In this PR on another package:
discos/srt-single-dish-tools#91
I'm getting a failure in Appveyor:

>           os.unlink(dst)
E           PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'C:\\Users\\appveyor\\AppData\\Local\\Temp\\1\\srttools-test-wx27cxl4\\Lib\\site-packages\\dummyfile.fits'

However, dummyfile.fits should not be open. All I/O on that file with astropy.io.fits.open() is through with statements and this call to unlink is in a function called outside of them, so the file should be closed when it gets to that function.
Has anyone gotten the same error?