qga: test: Add tests for `merged` flag

This commit adds a test to ensure `merged` functions as expected.
We also add a negative test to ensure we haven't regressed previous
functionality.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
Signed-off-by: Konstantin Kostiuk <kkostiuk@redhat.com>
1 file changed