Ubuntu 16.04 -> 18.04 => one unittest failure

Hi,

Since I migrated my PC from Ubuntu 16.04 to Ubuntu 18.04 (both 64 bits), 
I get a unit test failure each time I build LO 6.1.1 and the master.

The end of the error message is the following:

> testN757910::Import_Export_Import finished in: 83ms
> swmodeltestbase.hxx:453:Assertion
> Test name: testTableKeep::Import_Export_Import
> equality assertion failed
> - Expected: 1
> - Actual  : 0
> - xpath should match exactly 1 node
>
> Failures !!!
> Run: 136   Failure total: 1   Failures: 1   Errors: 0
>
> Error: a unit test failed, please do one of:
>
> make CppunitTest_sw_ww8export CPPUNITTRACE="gdb --args"
>     # for interactive debugging on Linux
> make CppunitTest_sw_ww8export VALGRIND=memcheck
>     # for memory checking
> make CppunitTest_sw_ww8export DEBUGCPPUNIT=TRUE
>     # for exception catching
>
> You can limit the execution to just one particular test by:
>
> make CPPUNIT_TEST_NAME="testXYZ" ...above mentioned params...
>
> /home/libo/60/solenv/gbuild/CppunitTest.mk:114: recipe for target 
> '/home/libo/60/workdir/CppunitTest/sw_ww8export.test' failed
> make[1]: *** [/home/libo/60/workdir/CppunitTest/sw_ww8export.test] Error 1
> make[1]: *** Attente des tâches non terminées....
> Makefile:286: recipe for target 'build' failed
> make: *** [build] Error 2

This test passed without problem under Ubuntu 16.04. My autogen.input 
file is the same under Ubuntu 18.04 as it was under Ubuntu 16.04. 
Compiler version is the same (gcc 7.3.0).

I tried make CppunitTest_sw_ww8export CPPUNITTRACE="gdb --args" and did 
see anything relevant: the code run normally, it only don't return the 
expected result.

The other two suggestions do not seem relevant  to me in this case.

What could I do to fix this issue ?

Best regards.

JBF

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