QA output created by 157
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728

=== Setting WCE with qdev and with manually created BB ===

Testing: -drive if=none,file=TEST_DIR/t.IMGFMT,driver=IMGFMT,cache=writeback -device virtio-blk,drive=none0
    Cache mode:       writeback
Testing: -drive if=none,file=TEST_DIR/t.IMGFMT,driver=IMGFMT,cache=writeback -device virtio-blk,drive=none0,write-cache=auto
    Cache mode:       writeback
Testing: -drive if=none,file=TEST_DIR/t.IMGFMT,driver=IMGFMT,cache=writeback -device virtio-blk,drive=none0,write-cache=on
    Cache mode:       writeback
Testing: -drive if=none,file=TEST_DIR/t.IMGFMT,driver=IMGFMT,cache=writeback -device virtio-blk,drive=none0,write-cache=off
    Cache mode:       writethrough
Testing: -drive if=none,file=TEST_DIR/t.IMGFMT,driver=IMGFMT,cache=writethrough -device virtio-blk,drive=none0
    Cache mode:       writethrough
Testing: -drive if=none,file=TEST_DIR/t.IMGFMT,driver=IMGFMT,cache=writethrough -device virtio-blk,drive=none0,write-cache=auto
    Cache mode:       writethrough
Testing: -drive if=none,file=TEST_DIR/t.IMGFMT,driver=IMGFMT,cache=writethrough -device virtio-blk,drive=none0,write-cache=on
    Cache mode:       writeback
Testing: -drive if=none,file=TEST_DIR/t.IMGFMT,driver=IMGFMT,cache=writethrough -device virtio-blk,drive=none0,write-cache=off
    Cache mode:       writethrough
*** done