diff --git a/Library/Homebrew/cask/spec/cask/artifact/pkg_spec.rb b/Library/Homebrew/cask/spec/cask/artifact/pkg_spec.rb
new file mode 100644
index 0000000000..d4d69ea663
--- /dev/null
+++ b/Library/Homebrew/cask/spec/cask/artifact/pkg_spec.rb
@@ -0,0 +1,71 @@
+require "spec_helper"
+
+describe Hbc::Artifact::Pkg do
+  let(:cask) { Hbc::CaskLoader.load_from_file(TEST_FIXTURE_DIR/"cask/Casks/with-installable.rb") }
+  let(:fake_system_command) { class_double(Hbc::SystemCommand) }
+
+  before(:each) do
+    shutup do
+      InstallHelper.install_without_artifacts(cask)
+    end
+  end
+
+  describe "install_phase" do
+    it "runs the system installer on the specified pkgs" do
+      pkg = Hbc::Artifact::Pkg.new(cask, command: fake_system_command)
+
+      expect(fake_system_command).to receive(:run!).with(
+        "/usr/sbin/installer",
+        args: ["-pkg", cask.staged_path.join("MyFancyPkg", "Fancy.pkg"), "-target", "/"],
+        sudo: true,
+        print_stdout: true
+      )
+
+      shutup do
+        pkg.install_phase
+      end
+    end
+  end
+
+  describe "choices" 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 = Hbc::Artifact::Pkg.new(cask, command: fake_system_command)
+
+      file = double(path: Pathname.new("/tmp/choices.xml"))
+
+      expect(file).to receive(:write).with(<<-EOS.undent)
+        <?xml version="1.0" encoding="UTF-8"?>
+        <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+        <plist version="1.0">
+        <array>
+        \t<dict>
+        \t\t<key>attributeSetting</key>
+        \t\t<integer>1</integer>
+        \t\t<key>choiceAttribute</key>
+        \t\t<string>selected</string>
+        \t\t<key>choiceIdentifier</key>
+        \t\t<string>choice1</string>
+        \t</dict>
+        </array>
+        </plist>
+      EOS
+
+      expect(file).to receive(:close)
+      expect(file).to receive(:unlink)
+      expect(Tempfile).to receive(:open).and_yield(file)
+
+      expect(fake_system_command).to receive(:run!).with(
+        "/usr/sbin/installer",
+        args: ["-pkg", cask.staged_path.join("MyFancyPkg", "Fancy.pkg"), "-target", "/", "-applyChoiceChangesXML", cask.staged_path.join("/tmp/choices.xml")],
+        sudo: true,
+        print_stdout: true
+      )
+
+      shutup do
+        pkg.install_phase
+      end
+    end
+  end
+end
diff --git a/Library/Homebrew/cask/test/cask/artifact/pkg_test.rb b/Library/Homebrew/cask/test/cask/artifact/pkg_test.rb
deleted file mode 100644
index b054290ce3..0000000000
--- a/Library/Homebrew/cask/test/cask/artifact/pkg_test.rb
+++ /dev/null
@@ -1,64 +0,0 @@
-require "test_helper"
-
-describe Hbc::Artifact::Pkg do
-  before do
-    @cask = Hbc::CaskLoader.load_from_file(TEST_FIXTURE_DIR/"cask/Casks/with-installable.rb")
-    shutup do
-      TestHelper.install_without_artifacts(@cask)
-    end
-  end
-
-  describe "install_phase" do
-    it "runs the system installer on the specified pkgs" do
-      pkg = Hbc::Artifact::Pkg.new(@cask,
-                                   command: Hbc::FakeSystemCommand)
-
-      Hbc::FakeSystemCommand.expects_command(["/usr/bin/sudo", "-E", "--", "/usr/sbin/installer", "-pkg", @cask.staged_path.join("MyFancyPkg", "Fancy.pkg"), "-target", "/"])
-
-      shutup do
-        pkg.install_phase
-      end
-    end
-  end
-
-  describe "choices" do
-    before do
-      @cask = Hbc::CaskLoader.load_from_file(TEST_FIXTURE_DIR/"cask/Casks/with-choices.rb")
-      shutup do
-        TestHelper.install_without_artifacts(@cask)
-      end
-    end
-
-    it "passes the choice changes xml to the system installer" do
-      pkg = Hbc::Artifact::Pkg.new(@cask, command: Hbc::FakeSystemCommand)
-
-      file = mock
-      file.expects(:write).with <<-EOS.undent
-        <?xml version="1.0" encoding="UTF-8"?>
-        <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-        <plist version="1.0">
-        <array>
-        \t<dict>
-        \t\t<key>attributeSetting</key>
-        \t\t<integer>1</integer>
-        \t\t<key>choiceAttribute</key>
-        \t\t<string>selected</string>
-        \t\t<key>choiceIdentifier</key>
-        \t\t<string>choice1</string>
-        \t</dict>
-        </array>
-        </plist>
-      EOS
-      file.stubs path: Pathname.new("/tmp/choices.xml")
-      file.expects(:close)
-      file.expects(:unlink)
-      Tempfile.expects(:open).yields file
-
-      Hbc::FakeSystemCommand.expects_command(["/usr/bin/sudo", "-E", "--", "/usr/sbin/installer", "-pkg", @cask.staged_path.join("MyFancyPkg", "Fancy.pkg"), "-target", "/", "-applyChoiceChangesXML", @cask.staged_path.join("/tmp/choices.xml")])
-
-      shutup do
-        pkg.install_phase
-      end
-    end
-  end
-end