This is interesting.
When my local system I ran make check command, from 386 total tests is 210 tests passed if I exported with LOUIS_TABLEPATH environment value with /usr/src/liblouis/tables.
The online check results I see 5 failed test the test-suite.log file.
My local test-suite.log part result is following (I not installed yet entire Liblouis 3.28.0 release my distribution, because tomorrow I need doing a fresh package):

================================================
   liblouisutdml 2.12.0: tests/test-suite.log
================================================

# TOTAL: 386
# PASS:  210
# SKIP:  0
# XFAIL: 176
# FAIL:  0
# XPASS: 0
# ERROR: 0

If I creating tomorrow the fresh package, will be looking what tests are failing.

Attila

Ok, I see now what tests failing In real environment with uses Liblouis 3.28.0 (not only tables, but changed libs with affects perhaps the precedence order).
After upgraded my machine the Liblouis packages the fresh 3.28.0 version, following tests are real failing if I running my local system the make check command the tests directory in Liblouisutdml source tree:

• test_mathml_woluwe/test_080.test,
• test_mathml_woluwe/test_106.test,
• test_mathml_woluwe/test_107.test,
• test_mathml_woluwe/test_113.test,
• test_mathml_woluwe/test_114.test.

@bertfrees, you knowing best the voluve MATH Braille (this tests I think uses ../../lbu_files/wiskunde.sem, nl-unicode.dis,../../lbu_files/wiskunde.ctb,braille-patterns.cti in literaryTexttable, nl-unicode.dis,../../lbu_files/wiskunde.ctb,braille-patterns.cti the mathtextTable preference, nl-unicode.dis,../../lbu_files/wiskunde.ctb,braille-patterns.cti the mathexprTable preference, and en-us-brf.dis,braille-patterns.cti,../../lbu_files/wiskunde_edit.ctb tables the editTable preference in tests/math_voluve/liblouisutdml.ini file.

Since the order of precedence was changed right before the release of Liblouis version 3.28.0, maybe for the base operator code (or something similar, I can't think of the correct Liblouis call request that implemented this change), what is the correct expected for these failed tests .txt value?
Could you check the error list of the failed tests, and maybe if the values of the tests are really wrong according to the new Liblouis version, could you fix them in the corresponding files before we switch the version number? I hope it is not necessary to make corrections in one of the sub-tables of Liblouis in connection with these tests, I will attach the error list. :-(:-(
If so, the only thing I can do at the moment is to temporarily put these tests in xfail state (if this is a feasible way) until the errors in the tests are corrected in the affected subtable of Liblouis.
I really hope that either one of the wiskunde.ctb or wiskunde_edit.ctb tables or the expected.txt files are faulty, and not some of the sub-tables of the new Liblouis version produce malfunctions only in these tests.
Final I founded the pull request with change the rule precedence order, but I am not sure this change produces the failing test results this five math voluve tests:
Liblouis pull request #1481

Attila

failed_tests.txt
I attaching the error list how looks the error list with five failing math volume tests.
If not have better way, we need put xfail state this five tests until not fixing the issue this tests in Liblouisutdml proper table, expected.txt files or Liblouis proper affected subtable files.

Thanks the investigation and error list examination,

Attila

Nice, all checks are passed now.
Following tests I marked xfail into the tests/Makefile.am until lbu_files directory the wiskunde.ctb tables are not actualized the Liblouis 3.28.0 version:

• test_mathml_woluwe/test_080.test,
• test_mathml_woluwe/test_106.test,
• test_mathml_woluwe/test_107.test,
• test_mathml_woluwe/test_113.test,
• test_mathml_woluwe/test_114.test

If acceptable my change, please approve these changes.

Thanks the cooperation,

Attila