strange behaviour of test20.tst

[cdwensley]

This test works fine on its own but following some other test it can throw a strange error:

gap> Test( "tst/test19.tst", rec(compareFunction := "uptowhitespace") );
GBNP test19                         
msecs: 2
true
gap> Test( "tst/test20.tst", rec(compareFunction := "uptowhitespace") );
########> Diff in tst/test20.tst:76 
# Input is:
PrintNPList(modrelsNP);
# Expected output:
[ b - 1 , 0]
[ 0, b - 1 ]
[ ab + a^2 + a + 1 , - ab - a^2 - a - 1 ]
# But found:
[ b - 1 ]
[ 0, b - 1 ]
[ ab + a^2 + a + 1 , - ab - a^2 - a - 1 ]
########
GBNP test20
msecs: 5
false
gap> Test( "tst/test20.tst", rec(compareFunction := "uptowhitespace") );
GBNP test20                         
msecs: 4
true