Add test to ensure Zap does not have an uninstall_phase.

Library/Homebrew/cask/spec/cask/artifact/uninstall_no_zap_spec.rb

@@ -0,0 +1,21 @@
+require "spec_helper"
+
+describe Hbc::Artifact::Zap do
+  let(:cask) { Hbc::CaskLoader.load_from_file(TEST_FIXTURE_DIR/"cask/Casks/with-installable.rb") }
+
+  let(:zap_artifact) {
+    Hbc::Artifact::Zap.new(cask)
+  }
+
+  before do
+    shutup do
+      InstallHelper.install_without_artifacts(cask)
+    end
+  end
+
+  describe "#uninstall_phase" do
+    subject { zap_artifact }
+
+    it { is_expected.not_to respond_to(:uninstall_phase) }
+  end
+end