qemu-iotests: Test qemu-img operation on zero size image

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/tests/qemu-iotests/042.out b/tests/qemu-iotests/042.out
new file mode 100644
index 0000000..dc80f4b
--- /dev/null
+++ b/tests/qemu-iotests/042.out
@@ -0,0 +1,15 @@
+QA output created by 042
+
+== Creating zero size image ==
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=0 
+No errors were found on the image.
+
+== Converting the image ==
+No errors were found on the image.
+
+== Converting the image, compressed ==
+No errors were found on the image.
+
+== Rebasing the image ==
+No errors were found on the image.
+*** done