gnucash maint: [test-qofbook] add tests for unknown features

[Christopher Lam]

Updated	 via  https://github.com/Gnucash/gnucash/commit/b87aa004 (commit)
	from  https://github.com/Gnucash/gnucash/commit/b9077bcc (commit)



commit b87aa004f9f70b0025bb475b5fc67b2c28e7e9d2
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Mon Oct 31 10:15:04 2022 +0800

    [test-qofbook] add tests for unknown features
    
    tests that gnc_features_test_unknown returns a suitable error message



Summary of changes:
 libgnucash/engine/test/test-qofbook.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)