Merge pull request #11326 from MikeMcQuaid/delete-flaky-test

cask/installer_spec: delete flaky test.

Library/Homebrew/test/cask/installer_spec.rb

@@ -25,24 +25,6 @@ describe Cask::Installer, :cask do
       expect(asset.config.appdir.join("container")).to be_a_file
     end
 
-    it "works with APFS dmg-based Casks" do
-      asset = Cask::CaskLoader.load(cask_path("container-apfs-dmg"))
-      diskutil_list_command = "diskutil list | grep '/dev'"
-
-      sleep 5
-      original_diskutil_list = `#{diskutil_list_command}`
-
-      described_class.new(asset).install
-
-      expect(Cask::Caskroom.path.join("container-apfs-dmg", asset.version)).to be_a_directory
-      expect(asset.config.appdir.join("container")).to be_a_file
-
-      sleep 5
-      expect { system diskutil_list_command }
-        .to output(original_diskutil_list)
-        .to_stdout_from_any_process
-    end
-
     it "works with tar-gz-based Casks" do
       asset = Cask::CaskLoader.load(cask_path("container-tar-gz"))