How to check that the file downloaded is extension .zip on the machine where test cafe is running

the following code performs a click on Download button and that action downloads a file on the "client machine". Actualy the "client machine" is a docker - debian image that download chrome and runs test cafe 1.9.2.

public static async DownloadMonitor() {
    await t.click(monitorDetailPageSelector.contextMenu)
    await t.wait(WaitConfig.Waits.second)
    await t.click(monitorDetailPageSelector.downloadButton)
    await t.wait(WaitConfig.Waits.second)
   return true; 
  }

After this test i want to verify that the file downloaded is .zip extension.

Problems that i have

I do not know the download folder on the client machine.