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First, driver=qcow2 will not work so well with non-qcow2 formats (and this test claims to support qcow, qed, and vmdk). Second, vmdk will always report the backing file format to be vmdk. Filter that out so the output looks like for all other formats. Third, the flat vmdk subformats do not support backing files, so they will not work with this test. Signed-off-by: Max Reitz <mreitz@redhat.com> Message-Id: <20191219144243.1763246-1-mreitz@redhat.com> Tested-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>