test/cask/audit_spec: add test for slashes in versions

Library/Homebrew/test/cask/audit_spec.rb

@@ -1011,5 +1011,24 @@ describe Cask::Audit, :cask do
         expect(audit.cask.url.cookies).to eq "foo" => "bar"
       end
     end
+
+    context "when the version contains a slash" do
+      let(:cask_token) { "foo" }
+      let(:cask) do
+        tmp_cask cask_token.to_s, <<~RUBY
+          cask '#{cask_token}' do
+            version '0.1,../../directory/traversal'
+            sha256 '8dd95daa037ac02455435446ec7bc737b34567afe9156af7d20b2a83805c1d8a'
+            url 'https://brew.sh/foo.zip'
+            name 'Audit'
+            desc 'Audit Description'
+            homepage 'https://brew.sh'
+            app 'Audit.app'
+          end
+        RUBY
+      end
+
+      it { is_expected.to fail_with(%r{version should not contain '/'}) }
+    end
   end
 end