Fix tab info test

Library/Homebrew/test/cask/info_spec.rb

@@ -122,29 +122,36 @@ RSpec.describe Cask::Info, :cask do
     EOS
   end
 
-  it "prints install information for an installed Cask" do
-    cask = Cask::CaskLoader.load("local-transmission")
-    time = 1_720_189_863
-    tab = Cask::Tab.new(loaded_from_api: true, tabfile: TEST_FIXTURE_DIR/"cask_receipt.json", time:)
-    expect(cask).to receive(:installed?).and_return(true)
-    expect(cask).to receive(:installed_version).and_return("2.61")
-    expect(Cask::Tab).to receive(:for_cask).with(cask).and_return(tab)
+  context "when a Cask is installed" do
+    it "prints install information from tab" do
+      mktmpdir do |caskroom|
+        FileUtils.mkdir caskroom/"2.61"
 
-    expect do
-      described_class.info(cask)
-    end.to output(<<~EOS).to_stdout
-      ==> local-transmission: 2.61
-      https://transmissionbt.com/
-      Installed
-      #{HOMEBREW_PREFIX}/Caskroom/local-transmission/2.61 (does not exist)
-        Installed using the formulae.brew.sh API on #{Time.at(time).strftime("%Y-%m-%d at %H:%M:%S")}
-      From: https://github.com/Homebrew/homebrew-cask/blob/HEAD/Casks/l/local-transmission.rb
-      ==> Name
-      Transmission
-      ==> Description
-      BitTorrent client
-      ==> Artifacts
-      Transmission.app (App)
-    EOS
+        cask = Cask::CaskLoader.load("local-transmission")
+        time = 1_720_189_863
+        tab = Cask::Tab.new(loaded_from_api: true, tabfile: TEST_FIXTURE_DIR/"cask_receipt.json", time:)
+        expect(cask).to receive(:installed?).and_return(true)
+        expect(cask).to receive(:caskroom_path).and_return(caskroom)
+        expect(cask).to receive(:installed_version).and_return("2.61")
+        expect(Cask::Tab).to receive(:for_cask).with(cask).and_return(tab)
+
+        expect do
+          described_class.info(cask)
+        end.to output(<<~EOS).to_stdout
+          ==> local-transmission: 2.61
+          https://transmissionbt.com/
+          Installed
+          #{caskroom}/2.61 (0B)
+            Installed using the formulae.brew.sh API on #{Time.at(time).strftime("%Y-%m-%d at %H:%M:%S")}
+          From: https://github.com/Homebrew/homebrew-cask/blob/HEAD/Casks/l/local-transmission.rb
+          ==> Name
+          Transmission
+          ==> Description
+          BitTorrent client
+          ==> Artifacts
+          Transmission.app (App)
+        EOS
+      end
+    end
   end
 end