Foo < Formula
        url "https://brew.sh/foo-1.0.tar.gz"
      end
    RUBY

    alias_file.parent.mkpath
    ln_s formula_file, alias_file

    (path/"formula_renames.json").write <<~JSON
      { "oldname": "foo" }
    JSON

    (path/"tap_migrations.json").write <<~JSON
      { "removed-formula": "homebrew/foo" }
    JSON

    %w[audit_exceptions style_exceptions].each do |exceptions_directory|
      (path/exceptions_directory).mkpath

      (path/"#{exceptions_directory}/formula_list.json").write <<~JSON
        [ "foo", "bar" ]
      JSON

      (path/"#{exceptions_directory}/formula_hash.json").write <<~JSON
        { "foo": "foo1", "bar": "bar1" }
      JSON
    end

    (path/"pypi_formula_mappings.json").write <<~JSON
      {
        "formula1": "foo",
        "formula2": {
          "package_name": "foo",
          "extra_packages": ["bar"],
          "exclude_packages": ["baz"]
        }
      }
    JSON

    [
      cmd_file,
      manpage_file,
      bash_completion_file,
      zsh_completion_file,
      fish_completion_file,
    ].each do |f|
      f.parent.mkpath
      touch f
    end

    chmod 0755, cmd_file
  end

  def setup_git_repo
    path.cd do
      system "git", "init"
      system "git", "remote", "add", "origin", "https://github.com/Homebrew/homebrew-foo"
      system "git", "add", "--all"
      system "git", "commit", "-m", "init"
    end
  end

  def setup_completion(link:)
    HOMEBREW_REPOSITORY.cd do
      system "git", "init"
      system "git", "config", "--replace-all", "homebrew.linkcompletions", link.to_s
      system "git", "config", "--replace-all", "homebrew.completionsmessageshown", "true"
    end
  end

  specify "::fetch" do
    expect(described_class.fetch("Homebrew", "core")).to be_a(CoreTap)
    expect(described_class.fetch("Homebrew", "homebrew")).to be_a(CoreTap)
    tap = described_class.fetch("Homebrew", "foo")
    expect(tap).to be_a(described_class)
    expect(tap.name).to eq("homebrew/foo")

    expect do
      described_class.fetch("foo")
    end.to raise_error(Tap::InvalidNameError, /Invalid tap name/)

    expect do
      described_class.fetch("homebrew/homebrew/bar")
    end.to raise_error(Tap::InvalidNameError, /Invalid tap name/)

    expect do
      described_class.fetch("homebrew", "homebrew/baz")
    end.to raise_error(Tap::InvalidNameError, /Invalid tap name/)
  end

  describe "::from_path" do
    let(:tap) { described_class.fetch("Homebrew", "core") }
    let(:path) { tap.path }
    let(:formula_path) { path/"Formula/formula.rb" }

    it "returns the Tap for a Formula path" do
      expect(described_class.from_path(formula_path)).to eq tap
    end

    it "returns the Tap when given its exact path" do
      expect(described_class.from_path(path)).to eq tap
    end

    context "when path contains a dot" do
      let(:tap) { described_class.fetch("str4d.xyz", "rage") }

      after do
        tap.uninstall
      end

      it "returns the Tap when given its exact path" do
        expect(described_class.from_path(path)).to eq tap
      end
    end
  end

  describe "::allowed_taps" do
    before { allow(Homebrew::EnvConfig).to receive(:allowed_taps).and_return("homebrew/allowed") }

    it "returns a set of allowed taps according to the environment" do
      expect(described_class.allowed_taps)
        .to contain_exactly(described_class.fetch("homebrew/allowed"))
    end
  end

  describe "::forbidden_taps" do
    before { allow(Homebrew::EnvConfig).to receive(:forbidden_taps).and_return("homebrew/forbidden") }

    it "returns a set of forbidden taps according to the environment" do
      expect(described_class.forbidden_taps)
        .to contain_exactly(described_class.fetch("homebrew/forbidden"))
    end
  end

  specify "attributes" do
    expect(homebrew_foo_tap.user).to eq("Homebrew")
    expect(homebrew_foo_tap.repo).to eq("foo")
    expect(homebrew_foo_tap.name).to eq("homebrew/foo")
    expect(homebrew_foo_tap.path).to eq(path)
    expect(homebrew_foo_tap).to be_installed
    expect(homebrew_foo_tap).to be_official
    expect(homebrew_foo_tap).not_to be_a_core_tap
  end

  specify "#issues_url" do
    t = described_class.fetch("someone", "foo")
    path = HOMEBREW_TAP_DIRECTORY/"someone/homebrew-foo"
    path.mkpath
    cd path do
      system "git", "init"
      system "git", "remote", "add", "origin",
             "https://github.com/someone/homebrew-foo"
    end
    expect(t.issues_url).to eq("https://github.com/someone/homebrew-foo/issues")
    expect(homebrew_foo_tap.issues_url).to eq("https://github.com/Homebrew/homebrew-foo/issues")

    (HOMEBREW_TAP_DIRECTORY/"someone/homebrew-no-git").mkpath
    expect(described_class.fetch("someone", "no-git").issues_url).to be_nil
  ensure
    path.parent.rmtree
  end

  specify "files" do
    setup_tap_files

    expect(homebrew_foo_tap.formula_files).to eq([formula_file])
    expect(homebrew_foo_tap.formula_names).to eq(["homebrew/foo/foo"])
    expect(homebrew_foo_tap.alias_files).to eq([alias_file])
    expect(homebrew_foo_tap.aliases).to eq(["homebrew/foo/bar"])
    expect(homebrew_foo_tap.alias_table).to eq("homebrew/foo/bar" => "homebrew/foo/foo")
    expect(homebrew_foo_tap.alias_reverse_table).to eq("homebrew/foo/foo" => ["homebrew/foo/bar"])
    expect(homebrew_foo_tap.formula_renames).to eq("oldname" => "foo")
    expect(homebrew_foo_tap.tap_migrations).to eq("removed-formula" => "homebrew/foo")
    expect(homebrew_foo_tap.command_files).to eq([cmd_file])
    expect(homebrew_foo_tap.to_hash).to be_a(Hash)
    expect(homebrew_foo_tap).to have_formula_file(formula_file)
    expect(homebrew_foo_tap).to have_formula_file("Formula/foo.rb")
    expect(homebrew_foo_tap).not_to have_formula_file("bar.rb")
    expect(homebrew_foo_tap).not_to have_formula_file("Formula/baz.sh")
  end

  describe "#remote" do
    it "returns the remote URL", :needs_network do
      setup_git_repo

      expect(homebrew_foo_tap.remote).to eq("https://github.com/Homebrew/homebrew-foo")
      expect(homebrew_foo_tap).not_to have_custom_remote

      services_tap = described_class.fetch("Homebrew", "services")
      services_tap.path.mkpath
      services_tap.path.cd do
        system "git", "init"
        system "git", "remote", "add", "origin", "https://github.com/Homebrew/homebrew-services"
      end
      expect(services_tap).not_to be_private
    end

    it "returns nil if the Tap is not a Git repository" do
      expect(homebrew_foo_tap.remote).to be_nil
    end

    it "returns nil if Git is not available" do
      setup_git_repo
      allow(Utils::Git).to receive(:available?).and_return(false)
      expect(homebrew_foo_tap.remote).to be_nil
    end
  end

  describe "#remote_repo" do
    it "returns the remote https repository" do
      setup_git_repo

      expect(homebrew_foo_tap.remote_repo).to eq("Homebrew/homebrew-foo")

      services_tap = described_class.fetch("Homebrew", "services")
      services_tap.path.mkpath
      services_tap.path.cd do
        system "git", "init"
        system "git", "remote", "add", "origin", "https://github.com/Homebrew/homebrew-bar"
      end
      expect(services_tap.remote_repo).to eq("Homebrew/homebrew-bar")
    end

    it "returns the remote ssh repository" do
      setup_git_repo

      expect(homebrew_foo_tap.remote_repo).to eq("Homebrew/homebrew-foo")

      services_tap = described_class.fetch("Homebrew", "services")
      services_tap.path.mkpath
      services_tap.path.cd do
        system "git", "init"
        system "git", "remote", "add", "origin", "git@github.com:Homebrew/homebrew-bar"
      end
      expect(services_tap.remote_repo).to eq("Homebrew/homebrew-bar")
    end

    it "returns nil if the Tap is not a Git repository" do
      expect(homebrew_foo_tap.remote_repo).to be_nil
    end

    it "returns nil if Git is not available" do
      setup_git_repo
      allow(Utils::Git).to receive(:available?).and_return(false)
      expect(homebrew_foo_tap.remote_repo).to be_nil
    end
  end

  describe "#custom_remote?" do
    subject(:tap) { described_class.fetch("Homebrew", "services") }

    let(:remote) { nil }

    before do
      tap.path.mkpath
      system "git", "-C", tap.path, "init"
      system "git", "-C", tap.path, "remote", "add", "origin", remote if remote
    end

    context "if no remote is available" do
      it "returns true" do
        expect(tap.remote).to be_nil
        expect(tap.custom_remote?).to be true
      end
    end

    context "when using the default remote" do
      let(:remote) { "https://github.com/Homebrew/homebrew-services" }

      it(:custom_remote?) { expect(tap.custom_remote?).to be false }
    end

    context "when using a non-default remote" do
      let(:remote) { "git@github.com:Homebrew/homebrew-services" }

      it(:custom_remote?) { expect(tap.custom_remote?).to be true }
    end
  end

  specify "Git variant" do
    touch path/"README"
    setup_git_repo

    expect(homebrew_foo_tap.git_head).to eq("0453e16c8e3fac73104da50927a86221ca0740c2")
    expect(homebrew_foo_tap.git_last_commit).to match(/\A\d+ .+ ago\Z/)
  end

  specify "#private?", :needs_network do
    expect(homebrew_foo_tap).to be_private
  end

  describe "#install" do
    it "raises an error when the Tap is already tapped" do
      setup_git_repo
      already_tapped_tap = described_class.fetch("Homebrew", "foo")
      expect(already_tapped_tap).to be_installed
      expect { already_tapped_tap.install }.to raise_error(TapAlreadyTappedError)
    end

    it "raises an error when the Tap is already tapped with the right remote" do
      setup_git_repo
      already_tapped_tap = described_class.fetch("Homebrew", "foo")
      expect(already_tapped_tap).to be_installed
      right_remote = homebrew_foo_tap.remote
      expect { already_tapped_tap.install clone_target: right_remote }.to raise_error(TapAlreadyTappedError)
    end

    it "raises an error when the remote doesn't match" do
      setup_git_repo
      already_tapped_tap = described_class.fetch("Homebrew", "foo")
      expect(already_tapped_tap).to be_installed
      wrong_remote = "#{homebrew_foo_tap.remote}-oops"
      expect do
        already_tapped_tap.install clone_target: wrong_remote
      end.to raise_error(TapRemoteMismatchError)
    end

    it "raises an error when the remote for Homebrew/core doesn't match HOMEBREW_CORE_GIT_REMOTE" do
      core_tap = described_class.fetch("Homebrew", "core")
      wrong_remote = "#{Homebrew::EnvConfig.core_git_remote}-oops"
      expect do
        core_tap.install clone_target: wrong_remote
      end.to raise_error(TapCoreRemoteMismatchError)
    end

    it "raises an error when run `brew tap --custom-remote` without a custom remote (already installed)" do
      setup_git_repo
      already_tapped_tap = described_class.fetch("Homebrew", "foo")
      expect(already_tapped_tap).to be_installed

      expect do
        already_tapped_tap.install clone_target: nil, custom_remote: true
      end.to raise_error(TapNoCustomRemoteError)
    end

    it "raises an error when run `brew tap --custom-remote` without a custom remote (not installed)" do
      not_tapped_tap = described_class.fetch("Homebrew", "bar")
      expect(not_tapped_tap).not_to be_installed

      expect do
        not_tapped_tap.install clone_target: nil, custom_remote: true
      end.to raise_error(TapNoCustomRemoteError)
    end

    specify "Git error" do
      tap = described_class.fetch("user", "repo")

      expect do
        tap.install clone_target: "file:///not/existed/remote/url"
      end.to raise_error(ErrorDuringExecution)

      expect(tap).not_to be_installed
      expect(HOMEBREW_TAP_DIRECTORY/"user").not_to exist
    end
  end

  describe "#uninstall" do
    it "raises an error if the Tap is not available" do
      tap = described_class.fetch("Homebrew", "bar")
      expect { tap.uninstall }.to raise_error(TapUnavailableError)
    end
  end

  specify "#install and #uninstall" do
    setup_tap_files
    setup_git_repo
    setup_completion link: true

    tap = described_class.fetch("Homebrew", "bar")

    tap.install clone_target: homebrew_foo_tap.path/".git"

    expect(tap).to be_installed
    expect(HOMEBREW_PREFIX/"share/man/man1/brew-tap-cmd.1").to be_a_file
    expect(HOMEBREW_PREFIX/"etc/bash_completion.d/brew-tap-cmd").to be_a_file
    expect(HOMEBREW_PREFIX/"share/zsh/site-functions/_brew-tap-cmd").to be_a_file
    expect(HOMEBREW_PREFIX/"share/fish/vendor_completions.d/brew-tap-cmd.fish").to be_a_file
    tap.uninstall

    expect(tap).not_to be_installed
    expect(HOMEBREW_PREFIX/"share/man/man1/brew-tap-cmd.1").not_to exist
    expect(HOMEBREW_PREFIX/"share/man/man1").not_to exist
    expect(HOMEBREW_PREFIX/"etc/bash_completion.d/brew-tap-cmd").not_to exist
    expect(HOMEBREW_PREFIX/"share/zsh/site-functions/_brew-tap-cmd").not_to exist
    expect(HOMEBREW_PREFIX/"share/fish/vendor_completions.d/brew-tap-cmd.fish").not_to exist
  ensure
    (HOMEBREW_PREFIX/"etc").rmtree if (HOMEBREW_PREFIX/"etc").exist?
    (HOMEBREW_PREFIX/"share").rmtree if (HOMEBREW_PREFIX/"share").exist?
  end

  specify "#link_completions_and_manpages when completions are enabled for non-official tap" do
    setup_tap_files
    setup_git_repo
    setup_completion link: true
    tap = described_class.fetch("NotHomebrew", "baz")
    tap.install clone_target: homebrew_foo_tap.path/".git"
    (HOMEBREW_PREFIX/"share/man/man1/brew-tap-cmd.1").delete
    (HOMEBREW_PREFIX/"etc/bash_completion.d/brew-tap-cmd").delete
    (HOMEBREW_PREFIX/"share/zsh/site-functions/_brew-tap-cmd").delete
    (HOMEBREW_PREFIX/"share/fish/vendor_completions.d/brew-tap-cmd.fish").delete
    tap.link_completions_and_manpages
    expect(HOMEBREW_PREFIX/"share/man/man1/brew-tap-cmd.1").to be_a_file
    expect(HOMEBREW_PREFIX/"etc/bash_completion.d/brew-tap-cmd").to be_a_file
    expect(HOMEBREW_PREFIX/"share/zsh/site-functions/_brew-tap-cmd").to be_a_file
    expect(HOMEBREW_PREFIX/"share/fish/vendor_completions.d/brew-tap-cmd.fish").to be_a_file
    tap.uninstall
  ensure
    (HOMEBREW_PREFIX/"etc").rmtree if (HOMEBREW_PREFIX/"etc").exist?
    (HOMEBREW_PREFIX/"share").rmtree if (HOMEBREW_PREFIX/"share").exist?
  end

  specify "#link_completions_and_manpages when completions are disabled for non-official tap" do
    setup_tap_files
    setup_git_repo
    setup_completion link: false
    tap = described_class.fetch("NotHomebrew", "baz")
    tap.install clone_target: homebrew_foo_tap.path/".git"
    (HOMEBREW_PREFIX/"share/man/man1/brew-tap-cmd.1").delete
    tap.link_completions_and_manpages
    expect(HOMEBREW_PREFIX/"share/man/man1/brew-tap-cmd.1").to be_a_file
    expect(HOMEBREW_PREFIX/"etc/bash_completion.d/brew-tap-cmd").not_to be_a_file
    expect(HOMEBREW_PREFIX/"share/zsh/site-functions/_brew-tap-cmd").not_to be_a_file
    expect(HOMEBREW_PREFIX/"share/fish/vendor_completions.d/brew-tap-cmd.fish").not_to be_a_file
    tap.uninstall
  ensure
    (HOMEBREW_PREFIX/"etc").rmtree if (HOMEBREW_PREFIX/"etc").exist?
    (HOMEBREW_PREFIX/"share").rmtree if (HOMEBREW_PREFIX/"share").exist?
  end

  specify "#link_completions_and_manpages when completions are enabled for official tap" do
    setup_tap_files
    setup_git_repo
    setup_completion link: false
    tap = described_class.fetch("Homebrew", "baz")
    tap.install clone_target: homebrew_foo_tap.path/".git"
    (HOMEBREW_PREFIX/"share/man/man1/brew-tap-cmd.1").delete
    (HOMEBREW_PREFIX/"etc/bash_completion.d/brew-tap-cmd").delete
    (HOMEBREW_PREFIX/"share/zsh/site-functions/_brew-tap-cmd").delete
    (HOMEBREW_PREFIX/"share/fish/vendor_completions.d/brew-tap-cmd.fish").delete
    tap.link_completions_and_manpages
    expect(HOMEBREW_PREFIX/"share/man/man1/brew-tap-cmd.1").to be_a_file
    expect(HOMEBREW_PREFIX/"etc/bash_completion.d/brew-tap-cmd").to be_a_file
    expect(HOMEBREW_PREFIX/"share/zsh/site-functions/_brew-tap-cmd").to be_a_file
    expect(HOMEBREW_PREFIX/"share/fish/vendor_completions.d/brew-tap-cmd.fish").to be_a_file
    tap.uninstall
  ensure
    (HOMEBREW_PREFIX/"etc").rmtree if (HOMEBREW_PREFIX/"etc").exist?
    (HOMEBREW_PREFIX/"share").rmtree if (HOMEBREW_PREFIX/"share").exist?
  end

  specify "#config" do
    setup_git_repo

    expect(homebrew_foo_tap.config[:foo]).to be_nil
    homebrew_foo_tap.config[:foo] = true
    expect(homebrew_foo_tap.config[:foo]).to be true
    homebrew_foo_tap.config.delete(:foo)
    expect(homebrew_foo_tap.config[:foo]).to be_nil
  end

  describe ".each" do
    it "returns an enumerator if no block is passed" do
      expect(described_class.each).to be_an_instance_of(Enumerator)
    end

    context "when the core tap is not installed" do
      around do |example|
        FileUtils.rm_rf CoreTap.instance.path
        example.run
      ensure
        (CoreTap.instance.path/"Formula").mkpath
      end

      it "includes the core tap with the api" do
        ENV.delete("HOMEBREW_NO_INSTALL_FROM_API")
        expect(described_class.to_a).to include(CoreTap.instance)
      end

      it "omits the core tap without the api", :no_api do
        expect(described_class.to_a).not_to include(CoreTap.instance)
      end
    end
  end

  describe ".installed" do
    it "includes only installed taps" do
      expect(described_class.installed)
        .to contain_exactly(CoreTap.instance, described_class.fetch("homebrew/foo"))
    end
  end

  describe ".all" do
    it "includes the core and cask taps by default", :needs_macos do
      expect(described_class.all).to contain_exactly(
        CoreTap.instance,
        CoreCaskTap.instance,
        described_class.fetch("homebrew/foo"),
        described_class.fetch("third-party/tap"),
      )
    end

    it "includes the core tap and excludes the cask tap by default", :needs_linux do
      expect(described_class.all)
        .to contain_exactly(CoreTap.instance, described_class.fetch("homebrew/foo"))
    end
  end

  describe "Formula Lists" do
    describe "#formula_renames" do
      it "returns the formula_renames hash" do
        setup_tap_files

        expected_result = { "oldname" => "foo" }
        expect(homebrew_foo_tap.formula_renames).to eq expected_result
      end
    end

    describe "#tap_migrations" do
      it "returns the tap_migrations hash" do
        setup_tap_files

        expected_result = { "removed-formula" => "homebrew/foo" }
        expect(homebrew_foo_tap.tap_migrations).to eq expected_result
      end
    end

    describe "tap migration renames" do
      before do
        (path/"tap_migrations.json").write <<~JSON
          {
            "adobe-air-sdk": "homebrew/cask",
            "app-engine-go-32": "homebrew/cask/google-cloud-sdk",
            "app-engine-go-64": "homebrew/cask/google-cloud-sdk",
            "gimp": "homebrew/cask",
            "horndis": "homebrew/cask",
            "inkscape": "homebrew/cask",
            "schismtracker": "homebrew/cask/schism-tracker"
          }
        JSON
      end

      describe "#reverse_tap_migration_renames" do
        it "returns the expected hash" do
          expect(homebrew_foo_tap.reverse_tap_migrations_renames).to eq({
            "homebrew/cask/google-cloud-sdk" => %w[app-engine-go-32 app-engine-go-64],
            "homebrew/cask/schism-tracker"   => %w[schismtracker],
          })
        end
      end

      describe ".tap_migration_oldnames" do
        let(:cask_tap) { CoreCaskTap.instance }
        let(:core_tap) { CoreTap.instance }

        it "returns expected renames" do
          [
            [cask_tap, "gimp", []],
            [core_tap, "schism-tracker", []],
            [cask_tap, "schism-tracker", %w[schismtracker]],
            [cask_tap, "google-cloud-sdk", %w[app-engine-go-32 app-engine-go-64]],
          ].each do |tap, name, result|
            expect(described_class.tap_migration_oldnames(tap, name)).to eq(result)
          end
        end
      end
    end

    describe "#audit_exceptions" do
      it "returns the audit_exceptions hash" do
        setup_tap_files

        expected_result = {
          formula_list: ["foo", "bar"],
          formula_hash: { "foo" => "foo1", "bar" => "bar1" },
        }
        expect(homebrew_foo_tap.audit_exceptions).to eq expected_result
      end
    end

    describe "#style_exceptions" do
      it "returns the style_exceptions hash" do
        setup_tap_files

        expected_result = {
          formula_list: ["foo", "bar"],
          formula_hash: { "foo" => "foo1", "bar" => "bar1" },
        }
        expect(homebrew_foo_tap.style_exceptions).to eq expected_result
      end
    end

    describe "#pypi_formula_mappings" do
      it "returns the pypi_formula_mappings hash" do
        setup_tap_files

        expected_result = {
          "formula1" => "foo",
          "formula2" => {
            "package_name"     => "foo",
            "extra_packages"   => ["bar"],
            "exclude_packages" => ["baz"],
          },
        }
        expect(homebrew_foo_tap.pypi_formula_mappings).to eq expected_result
      end
    end
  end

  describe CoreTap do
    subject(:core_tap) { described_class.instance }

    specify "attributes" do
      expect(core_tap.user).to eq("Homebrew")
      expect(core_tap.repo).to eq("core")
      expect(core_tap.name).to eq("homebrew/core")
      expect(core_tap.command_files).to eq([])
      expect(core_tap).to be_installed
      expect(core_tap).to be_official
      expect(core_tap).to be_a_core_tap
    end

    specify "forbidden operations" do
      expect { core_tap.uninstall }.to raise_error(RuntimeError)
    end

    specify "files" do
      path = HOMEBREW_TAP_DIRECTORY/"homebrew/homebrew-core"
      formula_file = core_tap.formula_dir/"foo.rb"
      core_tap.formula_dir.mkpath
      formula_file.write <<~RUBY
        class Foo < Formula
          url "https://brew.sh/foo-1.0.tar.gz"
        end
      RUBY

      formula_list_file_json = '{ "foo": "foo1", "bar": "bar1" }'
      formula_list_file_contents = { "foo" => "foo1", "bar" => "bar1" }
      %w[
        formula_renames.json
        tap_migrations.json
        audit_exceptions/formula_list.json
        style_exceptions/formula_hash.json
        pypi_formula_mappings.json
      ].each do |file|
        (path/file).dirname.mkpath
        (path/file).write formula_list_file_json
      end

      alias_file = core_tap.alias_dir/"bar"
      alias_file.parent.mkpath
      ln_s formula_file, alias_file

      expect(core_tap.formula_files).to eq([formula_file])
      expect(core_tap.formula_names).to eq(["foo"])
      expect(core_tap.alias_files).to eq([alias_file])
      expect(core_tap.aliases).to eq(["bar"])
      expect(core_tap.alias_table).to eq("bar" => "foo")
      expect(core_tap.alias_reverse_table).to eq("foo" => ["bar"])

      expect(core_tap.formula_renames).to eq formula_list_file_contents
      expect(core_tap.tap_migrations).to eq formula_list_file_contents
      expect(core_tap.audit_exceptions).to eq({ formula_list: formula_list_file_contents })
      expect(core_tap.style_exceptions).to eq({ formula_hash: formula_list_file_contents })
      expect(core_tap.pypi_formula_mappings).to eq formula_list_file_contents
    end
  end

  describe "#repo_var_suffix" do
    it "converts the repo directory to an environment variable suffix" do
      expect(CoreTap.instance.repo_var_suffix).to eq "_HOMEBREW_HOMEBREW_CORE"
    end

    it "converts non-alphanumeric characters to underscores" do
      expect(described_class.fetch("my", "tap-with-dashes").repo_var_suffix).to eq "_MY_HOMEBREW_TAP_WITH_DASHES"
      expect(described_class.fetch("my", "tap-with-@-symbol").repo_var_suffix).to eq "_MY_HOMEBREW_TAP_WITH___SYMBOL"
    end
  end

  describe "::with_formula_name" do
    it "returns the tap and formula name when given a full name" do
      expect(described_class.with_formula_name("homebrew/core/gcc")).to eq [CoreTap.instance, "gcc"]
    end

    it "returns nil when given a relative path" do
      expect(described_class.with_formula_name("./Formula/gcc.rb")).to be_nil
    end
  end

  describe "::with_cask_token" do
    it "returns the tap and cask token when given a full token" do
      expect(described_class.with_cask_token("homebrew/cask/alfred")).to eq [CoreCaskTap.instance, "alfred"]
    end

    it "returns nil when given a relative path" do
      expect(described_class.with_cask_token("./Casks/alfred.rb")).to be_nil
    end
  end
end