Sometims, one test case failed. i.e., TrapdoorPermutation Case

[thucgn]

Describe the bug

tests ./ScapiTests

All tests passed (498 assertions in 18 test cases)

tests ./ScapiTests

ScapiTests is a Catch v1.2.1 host application.
Run with -? for options

-------------------------------------------------------------------------------
TrapdoorPermutation
  OpenSSL
-------------------------------------------------------------------------------
/home/gw/install/libscapi-master-dev/tests/tests.cpp:817
...............................................................................

/home/gw/install/libscapi-master-dev/tests/tests.cpp:834: FAILED:
  REQUIRE( re_inv->getElement() == re_src->getElement() )
with expansion:
  0 == 27
with message:
  re_enc->getElement() := 48

===============================================================================
test cases:  18 |  17 passed | 1 failed
assertions: 498 | 497 passed | 1 failed


**Machine details:**
 - ubuntu 18.04
 - gcc 7.5 
- boost 1.71.0

[rscmendes]

Also got this problem with ubuntu 18.04, gcc 7.5 and boost 1.65.1. Thanks for telling "Sometimes", I ended up repeating the build until the test passed.