Directly save artifacts in DSL.

23 files changed, 106 insertions, 58 deletions

diff --git a/Library/Homebrew/cask/lib/hbc/artifact.rb b/Library/Homebrew/cask/lib/hbc/artifact.rb
index cb15ec051..505f9ec13 100644
--- a/Library/Homebrew/cask/lib/hbc/artifact.rb
+++ b/Library/Homebrew/cask/lib/hbc/artifact.rb
@@ -59,10 +59,5 @@ module Hbc
       PostflightBlock,
       Zap,
     ].freeze
-
-    def self.for_cask(cask)
-      odebug "Determining which artifacts are present in Cask #{cask}"
-      CLASSES.flat_map { |klass| klass.for_cask(cask) }
-    end
   end
 end
diff --git a/Library/Homebrew/cask/lib/hbc/artifact/abstract_artifact.rb b/Library/Homebrew/cask/lib/hbc/artifact/abstract_artifact.rb
index fa8fc2996..331e098e0 100644
--- a/Library/Homebrew/cask/lib/hbc/artifact/abstract_artifact.rb
+++ b/Library/Homebrew/cask/lib/hbc/artifact/abstract_artifact.rb
@@ -1,6 +1,7 @@
 module Hbc
   module Artifact
     class AbstractArtifact
+      include Comparable
       extend Predicable
 
       def self.english_name
@@ -19,8 +20,35 @@ module Hbc
         @dirmethod ||= "#{dsl_key}dir".to_sym
       end
 
-      def self.for_cask(cask)
-        cask.artifacts[self].to_a
+      def <=>(other)
+        @@sort_order ||= [ # rubocop:disable Style/ClassVars
+          PreflightBlock,
+          Uninstall,
+          NestedContainer,
+          Installer,
+          App,
+          Suite,
+          Artifact,        # generic 'artifact' stanza
+          Colorpicker,
+          Pkg,
+          Prefpane,
+          Qlplugin,
+          Dictionary,
+          Font,
+          Service,
+          StageOnly,
+          Binary,
+          InputMethod,
+          InternetPlugin,
+          AudioUnitPlugin,
+          VstPlugin,
+          Vst3Plugin,
+          ScreenSaver,
+          PostflightBlock,
+          Zap,
+        ]
+
+        (@@sort_order.index(self.class) <=> @@sort_order.index(other.class)).to_i
       end
 
       # TODO: this sort of logic would make more sense in dsl.rb, or a
diff --git a/Library/Homebrew/cask/lib/hbc/audit.rb b/Library/Homebrew/cask/lib/hbc/audit.rb
index 2d8e4e4d7..5b5a7b63d 100644
--- a/Library/Homebrew/cask/lib/hbc/audit.rb
+++ b/Library/Homebrew/cask/lib/hbc/audit.rb
@@ -218,7 +218,7 @@ module Hbc
     end
 
     def check_generic_artifacts
-      cask.artifacts[Hbc::Artifact::Artifact].each do |artifact|
+      cask.artifacts.select { |a| a.is_a?(Hbc::Artifact::Artifact) }.each do |artifact|
         unless artifact.target.absolute?
           add_error "target must be absolute path for #{artifact.class.english_name} #{artifact.source}"
         end
diff --git a/Library/Homebrew/cask/lib/hbc/cli/info.rb b/Library/Homebrew/cask/lib/hbc/cli/info.rb
index 2b4db9530..f12fe5564 100644
--- a/Library/Homebrew/cask/lib/hbc/cli/info.rb
+++ b/Library/Homebrew/cask/lib/hbc/cli/info.rb
@@ -77,11 +77,11 @@ module Hbc
 
       def self.artifact_info(cask)
         ohai "Artifacts"
-        DSL::ORDINARY_ARTIFACT_CLASSES.flat_map { |klass| klass.for_cask(cask) }
-                                      .select { |artifact| artifact.respond_to?(:install_phase) }
-                                      .each do |artifact|
-                                        puts artifact.to_s
-                                      end
+        cask.artifacts.each do |artifact|
+          next unless artifact.respond_to?(:install_phase)
+          next unless DSL::ORDINARY_ARTIFACT_CLASSES.include?(artifact.class)
+          puts artifact.to_s
+        end
       end
     end
   end
diff --git a/Library/Homebrew/cask/lib/hbc/cli/list.rb b/Library/Homebrew/cask/lib/hbc/cli/list.rb
index 32415af8a..4b6a25d01 100644
--- a/Library/Homebrew/cask/lib/hbc/cli/list.rb
+++ b/Library/Homebrew/cask/lib/hbc/cli/list.rb
@@ -30,7 +30,7 @@ module Hbc
       end
 
       def self.list_artifacts(cask)
-        Artifact.for_cask(cask).group_by(&:class).each do |klass, artifacts|
+        cask.artifacts.group_by(&:class).each do |klass, artifacts|
           next unless klass.respond_to?(:english_description)
           ohai klass.english_description, artifacts.map(&:summarize_installed)
         end
diff --git a/Library/Homebrew/cask/lib/hbc/container/base.rb b/Library/Homebrew/cask/lib/hbc/container/base.rb
index 4363168e7..78610a1ab 100644
--- a/Library/Homebrew/cask/lib/hbc/container/base.rb
+++ b/Library/Homebrew/cask/lib/hbc/container/base.rb
@@ -20,7 +20,7 @@ module Hbc
 
         unless children.count == 1 &&
                !nested_container.directory? &&
-               Artifact::NestedContainer.for_cask(@cask).none? &&
+               @cask.artifacts.none? { |a| a.is_a?(Artifact::NestedContainer) } &&
                extract_nested_container(nested_container)
 
           children.each do |src|
diff --git a/Library/Homebrew/cask/lib/hbc/dsl.rb b/Library/Homebrew/cask/lib/hbc/dsl.rb
index 75c1ca873..2db2c66a9 100644
--- a/Library/Homebrew/cask/lib/hbc/dsl.rb
+++ b/Library/Homebrew/cask/lib/hbc/dsl.rb
@@ -176,7 +176,7 @@ module Hbc
           DSL::Container.new(*args).tap do |container|
             # TODO: remove this backward-compatibility section after removing nested_container
             if container&.nested
-              artifacts[Artifact::NestedContainer] << Artifact::NestedContainer.new(cask, container.nested)
+              artifacts.add(Artifact::NestedContainer.new(cask, container.nested))
             end
           end
         end
@@ -219,7 +219,7 @@ module Hbc
     end
 
     def artifacts
-      @artifacts ||= Hash.new { |hash, key| hash[key] = Set.new }
+      @artifacts ||= SortedSet.new
     end
 
     def caskroom_path
@@ -253,11 +253,11 @@ module Hbc
     ORDINARY_ARTIFACT_CLASSES.each do |klass|
       define_method(klass.dsl_key) do |*args|
         begin
-          if [*artifacts.keys, klass].include?(Artifact::StageOnly) && (artifacts.keys & ACTIVATABLE_ARTIFACT_CLASSES).any?
+          if [*artifacts.map(&:class), klass].include?(Artifact::StageOnly) && (artifacts.map(&:class) & ACTIVATABLE_ARTIFACT_CLASSES).any?
             raise CaskInvalidError.new(cask, "'stage_only' must be the only activatable artifact.")
           end
 
-          artifacts[klass].add(klass.from_args(cask, *args))
+          artifacts.add(klass.from_args(cask, *args))
         rescue CaskInvalidError
           raise
         rescue StandardError => e
@@ -269,7 +269,7 @@ module Hbc
     ARTIFACT_BLOCK_CLASSES.each do |klass|
       [klass.dsl_key, klass.uninstall_dsl_key].each do |dsl_key|
         define_method(dsl_key) do |&block|
-          artifacts[klass] << klass.new(cask, dsl_key => block)
+          artifacts.add(klass.new(cask, dsl_key => block))
         end
       end
     end
diff --git a/Library/Homebrew/cask/lib/hbc/installer.rb b/Library/Homebrew/cask/lib/hbc/installer.rb
index 01aae935d..ffbbac181 100644
--- a/Library/Homebrew/cask/lib/hbc/installer.rb
+++ b/Library/Homebrew/cask/lib/hbc/installer.rb
@@ -177,7 +177,7 @@ module Hbc
       already_installed_artifacts = []
 
       odebug "Installing artifacts"
-      artifacts = Artifact.for_cask(@cask)
+      artifacts = @cask.artifacts
       odebug "#{artifacts.length} artifact/s defined", artifacts
 
       artifacts.each do |artifact|
@@ -374,7 +374,7 @@ module Hbc
 
     def uninstall_artifacts
       odebug "Un-installing artifacts"
-      artifacts = Artifact.for_cask(@cask)
+      artifacts = @cask.artifacts
 
       odebug "#{artifacts.length} artifact/s defined", artifacts
 
@@ -388,7 +388,7 @@ module Hbc
     def zap
       ohai %Q(Implied "brew cask uninstall #{@cask}")
       uninstall_artifacts
-      if (zap_stanzas = Artifact::Zap.for_cask(@cask)).empty?
+      if (zap_stanzas = @cask.artifacts.select { |a| a.is_a?(Artifact::Zap) }).empty?
         opoo "No zap stanza present for Cask '#{@cask}'"
       else
         ohai "Dispatching zap stanza"
diff --git a/Library/Homebrew/cask/lib/hbc/staged.rb b/Library/Homebrew/cask/lib/hbc/staged.rb
index 6fd3f6709..da097e0cf 100644
--- a/Library/Homebrew/cask/lib/hbc/staged.rb
+++ b/Library/Homebrew/cask/lib/hbc/staged.rb
@@ -4,7 +4,7 @@ module Hbc
       index =  0 if index == :first
       index =  1 if index == :second
       index = -1 if index == :last
-      @cask.artifacts[Artifact::App].to_a.at(index).target.join("Contents", "Info.plist")
+      @cask.artifacts.select { |a| a.is_a?(Artifact::App) }.at(index).target.join("Contents", "Info.plist")
     end
 
     def plist_exec(cmd)
diff --git a/Library/Homebrew/test/cask/artifact/alt_target_spec.rb b/Library/Homebrew/test/cask/artifact/alt_target_spec.rb
index 02be796ed..fa5d7e650 100644
--- a/Library/Homebrew/test/cask/artifact/alt_target_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/alt_target_spec.rb
@@ -3,7 +3,7 @@ describe Hbc::Artifact::App, :cask do
     let(:cask) { Hbc::CaskLoader.load_from_file(TEST_FIXTURE_DIR/"cask/Casks/with-alt-target.rb") }
 
     let(:install_phase) {
-      -> { described_class.for_cask(cask).each { |artifact| artifact.install_phase(command: Hbc::NeverSudoSystemCommand, force: false) } }
+      -> { cask.artifacts.select { |a| a.is_a?(described_class) }.each { |artifact| artifact.install_phase(command: Hbc::NeverSudoSystemCommand, force: false) } }
     }
 
     let(:source_path) { cask.staged_path.join("Caffeine.app") }
diff --git a/Library/Homebrew/test/cask/artifact/app_spec.rb b/Library/Homebrew/test/cask/artifact/app_spec.rb
index f67ffd31b..5ecaaef22 100644
--- a/Library/Homebrew/test/cask/artifact/app_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/app_spec.rb
@@ -2,7 +2,7 @@ describe Hbc::Artifact::App, :cask do
   let(:cask) { Hbc::CaskLoader.load_from_file(TEST_FIXTURE_DIR/"cask/Casks/local-caffeine.rb") }
   let(:command) { Hbc::SystemCommand }
   let(:force) { false }
-  let(:app) { described_class.for_cask(cask).first }
+  let(:app) { cask.artifacts.select { |a| a.is_a?(described_class) }.first }
 
   let(:source_path) { cask.staged_path.join("Caffeine.app") }
   let(:target_path) { Hbc.appdir.join("Caffeine.app") }
diff --git a/Library/Homebrew/test/cask/artifact/binary_spec.rb b/Library/Homebrew/test/cask/artifact/binary_spec.rb
index 5ffaca861..08b0af198 100644
--- a/Library/Homebrew/test/cask/artifact/binary_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/binary_spec.rb
@@ -26,7 +26,7 @@ describe Hbc::Artifact::Binary, :cask do
   end
 
   it "links the binary to the proper directory" do
-    described_class.for_cask(cask)
+    cask.artifacts.select { |a| a.is_a?(described_class) }
       .each { |artifact| artifact.install_phase(command: Hbc::NeverSudoSystemCommand, force: false) }
 
     expect(expected_path).to be_a_symlink
@@ -46,7 +46,7 @@ describe Hbc::Artifact::Binary, :cask do
       expect(FileUtils).to receive(:chmod)
         .with("+x", cask.staged_path.join("naked_non_executable")).and_call_original
 
-      described_class.for_cask(cask)
+      cask.artifacts.select { |a| a.is_a?(described_class) }
       .each { |artifact| artifact.install_phase(command: Hbc::NeverSudoSystemCommand, force: false) }
 
       expect(expected_path).to be_a_symlink
@@ -58,7 +58,7 @@ describe Hbc::Artifact::Binary, :cask do
     FileUtils.touch expected_path
 
     expect {
-      described_class.for_cask(cask)
+      cask.artifacts.select { |a| a.is_a?(described_class) }
         .each { |artifact| artifact.install_phase(command: Hbc::NeverSudoSystemCommand, force: false) }
     }.to raise_error(Hbc::CaskError)
 
@@ -68,7 +68,7 @@ describe Hbc::Artifact::Binary, :cask do
   it "clobbers an existing symlink" do
     expected_path.make_symlink("/tmp")
 
-    described_class.for_cask(cask)
+    cask.artifacts.select { |a| a.is_a?(described_class) }
       .each { |artifact| artifact.install_phase(command: Hbc::NeverSudoSystemCommand, force: false) }
 
     expect(File.readlink(expected_path)).not_to eq("/tmp")
@@ -77,7 +77,7 @@ describe Hbc::Artifact::Binary, :cask do
   it "creates parent directory if it doesn't exist" do
     FileUtils.rmdir Hbc.binarydir
 
-    described_class.for_cask(cask)
+    cask.artifacts.select { |a| a.is_a?(described_class) }
       .each { |artifact| artifact.install_phase(command: Hbc::NeverSudoSystemCommand, force: false) }
 
     expect(expected_path.exist?).to be true
@@ -91,9 +91,9 @@ describe Hbc::Artifact::Binary, :cask do
     }
 
     it "links the binary to the proper directory" do
-      Hbc::Artifact::App.for_cask(cask)
+      cask.artifacts.select { |a| a.is_a?(Hbc::Artifact::App) }
         .each { |artifact| artifact.install_phase(command: Hbc::NeverSudoSystemCommand, force: false) }
-      described_class.for_cask(cask)
+      cask.artifacts.select { |a| a.is_a?(described_class) }
         .each { |artifact| artifact.install_phase(command: Hbc::NeverSudoSystemCommand, force: false) }
 
       expect(expected_path).to be_a_symlink
diff --git a/Library/Homebrew/test/cask/artifact/generic_artifact_spec.rb b/Library/Homebrew/test/cask/artifact/generic_artifact_spec.rb
index bec8c2742..8dc30439d 100644
--- a/Library/Homebrew/test/cask/artifact/generic_artifact_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/generic_artifact_spec.rb
@@ -2,7 +2,7 @@ describe Hbc::Artifact::Artifact, :cask do
   let(:cask) { Hbc::CaskLoader.load_from_file(TEST_FIXTURE_DIR/"cask/Casks/with-generic-artifact.rb") }
 
   let(:install_phase) {
-    -> { described_class.for_cask(cask).each { |artifact| artifact.install_phase(command: Hbc::NeverSudoSystemCommand, force: false) } }
+    -> { cask.artifacts.select { |a| a.is_a?(described_class) }.each { |artifact| artifact.install_phase(command: Hbc::NeverSudoSystemCommand, force: false) } }
   }
 
   let(:source_path) { cask.staged_path.join("Caffeine.app") }
diff --git a/Library/Homebrew/test/cask/artifact/nested_container_spec.rb b/Library/Homebrew/test/cask/artifact/nested_container_spec.rb
index 41d143764..65759b5b7 100644
--- a/Library/Homebrew/test/cask/artifact/nested_container_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/nested_container_spec.rb
@@ -5,7 +5,7 @@ describe Hbc::Artifact::NestedContainer, :cask do
         InstallHelper.install_without_artifacts(c)
       end
 
-      described_class.for_cask(cask)
+      cask.artifacts.select { |a| a.is_a?(described_class) }
         .each { |artifact| artifact.install_phase(command: Hbc::NeverSudoSystemCommand, force: false) }
 
       expect(cask.staged_path.join("MyNestedApp.app")).to be_a_directory
diff --git a/Library/Homebrew/test/cask/artifact/pkg_spec.rb b/Library/Homebrew/test/cask/artifact/pkg_spec.rb
index c6a45c49a..d3028be9c 100644
--- a/Library/Homebrew/test/cask/artifact/pkg_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/pkg_spec.rb
@@ -8,7 +8,7 @@ describe Hbc::Artifact::Pkg, :cask do
 
   describe "install_phase" do
     it "runs the system installer on the specified pkgs" do
-      pkg = described_class.for_cask(cask).first
+      pkg = cask.artifacts.select { |a| a.is_a?(described_class) }.first
 
       expect(fake_system_command).to receive(:run!).with(
         "/usr/sbin/installer",
@@ -25,7 +25,7 @@ describe Hbc::Artifact::Pkg, :cask do
     let(:cask) { Hbc::CaskLoader.load_from_file(TEST_FIXTURE_DIR/"cask/Casks/with-choices.rb") }
 
     it "passes the choice changes xml to the system installer" do
-      pkg = described_class.for_cask(cask).first
+      pkg = cask.artifacts.select { |a| a.is_a?(described_class) }.first
 
       file = double(path: Pathname.new("/tmp/choices.xml"))
 
diff --git a/Library/Homebrew/test/cask/artifact/postflight_block_spec.rb b/Library/Homebrew/test/cask/artifact/postflight_block_spec.rb
index 4a44bb59b..acd63671a 100644
--- a/Library/Homebrew/test/cask/artifact/postflight_block_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/postflight_block_spec.rb
@@ -11,7 +11,7 @@ describe Hbc::Artifact::PostflightBlock, :cask do
         end
       end
 
-      described_class.for_cask(cask)
+      cask.artifacts.select { |a| a.is_a?(described_class) }
         .each { |artifact| artifact.install_phase(command: Hbc::NeverSudoSystemCommand, force: false) }
 
       expect(called).to be true
@@ -31,7 +31,7 @@ describe Hbc::Artifact::PostflightBlock, :cask do
         end
       end
 
-      described_class.for_cask(cask)
+      cask.artifacts.select { |a| a.is_a?(described_class) }
         .each { |artifact| artifact.uninstall_phase(command: Hbc::NeverSudoSystemCommand, force: false) }
 
       expect(called).to be true
diff --git a/Library/Homebrew/test/cask/artifact/preflight_block_spec.rb b/Library/Homebrew/test/cask/artifact/preflight_block_spec.rb
index d7d4e72d9..285a93ffb 100644
--- a/Library/Homebrew/test/cask/artifact/preflight_block_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/preflight_block_spec.rb
@@ -11,7 +11,7 @@ describe Hbc::Artifact::PreflightBlock, :cask do
         end
       end
 
-      described_class.for_cask(cask)
+      cask.artifacts.select { |a| a.is_a?(described_class) }
         .each { |artifact| artifact.install_phase(command: Hbc::NeverSudoSystemCommand, force: false) }
 
       expect(called).to be true
@@ -31,7 +31,7 @@ describe Hbc::Artifact::PreflightBlock, :cask do
         end
       end
 
-      described_class.for_cask(cask)
+      cask.artifacts.select { |a| a.is_a?(described_class) }
         .each { |artifact| artifact.uninstall_phase(command: Hbc::NeverSudoSystemCommand, force: false) }
 
       expect(called).to be true
diff --git a/Library/Homebrew/test/cask/artifact/suite_spec.rb b/Library/Homebrew/test/cask/artifact/suite_spec.rb
index 2f913fecc..1826dffbb 100644
--- a/Library/Homebrew/test/cask/artifact/suite_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/suite_spec.rb
@@ -2,7 +2,7 @@ describe Hbc::Artifact::Suite, :cask do
   let(:cask) { Hbc::CaskLoader.load_from_file(TEST_FIXTURE_DIR/"cask/Casks/with-suite.rb") }
 
   let(:install_phase) {
-    -> { described_class.for_cask(cask).each { |artifact| artifact.install_phase(command: Hbc::NeverSudoSystemCommand, force: false) } }
+    -> { cask.artifacts.select { |a| a.is_a?(described_class) }.each { |artifact| artifact.install_phase(command: Hbc::NeverSudoSystemCommand, force: false) } }
   }
 
   let(:target_path) { Hbc.appdir.join("Caffeine") }
diff --git a/Library/Homebrew/test/cask/artifact/two_apps_correct_spec.rb b/Library/Homebrew/test/cask/artifact/two_apps_correct_spec.rb
index f6e0d3c97..ca8c44903 100644
--- a/Library/Homebrew/test/cask/artifact/two_apps_correct_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/two_apps_correct_spec.rb
@@ -3,7 +3,7 @@ describe Hbc::Artifact::App, :cask do
     let(:cask) { Hbc::CaskLoader.load_from_file(TEST_FIXTURE_DIR/"cask/Casks/with-two-apps-correct.rb") }
 
     let(:install_phase) {
-      -> { described_class.for_cask(cask).each { |artifact| artifact.install_phase(command: Hbc::NeverSudoSystemCommand, force: false) } }
+      -> { cask.artifacts.select { |a| a.is_a?(described_class) }.each { |artifact| artifact.install_phase(command: Hbc::NeverSudoSystemCommand, force: false) } }
     }
 
     let(:source_path_mini) { cask.staged_path.join("Caffeine Mini.app") }
diff --git a/Library/Homebrew/test/cask/artifact/uninstall_no_zap_spec.rb b/Library/Homebrew/test/cask/artifact/uninstall_no_zap_spec.rb
index d6a8393da..da0bfbb78 100644
--- a/Library/Homebrew/test/cask/artifact/uninstall_no_zap_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/uninstall_no_zap_spec.rb
@@ -2,7 +2,7 @@ describe Hbc::Artifact::Zap, :cask do
   let(:cask) { Hbc::CaskLoader.load_from_file(TEST_FIXTURE_DIR/"cask/Casks/with-installable.rb") }
 
   let(:zap_artifact) {
-    described_class.for_cask(cask).first
+    cask.artifacts.select { |a| a.is_a?(described_class) }.first
   }
 
   before(:each) do
diff --git a/Library/Homebrew/test/cask/artifact/uninstall_zap_shared_examples.rb b/Library/Homebrew/test/cask/artifact/uninstall_zap_shared_examples.rb
index 4fdab60d0..f1eb1b913 100644
--- a/Library/Homebrew/test/cask/artifact/uninstall_zap_shared_examples.rb
+++ b/Library/Homebrew/test/cask/artifact/uninstall_zap_shared_examples.rb
@@ -1,6 +1,6 @@
 shared_examples "#uninstall_phase or #zap_phase" do
   let(:artifact_dsl_key) { described_class.dsl_key }
-  let(:artifact) { described_class.for_cask(cask).first }
+  let(:artifact) { cask.artifacts.select { |a| a.is_a?(described_class) }.first }
   let(:fake_system_command) { Hbc::FakeSystemCommand }
 
   subject { artifact.public_send(:"#{artifact_dsl_key}_phase", command: fake_system_command) }
diff --git a/Library/Homebrew/test/cask/cli/list_spec.rb b/Library/Homebrew/test/cask/cli/list_spec.rb
index 75da82762..4f59aafe9 100644
--- a/Library/Homebrew/test/cask/cli/list_spec.rb
+++ b/Library/Homebrew/test/cask/cli/list_spec.rb
@@ -72,7 +72,7 @@ describe Hbc::CLI::List, :cask do
     it "lists the installed files for those Casks" do
       casks.each(&InstallHelper.method(:install_without_artifacts_with_caskfile))
 
-      Hbc::Artifact::App.for_cask(transmission)
+      transmission.artifacts.select { |a| a.is_a?(Hbc::Artifact::App) }
         .each { |artifact| artifact.install_phase(command: Hbc::NeverSudoSystemCommand, force: false) }
 
       expect {
diff --git a/Library/Homebrew/test/cask/dsl_spec.rb b/Library/Homebrew/test/cask/dsl_spec.rb
index e03af9aef..390e56b18 100644
--- a/Library/Homebrew/test/cask/dsl_spec.rb
+++ b/Library/Homebrew/test/cask/dsl_spec.rb
@@ -216,12 +216,12 @@ describe Hbc::DSL, :cask do
         app "Bar.app"
       end
 
-      expect(cask.artifacts[Hbc::Artifact::App].map(&:to_s)).to eq(["Foo.app (App)", "Bar.app (App)"])
+      expect(cask.artifacts.select { |a| a.is_a?(Hbc::Artifact::App) }.map(&:to_s)).to eq(["Foo.app (App)", "Bar.app (App)"])
     end
 
     it "allow app stanzas to be empty" do
       cask = Hbc::Cask.new("cask-with-no-apps")
-      expect(cask.artifacts[Hbc::Artifact::App]).to be_empty
+      expect(cask.artifacts.select { |a| a.is_a?(Hbc::Artifact::App) }).to be_empty
     end
   end
 
@@ -249,7 +249,7 @@ describe Hbc::DSL, :cask do
         pkg "Bar.pkg"
       end
 
-      expect(cask.artifacts[Hbc::Artifact::Pkg].map(&:to_s)).to eq(["Foo.pkg (Pkg)", "Bar.pkg (Pkg)"])
+      expect(cask.artifacts.select { |a| a.is_a?(Hbc::Artifact::Pkg) }.map(&:to_s)).to eq(["Foo.pkg (Pkg)", "Bar.pkg (Pkg)"])
     end
   end
 
@@ -501,10 +501,10 @@ describe Hbc::DSL, :cask do
       let(:token) { "with-installer-script" }
 
       it "allows installer script to be specified" do
-        expect(cask.artifacts[Hbc::Artifact::Installer].first.path).to eq(Pathname("/usr/bin/true"))
-        expect(cask.artifacts[Hbc::Artifact::Installer].first.args[:args]).to eq(["--flag"])
-        expect(cask.artifacts[Hbc::Artifact::Installer].to_a[1].path).to eq(Pathname("/usr/bin/false"))
-        expect(cask.artifacts[Hbc::Artifact::Installer].to_a[1].args[:args]).to eq(["--flag"])
+        expect(cask.artifacts.select { |a| a.is_a?(Hbc::Artifact::Installer) }.first.path).to eq(Pathname("/usr/bin/true"))
+        expect(cask.artifacts.select { |a| a.is_a?(Hbc::Artifact::Installer) }.first.args[:args]).to eq(["--flag"])
+        expect(cask.artifacts.select { |a| a.is_a?(Hbc::Artifact::Installer) }.to_a[1].path).to eq(Pathname("/usr/bin/false"))
+        expect(cask.artifacts.select { |a| a.is_a?(Hbc::Artifact::Installer) }.to_a[1].args[:args]).to eq(["--flag"])
       end
     end
 
@@ -512,7 +512,7 @@ describe Hbc::DSL, :cask do
       let(:token) { "with-installer-manual" }
 
       it "allows installer manual to be specified" do
-        installer = cask.artifacts[Hbc::Artifact::Installer].first
+        installer = cask.artifacts.select { |a| a.is_a?(Hbc::Artifact::Installer) }.first
         expect(installer).to be_a(Hbc::Artifact::Installer::ManualInstaller)
         expect(installer.path).to eq(cask.staged_path.join("Caffeine.app"))
       end
@@ -524,7 +524,7 @@ describe Hbc::DSL, :cask do
       let(:token) { "stage-only" }
 
       it "allows stage_only stanza to be specified" do
-        expect(cask.artifacts[Hbc::Artifact::StageOnly]).not_to be_empty
+        expect(cask.artifacts.select { |a| a.is_a?(Hbc::Artifact::StageOnly) }).not_to be_empty
       end
     end
 
@@ -545,12 +545,12 @@ describe Hbc::DSL, :cask do
     end
   end
 
-  describe "appdir" do
+  describe "#appdir" do
     context "interpolation of the appdir in stanzas" do
       let(:token) { "appdir-interpolation" }
 
       it "is allowed" do
-        expect(cask.artifacts[Hbc::Artifact::Binary].first.source).to eq(Hbc.appdir/"some/path")
+        expect(cask.artifacts.select { |a| a.is_a?(Hbc::Artifact::Binary) }.first.source).to eq(Hbc.appdir/"some/path")
       end
     end
 
@@ -563,10 +563,35 @@ describe Hbc::DSL, :cask do
           binary "#{appdir}/some/path"
         end
 
-        expect(cask.artifacts[Hbc::Artifact::Binary].first.source).to eq(original_appdir/"some/path")
+        expect(cask.artifacts.select { |a| a.is_a?(Hbc::Artifact::Binary) }.first.source).to eq(original_appdir/"some/path")
       ensure
         Hbc.appdir = original_appdir
       end
     end
   end
+
+  describe "#artifacts" do
+    it "sorts artifacts according to the preferable installation order" do
+      cask = Hbc::Cask.new("appdir-trailing-slash") do
+        postflight do
+          next
+        end
+
+        preflight do
+          next
+        end
+
+        binary "binary"
+
+        app "App.app"
+      end
+
+      expect(cask.artifacts.map(&:class).map(&:dsl_key)).to eq [
+        :preflight,
+        :app,
+        :binary,
+        :postflight,
+      ]
+    end
+  end
 end